This document presents a comparative study of denoising 1-D data using wavelet transform. It studies the impact of different levels of decomposition and thresholding criteria (hard or soft) on output signal-to-noise ratio and mean square error when denoising four synthetic signals (blocks, bumps, doppler, heavy sine) corrupted with white noise using discrete wavelet transform. The results show that for blocks and bumps signals, soft thresholding produced higher output SNR and lower mean square error compared to hard thresholding. Higher levels of decomposition also led to better denoising for blocks but not for bumps.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Dwpt Based FFT and Its Application to SNR Estimation in OFDM SystemsCSCJournals
This document discusses a wavelet packet transform based fast Fourier transform (DWPT-FFT) and its application to signal-to-noise ratio (SNR) estimation in orthogonal frequency division multiplexing (OFDM) systems. The DWPT-FFT has the same computational complexity as the conventional FFT but provides finer frequency resolution. An SNR estimation technique is proposed that performs estimation inside the DWPT-FFT block, unlike previous methods that estimate SNR after FFT. The technique divides the OFDM band into sub-bands using wavelet packets and estimates noise power in each sub-band based on the autocorrelation of the transmitted preamble. The proposed estimator is compared to Reddy's estimator through simulations and shows improved performance in colored noise scenarios.
It is a basic ppt of pattern recognition using wavelates and contourlets.... I will describe the algo into next slide... Thank you... It is a good ppt you can learn the basic of this project
This document provides an introduction to wavelet transforms. It begins with an outline of topics to be covered, including an overview of wavelet transforms, the limitations of Fourier transforms, the historical development of wavelets, the principle of wavelet transforms, examples of applications, and references. It then discusses the stationarity of signals and how Fourier transforms cannot show when frequency components occur over time. Short-time Fourier analysis is introduced as a solution, but it is noted that wavelet transforms provide a more flexible approach by allowing the window size to vary. The document proceeds to define what a wavelet is, discuss the historical development of wavelet theory, provide examples of popular mother wavelets, and explain the steps to compute a continuous wave
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Implementation of adaptive stft algorithm for lfm signalseSAT Journals
Abstract
Normally Time-Frequency analysis is done by sliding a window through the time domain data and computing the Fourier
Transform of the data within the window. The choice of the window length determines whether specular or resonant information
will be emphasized. A narrow window will isolate specular reflections but will not be wide enough to accommodate the slowly
varying global resonances; a wide window cannot temporally separate resonance and specular information. So we will adapt
window length according to changes in frequencies. In this case we are realizing the specifications of Linear Frequency
Modulation (LFM) signal.
Index Terms—LFM, FFT, DFT, STFT and ASTFT.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Dwpt Based FFT and Its Application to SNR Estimation in OFDM SystemsCSCJournals
This document discusses a wavelet packet transform based fast Fourier transform (DWPT-FFT) and its application to signal-to-noise ratio (SNR) estimation in orthogonal frequency division multiplexing (OFDM) systems. The DWPT-FFT has the same computational complexity as the conventional FFT but provides finer frequency resolution. An SNR estimation technique is proposed that performs estimation inside the DWPT-FFT block, unlike previous methods that estimate SNR after FFT. The technique divides the OFDM band into sub-bands using wavelet packets and estimates noise power in each sub-band based on the autocorrelation of the transmitted preamble. The proposed estimator is compared to Reddy's estimator through simulations and shows improved performance in colored noise scenarios.
It is a basic ppt of pattern recognition using wavelates and contourlets.... I will describe the algo into next slide... Thank you... It is a good ppt you can learn the basic of this project
This document provides an introduction to wavelet transforms. It begins with an outline of topics to be covered, including an overview of wavelet transforms, the limitations of Fourier transforms, the historical development of wavelets, the principle of wavelet transforms, examples of applications, and references. It then discusses the stationarity of signals and how Fourier transforms cannot show when frequency components occur over time. Short-time Fourier analysis is introduced as a solution, but it is noted that wavelet transforms provide a more flexible approach by allowing the window size to vary. The document proceeds to define what a wavelet is, discuss the historical development of wavelet theory, provide examples of popular mother wavelets, and explain the steps to compute a continuous wave
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Implementation of adaptive stft algorithm for lfm signalseSAT Journals
Abstract
Normally Time-Frequency analysis is done by sliding a window through the time domain data and computing the Fourier
Transform of the data within the window. The choice of the window length determines whether specular or resonant information
will be emphasized. A narrow window will isolate specular reflections but will not be wide enough to accommodate the slowly
varying global resonances; a wide window cannot temporally separate resonance and specular information. So we will adapt
window length according to changes in frequencies. In this case we are realizing the specifications of Linear Frequency
Modulation (LFM) signal.
Index Terms—LFM, FFT, DFT, STFT and ASTFT.
This document describes a method for generating entangled photon pairs using picosecond soliton pulses trapped in microring resonators (MRRs). Spatial and temporal soliton pulses with peak powers of 500-550 mW are input into a system of three MRRs. The soliton pulses generate a broad spectrum of chaotic signals within the MRRs due to nonlinear effects. Ultra-short soliton pulses of 25 ps can be trapped within a frequency of 3.52 GHz. The entangled photon pairs generated are then transmitted to users via a wireless router system, allowing secure optical communication via quantum keys distributed over a network.
The document discusses denoising signals using wavelet transforms. It begins with an overview of denoising and its goal of reconstructing a signal from a noisy one. It then compares denoising using wavelets to other methods like Fourier filtering and spline methods. The key advantages of wavelets are their ability to localize properties and concentrate a signal's energy. The document outlines the basic denoising process using wavelet transforms which involves decomposition, thresholding, and reconstruction. It also discusses different thresholding methods and commonly used thresholds like VisuShrink.
Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...University of Malaya (UM)
This document describes a system that can generate nanometer optical tweezers for use in optical communication networks. The system involves propagating dark solitons inside a nonlinear microring resonator (MRR). By controlling parameters like input power, the system can produce optical tweezers with full widths at half maximum as small as 9 nm. These ultra-short nanometer optical tweezers could improve data capacity in communication networks. The document also discusses using such a system along with a wavelength router for applications like quantum cryptography and secure optical communication.
Spectrum Sensing Detection with Sequential Forward Search in Comparison to Kn...IJMTST Journal
FCC is currently working on the concept of white space users “borrowing” spectrum from free license
holders temporarily to improve the spectrum utilization.
This project provides a relation between a Pf and the SNR value of any spectrum detector to have a
certain performance. Previous spectrum sensing detection techniques are only suitable for Low SNR and
are based on signal information values. But these methods are purely narrow band spectrum applications
In order to overcome the above said drawbacks we propose a novel method of spectrum sensing method
and is suitable for low and high SNR values, the sensed spectrum applicable for wide band applications.
Our proposed method does not require signal information at the receiver and channel information, because
this flexibility sensing rate is very high compared to previous techniques.
This document provides an overview of wavelet transformation and discrete wavelet transform (DWT). It discusses working with wavelets by convolving signals with wavelet filters and storing the results in coefficients. Properties of wavelets include maximum frequency depending on signal length and recursive partitioning of lowest band. DWT requires an orthonormal wavelet basis and uses scaling functions and wavelets. 2D wavelet transform uses separable transforms with low and high pass filters in each direction. Experimental results show decompositions of images at different levels.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses image analysis using wavelet transformation. It provides an overview of digital image processing and compares Fourier transforms, short-term Fourier transforms, and wavelet transforms. Wavelet transforms provide better time-frequency localization than Fourier transforms. The document demonstrates Haar wavelets and how they can be used to decompose an image into different frequency subbands. It discusses applications of wavelet transforms such as image compression, denoising, and feature extraction. The document includes MATLAB code for performing wavelet decomposition on an image.
This document summarizes the technical details of Sage's 23-tone test for characterizing communication channels. It defines the 8 measurements made by the test: composite power, attenuation distortion, envelop-delay distortion (EDD), second-order intermodulation distortion (IMD2), third-order intermodulation distortion (IMD3), signal-to-noise ratio (SNR), signal-to-total distortion (STD), and channel capacity. It then provides typical measurement values seen on clean analog circuits, clean digital (PCM) channels, and hybrid analog-digital connections. The document aims to help test engineers and developers understand and interpret the 23-tone test results.
A seminar on INTRODUCTION TO MULTI-RESOLUTION AND WAVELET TRANSFORMमनीष राठौर
This document provides an introduction to multi-resolution analysis and wavelet transforms. It discusses that multi-resolution analysis analyzes signals at varying levels of detail or resolutions simultaneously. The Fourier transform has limitations for non-stationary signals as it does not provide time information. The short-term Fourier transform was developed to analyze non-stationary signals, but it has limitations in time-frequency resolution. Wavelet transforms were developed to analyze signals using variable time-frequency resolutions. Wavelet transforms have features like varying time-frequency resolutions and are suitable for analyzing non-stationary signals. They have applications in fields like signal compression, noise removal, and image processing.
Long distance communication using localized optical soliton via entangled photonUniversity of Malaya (UM)
This document summarizes research on using localized optical solitons generated by microring resonators for long distance communication via entangled photons. A system of microring resonators is presented that can generate broadband spectra through temporal and spatial soliton pulses trapped within the rings. Simulations show localized solitons with femtosecond and picosecond widths can be generated. The soliton pulses could then be used to implement continuous-variable quantum key distribution over long distances by encoding entangled photon pairs across different time slots. This research proposes a way to securely transmit information for communication networks using nonlinear photonics and quantum optics techniques.
Wavelet packets provide an adaptive decomposition that overcomes limitations of the discrete wavelet transform (DWT). In wavelet packets, signal decomposition using high-pass and low-pass filters is applied recursively to both low-pass and high-pass outputs, allowing more flexible time-frequency analysis. This results in a redundant dictionary with increased flexibility but also higher computational costs. Pruning algorithms are used to select an optimal subset of bases for a given application based on cost functions related to properties like sparsity, entropy, or energy concentration.
Speech Processing in Stressing Co-Channel Interference Using the Wigner Distr...CSCJournals
The Fractional Fourier Transform (FrFT) can provide significant interference suppression (IS) over other techniques in real-life non-stationary environments because it can operate with very few samples. However, the optimum rotational parameter ‘a’ must first be estimated. Recently, a new method to estimate ‘a’ based on the value that minimizes the projection of the product of the Wigner Distributions (WDs) of the signal-of-interest (SOI) and interference was proposed. This is more easily calculated by recognizing its equivalency to choosing ‘a’ for which the product of the energies of the SOI and interference in the FrFT domain is minimized, termed the WD-FrFT algorithm. The algorithm was shown to estimate ‘a’ more accurately than minimum mean square error FrFT (MMSE-FrFT) methods and perform far better than MMSE Fast Fourier Transform (MMSE-FFT) methods, which only operate in the frequency domain. The WD-FrFT algorithm significantly improves interference suppression (IS) capability, even at low signal-to-noise ratio (SNR). In this paper, we apply the proposed WD-FrFT technique to recovering a speech signal in non-stationary co-channel interference. Using mean-square error (MSE) between the SOI and its estimate as the performance metric, we show that the technique greatly outperforms the conventional methods, MMSE-FrFT and MMSE-FFT, which fail with just one non-stationary interferer, and continues to perform well in the presence of severe co-channel interference (CCI) consisting of multiple, equal power, non-stationary interferers. This method therefore has great potential for separating co-channel signals in harsh, noisy, non-stationary environments.
The document discusses performing a discrete wavelet transform (DWT) on a 1D signal using MATLAB. It loads a test signal, performs a 5-level DWT decomposition using the coif3 wavelet, then reconstructs the approximation and detail signals at each level. Plots of the original, approximation, and detail signals are generated.
OFFLINE SPIKE DETECTION USING TIME DEPENDENT ENTROPY ijbesjournal
This document describes an offline spike detection method using time-dependent entropy (TDE). TDE tracks changes in the entropy content of overlapping windows of neural data, as spikes are transient events that affect the signal's entropy. The method was tested on synthesized neural data containing embedded spike trains at various signal-to-noise ratios. Results showed TDE enabled detection of spikes with relatively lower false alarm rates compared to other methods. Key parameters for TDE include the window length, sliding lag, and entropy index value, which were optimized for spike detection performance.
Performance analysis of wavelet based blind detection and hop time estimation...Saira Shahid
This document discusses a wavelet-based algorithm for blind detection and hop time estimation of frequency hopping signals in the HF band.
The algorithm first uses the temporal correlation function (TCF) of the received signal to extract phase information. Discrete wavelet transform (DWT) is then applied to the TCF to detect frequency transition points, which indicate the time of hopping between frequencies. Simulation results showing the detection performance at different signal-to-noise ratios are presented.
The key steps are: 1) Extracting the phase from the TCF of the received signal. 2) Applying DWT as a de-noising technique to detect the times of hopping between frequencies. 3) Presenting simulation
This document proposes using the discrete wavelet transform (DWT) with truncation for privacy-preserving data mining. The DWT decomposes data into approximation and detail coefficients. Truncating the detail coefficients distorts the data while maintaining statistical properties. An experiment shows the method effectively conceals sensitive information while preserving data mining performance after distortion.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Removal of Clutter by Using Wavelet Transform For Wind ProfilerIJMER
ABSTRACT: Removal of clutter in the radar wind profiler
is the utmost important consideration in radar. Wavelet
transform is very effective method to remove the clutter.
This paper presents a technique based on the wavelet
transform to remove the clutter. In this technique we used
Fourier transform and descrete wavelet transform after
that applied inverse discrete wavelet transform for signal.
These techniques applied for inphase and quadrature
phase, total spectrum and single range gate. Very
encouraging results got with this technique that have
shown practical possibilities for a real time
implementation and for applications related to frequency
domain.
Keywords: Wind profiler, wavelet transform, Fourier transform, clutter, signal processing
Wavelet transform and its applications in data analysis and signal and image ...Sourjya Dutta
This document provides an introduction to wavelet transforms and their applications in data analysis, signal processing, and image processing. It discusses how wavelet transforms overcome limitations of Fourier transforms by using localized basis functions. Applications mentioned include decomposing signals into different frequency components over time and removing noise from data. Examples are provided to illustrate wavelet decomposition and denoising.
This document discusses techniques for identifying abnormal vehicle behavior in traffic videos. It begins with an abstract that outlines the goal of detecting abnormal vehicles to improve traffic safety. The introduction then provides context on video surveillance systems and their use in traffic monitoring. The document goes on to discuss specific techniques for object detection, tracking, and classification that can be used to analyze vehicle behavior and identify abnormalities. These include background subtraction, hierarchical background modeling, and classification using features like size and motion. Hidden Markov Models, neural networks, and clustering approaches are also mentioned for modeling vehicle motion and detecting anomalous events.
This document discusses a case and document management software system designed for law firms. It aims to bring together traditional legal work methods with modern technology.
The document first provides background on the important role of documents in legal cases and the need for efficient document management. It then describes the proposed system's features, including legal calendars, document searching and data mining capabilities. Algorithms for document ranking and association pattern mining in customer data are also presented.
The system is analyzed in terms of its potential to improve efficiency for lawyers and law firms by automating routine tasks. It is concluded that the system successfully combines new technology with traditional work styles. Future work may involve developing a mobile app version for increased accessibility.
The document compares the performance of single stage and double stage interleavers in communication systems using turbo codes. A single stage interleaver uses one random interleaver between two convolutional encoders, while a double stage interleaver uses two interleavers in series. The document suggests that a double stage interleaver can improve the bit error rate (BER) of the system compared to a single stage interleaver by further scrambling the input bits. It also provides details on the components of a turbo code system such as convolutional encoders, interleavers, puncturing, and iterative decoding.
This document describes a method for generating entangled photon pairs using picosecond soliton pulses trapped in microring resonators (MRRs). Spatial and temporal soliton pulses with peak powers of 500-550 mW are input into a system of three MRRs. The soliton pulses generate a broad spectrum of chaotic signals within the MRRs due to nonlinear effects. Ultra-short soliton pulses of 25 ps can be trapped within a frequency of 3.52 GHz. The entangled photon pairs generated are then transmitted to users via a wireless router system, allowing secure optical communication via quantum keys distributed over a network.
The document discusses denoising signals using wavelet transforms. It begins with an overview of denoising and its goal of reconstructing a signal from a noisy one. It then compares denoising using wavelets to other methods like Fourier filtering and spline methods. The key advantages of wavelets are their ability to localize properties and concentrate a signal's energy. The document outlines the basic denoising process using wavelet transforms which involves decomposition, thresholding, and reconstruction. It also discusses different thresholding methods and commonly used thresholds like VisuShrink.
Generation of Nanometer Optical Tweezers Used for Optical Communication Netw...University of Malaya (UM)
This document describes a system that can generate nanometer optical tweezers for use in optical communication networks. The system involves propagating dark solitons inside a nonlinear microring resonator (MRR). By controlling parameters like input power, the system can produce optical tweezers with full widths at half maximum as small as 9 nm. These ultra-short nanometer optical tweezers could improve data capacity in communication networks. The document also discusses using such a system along with a wavelength router for applications like quantum cryptography and secure optical communication.
Spectrum Sensing Detection with Sequential Forward Search in Comparison to Kn...IJMTST Journal
FCC is currently working on the concept of white space users “borrowing” spectrum from free license
holders temporarily to improve the spectrum utilization.
This project provides a relation between a Pf and the SNR value of any spectrum detector to have a
certain performance. Previous spectrum sensing detection techniques are only suitable for Low SNR and
are based on signal information values. But these methods are purely narrow band spectrum applications
In order to overcome the above said drawbacks we propose a novel method of spectrum sensing method
and is suitable for low and high SNR values, the sensed spectrum applicable for wide band applications.
Our proposed method does not require signal information at the receiver and channel information, because
this flexibility sensing rate is very high compared to previous techniques.
This document provides an overview of wavelet transformation and discrete wavelet transform (DWT). It discusses working with wavelets by convolving signals with wavelet filters and storing the results in coefficients. Properties of wavelets include maximum frequency depending on signal length and recursive partitioning of lowest band. DWT requires an orthonormal wavelet basis and uses scaling functions and wavelets. 2D wavelet transform uses separable transforms with low and high pass filters in each direction. Experimental results show decompositions of images at different levels.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses image analysis using wavelet transformation. It provides an overview of digital image processing and compares Fourier transforms, short-term Fourier transforms, and wavelet transforms. Wavelet transforms provide better time-frequency localization than Fourier transforms. The document demonstrates Haar wavelets and how they can be used to decompose an image into different frequency subbands. It discusses applications of wavelet transforms such as image compression, denoising, and feature extraction. The document includes MATLAB code for performing wavelet decomposition on an image.
This document summarizes the technical details of Sage's 23-tone test for characterizing communication channels. It defines the 8 measurements made by the test: composite power, attenuation distortion, envelop-delay distortion (EDD), second-order intermodulation distortion (IMD2), third-order intermodulation distortion (IMD3), signal-to-noise ratio (SNR), signal-to-total distortion (STD), and channel capacity. It then provides typical measurement values seen on clean analog circuits, clean digital (PCM) channels, and hybrid analog-digital connections. The document aims to help test engineers and developers understand and interpret the 23-tone test results.
A seminar on INTRODUCTION TO MULTI-RESOLUTION AND WAVELET TRANSFORMमनीष राठौर
This document provides an introduction to multi-resolution analysis and wavelet transforms. It discusses that multi-resolution analysis analyzes signals at varying levels of detail or resolutions simultaneously. The Fourier transform has limitations for non-stationary signals as it does not provide time information. The short-term Fourier transform was developed to analyze non-stationary signals, but it has limitations in time-frequency resolution. Wavelet transforms were developed to analyze signals using variable time-frequency resolutions. Wavelet transforms have features like varying time-frequency resolutions and are suitable for analyzing non-stationary signals. They have applications in fields like signal compression, noise removal, and image processing.
Long distance communication using localized optical soliton via entangled photonUniversity of Malaya (UM)
This document summarizes research on using localized optical solitons generated by microring resonators for long distance communication via entangled photons. A system of microring resonators is presented that can generate broadband spectra through temporal and spatial soliton pulses trapped within the rings. Simulations show localized solitons with femtosecond and picosecond widths can be generated. The soliton pulses could then be used to implement continuous-variable quantum key distribution over long distances by encoding entangled photon pairs across different time slots. This research proposes a way to securely transmit information for communication networks using nonlinear photonics and quantum optics techniques.
Wavelet packets provide an adaptive decomposition that overcomes limitations of the discrete wavelet transform (DWT). In wavelet packets, signal decomposition using high-pass and low-pass filters is applied recursively to both low-pass and high-pass outputs, allowing more flexible time-frequency analysis. This results in a redundant dictionary with increased flexibility but also higher computational costs. Pruning algorithms are used to select an optimal subset of bases for a given application based on cost functions related to properties like sparsity, entropy, or energy concentration.
Speech Processing in Stressing Co-Channel Interference Using the Wigner Distr...CSCJournals
The Fractional Fourier Transform (FrFT) can provide significant interference suppression (IS) over other techniques in real-life non-stationary environments because it can operate with very few samples. However, the optimum rotational parameter ‘a’ must first be estimated. Recently, a new method to estimate ‘a’ based on the value that minimizes the projection of the product of the Wigner Distributions (WDs) of the signal-of-interest (SOI) and interference was proposed. This is more easily calculated by recognizing its equivalency to choosing ‘a’ for which the product of the energies of the SOI and interference in the FrFT domain is minimized, termed the WD-FrFT algorithm. The algorithm was shown to estimate ‘a’ more accurately than minimum mean square error FrFT (MMSE-FrFT) methods and perform far better than MMSE Fast Fourier Transform (MMSE-FFT) methods, which only operate in the frequency domain. The WD-FrFT algorithm significantly improves interference suppression (IS) capability, even at low signal-to-noise ratio (SNR). In this paper, we apply the proposed WD-FrFT technique to recovering a speech signal in non-stationary co-channel interference. Using mean-square error (MSE) between the SOI and its estimate as the performance metric, we show that the technique greatly outperforms the conventional methods, MMSE-FrFT and MMSE-FFT, which fail with just one non-stationary interferer, and continues to perform well in the presence of severe co-channel interference (CCI) consisting of multiple, equal power, non-stationary interferers. This method therefore has great potential for separating co-channel signals in harsh, noisy, non-stationary environments.
The document discusses performing a discrete wavelet transform (DWT) on a 1D signal using MATLAB. It loads a test signal, performs a 5-level DWT decomposition using the coif3 wavelet, then reconstructs the approximation and detail signals at each level. Plots of the original, approximation, and detail signals are generated.
OFFLINE SPIKE DETECTION USING TIME DEPENDENT ENTROPY ijbesjournal
This document describes an offline spike detection method using time-dependent entropy (TDE). TDE tracks changes in the entropy content of overlapping windows of neural data, as spikes are transient events that affect the signal's entropy. The method was tested on synthesized neural data containing embedded spike trains at various signal-to-noise ratios. Results showed TDE enabled detection of spikes with relatively lower false alarm rates compared to other methods. Key parameters for TDE include the window length, sliding lag, and entropy index value, which were optimized for spike detection performance.
Performance analysis of wavelet based blind detection and hop time estimation...Saira Shahid
This document discusses a wavelet-based algorithm for blind detection and hop time estimation of frequency hopping signals in the HF band.
The algorithm first uses the temporal correlation function (TCF) of the received signal to extract phase information. Discrete wavelet transform (DWT) is then applied to the TCF to detect frequency transition points, which indicate the time of hopping between frequencies. Simulation results showing the detection performance at different signal-to-noise ratios are presented.
The key steps are: 1) Extracting the phase from the TCF of the received signal. 2) Applying DWT as a de-noising technique to detect the times of hopping between frequencies. 3) Presenting simulation
This document proposes using the discrete wavelet transform (DWT) with truncation for privacy-preserving data mining. The DWT decomposes data into approximation and detail coefficients. Truncating the detail coefficients distorts the data while maintaining statistical properties. An experiment shows the method effectively conceals sensitive information while preserving data mining performance after distortion.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Removal of Clutter by Using Wavelet Transform For Wind ProfilerIJMER
ABSTRACT: Removal of clutter in the radar wind profiler
is the utmost important consideration in radar. Wavelet
transform is very effective method to remove the clutter.
This paper presents a technique based on the wavelet
transform to remove the clutter. In this technique we used
Fourier transform and descrete wavelet transform after
that applied inverse discrete wavelet transform for signal.
These techniques applied for inphase and quadrature
phase, total spectrum and single range gate. Very
encouraging results got with this technique that have
shown practical possibilities for a real time
implementation and for applications related to frequency
domain.
Keywords: Wind profiler, wavelet transform, Fourier transform, clutter, signal processing
Wavelet transform and its applications in data analysis and signal and image ...Sourjya Dutta
This document provides an introduction to wavelet transforms and their applications in data analysis, signal processing, and image processing. It discusses how wavelet transforms overcome limitations of Fourier transforms by using localized basis functions. Applications mentioned include decomposing signals into different frequency components over time and removing noise from data. Examples are provided to illustrate wavelet decomposition and denoising.
This document discusses techniques for identifying abnormal vehicle behavior in traffic videos. It begins with an abstract that outlines the goal of detecting abnormal vehicles to improve traffic safety. The introduction then provides context on video surveillance systems and their use in traffic monitoring. The document goes on to discuss specific techniques for object detection, tracking, and classification that can be used to analyze vehicle behavior and identify abnormalities. These include background subtraction, hierarchical background modeling, and classification using features like size and motion. Hidden Markov Models, neural networks, and clustering approaches are also mentioned for modeling vehicle motion and detecting anomalous events.
This document discusses a case and document management software system designed for law firms. It aims to bring together traditional legal work methods with modern technology.
The document first provides background on the important role of documents in legal cases and the need for efficient document management. It then describes the proposed system's features, including legal calendars, document searching and data mining capabilities. Algorithms for document ranking and association pattern mining in customer data are also presented.
The system is analyzed in terms of its potential to improve efficiency for lawyers and law firms by automating routine tasks. It is concluded that the system successfully combines new technology with traditional work styles. Future work may involve developing a mobile app version for increased accessibility.
The document compares the performance of single stage and double stage interleavers in communication systems using turbo codes. A single stage interleaver uses one random interleaver between two convolutional encoders, while a double stage interleaver uses two interleavers in series. The document suggests that a double stage interleaver can improve the bit error rate (BER) of the system compared to a single stage interleaver by further scrambling the input bits. It also provides details on the components of a turbo code system such as convolutional encoders, interleavers, puncturing, and iterative decoding.
This document analyzes the seismic and wind effects on steel silo supporting structures. It compares a braced frame structure to an unbraced frame structure. Dynamic analysis was performed using equivalent static and response spectrum methods for earthquake zone V according to Indian codes. The braced system had a higher fundamental natural period and higher base shear values compared to the unbraced system, indicating it provided greater stiffness. The braced system also had lower lateral displacements, showing it performed better under dynamic loading. Overall, the analysis found the braced system to be more economical and effective at resisting seismic and wind loads compared to the unbraced alternative.
This document summarizes a study that evaluated the design of an automobile connecting rod using finite element analysis to optimize it for high cycle fatigue strength. The study developed a 3D model of a connecting rod, analyzed stresses under different loading conditions using FEA software, and identified areas of high stress concentration. Six different load cases were considered for the analysis, including bolt preload, inertial forces at various engine speeds, and combined gas and inertial forces. The maximum and minimum bolt preloads were identified as critical parameters for the high cycle fatigue analysis. The study aimed to establish a systematic procedure to evaluate and optimize connecting rod design for fatigue life using finite element modeling.
This document discusses the design and optimization of a steel structure for supporting solar electrical panels. It begins by introducing steel structures and their advantages. It then discusses the existing traditional design process used by manufacturers, which tends to result in overdesigned and heavy structures without using analytical methods. The goal of the project is to introduce finite element analysis to provide a more optimized design that is lighter, lower cost and meets load requirements. Various steel sections will be analyzed and compared in ANSYS to determine the most effective cross section. The analysis will look at deflection, weight and cost to identify a design that maximizes stiffness while minimizing materials usage and expenses. The expected results are an optimized structural design for supporting electrical control panels that uses less material and reduces
This document provides an overview of knowledge management. It discusses how knowledge management is a cross-disciplinary domain that involves managing an organization's knowledge through systematic sharing and creation of knowledge. The general knowledge model outlines the key processes of knowledge creation, retention, transfer, and utilization. Knowledge management techniques help organizations explicate tacit knowledge and share it to gain competitive advantages.
This document describes a proposed VLSI implementation of a high-speed DCT architecture for H.264 video codec design. It presents a Booth radix-8 multiplier-based multiply-accumulate (MAC) unit to improve throughput and minimize area complexity for 8x8 2D DCT computation. The proposed MAC architecture achieves a maximum operating frequency of 129.18MHz while reducing area by 64% compared to a regular merged MAC unit with a conventional multiplier. FPGA implementation and performance analysis demonstrate the suitability of the proposed DCT architecture for applications in HDTV systems.
This document summarizes an article from the International Journal of Research in Advent Technology that proposes an enhanced automatic license plate recognition system. The system aims to overcome issues with existing ALPR techniques like uneven illumination and poor image quality. It develops an ALPR system with four main stages: image acquisition, license plate extraction, license plate segmentation, and character recognition. A key contribution is a methodology to enhance images by eliminating illumination issues before processing, which improves accuracy. The document reviews related literature on existing ALPR techniques and compares their advantages and disadvantages. It then describes the proposed system and experimental results demonstrating its effectiveness at license plate recognition.
This document summarizes various methods used to remove metal artifacts from dental CT images. It discusses projection completion methods, filtered back projection, maximum likelihood transmission, iterative reconstruction, and linear interpolation methods. The majority of metal artifact reduction methods involve reconstructing images while accounting for metal objects. Key steps include identifying metal regions, interpolating or weighting missing projection data, and iteratively reconstructing images until artifacts are reduced. Compressed sensing methods can also exploit sparsity to reduce artifacts with fewer angular projections.
This document summarizes research on vertical handoff performance in wireless local area networks (WLANs). It examines the data traffic received by different access points as mobile stations move between them. Graphs show how throughput and delay are impacted during handoffs. It also evaluates the performance of file transfer between wireless clients and servers connected by a WLAN backbone network comprising two routers. The document analyzes the effects of station mobility on metrics like traffic, delay, and throughput. In conclusion, it demonstrates vertical handoff triggering between a WiMAX and WLAN network as mobile nodes roam between the base stations.
This document discusses using decision feedback equalization to enhance the performance of optical communication systems. It proposes using a fractionally spaced decision feedback equalizer (FSDFE) combined with activity detection guidance (ADG) and tap decoupling (TD) to improve the equalizer's effectiveness. The FSDFE replaces the symbol spaced feedback filter with a fractionally spaced feedback filter to enhance stability, steady-state error performance, and convergence rate. Adding ADG and TD further improves the steady-state error performance and convergence rate by detecting active taps in the channel impulse response. Simulation results show the FSDFE with ADG and TD offers superior performance to the FSDFE without these techniques, with improved compensation of amplitude distortion.
This document discusses improving vehicle retrieval through the use of 3D models. It proposes a framework that constructs 3D vehicle models using active shape models, fits the 3D models to 2D images to extract vehicle parts, and rectifies the parts to a reference view. Feature extraction is then performed on the rectified parts, and locality sensitive hashing and inverted indexing are used for efficient vehicle retrieval. The framework aims to improve over existing 2D model-based approaches by leveraging 3D models to handle variations in vehicle appearance better.
This document summarizes a research paper on using near field communication (NFC) tags to enable mobile commerce (m-commerce). It discusses how an Android application could read NFC tags on products to add them to a virtual shopping cart. Payment could then be made via the app using existing online payment methods. The document provides background on m-commerce, mobile payments, and how NFC tags work. It also discusses security protocols for NFC-based communications between a user's mobile device and a merchant's terminal for contactless payments. The proposed system aims to make shopping more convenient and efficient for consumers compared to traditional retail models.
Syed Rizwan Ahmed Kazmi is currently working as a Key Accounts Supervisor and internal auditor at DIGICOM Trading (Pvt) Ltd since August 2014. Previously, he worked as an Emergency Medical Dispatcher at AMAN Foundation from June 2013 to August 2013 and as an Authorization Officer at MCB Bank Limited from April 2007 to March 2013. He has a Bachelor's degree in Commerce and experience working in export management and textiles.
Investigation of various orthogonal wavelets for precise analysis of X-ray im...IJERA Editor
Now-a-days X-rays are playing very important role in medicine. One of the most important applications of Xray
is detecting fractures in bones. X-ray provides important information about the type and location of the
fracture. Sometimes it is not possible to detect the fractures in X-rays with naked eye. So it needs further
processing to detect the fractures even at minute levels. To detect minute fractures, in this paper various edge
feature extraction methods are analyzed which helps medical practitioners to study the bone structure, detects
the bone fracture, measurement of fracture treatment, and treatment planning prior to surgery. The classical
derivative edge detection operators such as Roberts, Prewitt, sobel, Laplacian of Gaussian can be used as edge
detectors, but a lot of false edge information will be extracted. Therefore a technique based on orthogonal
wavelet transforms like Haar, daubechies, coiflet, symlets are applied to detect the edges and are compared.
Among all the methods, Haar wavelet transform method performs well in detecting the edges with better
quality. The various performance metrics like Ratio of Edge pixels to size of image (REPS), peak signal to noise
ratio (PSNR) and computation time are compared for various wavelets.
This document analyzes various wavelet transforms for edge detection in X-ray bone images. It begins with an introduction to edge detection and its importance in medical imaging. Classical derivative operators can detect edges but also extract false information and are sensitive to noise. Wavelet transforms offer multi-resolution analysis to detect edges at different scales. The document then provides background on wavelet theory and discrete wavelet transforms. It analyzes applying various orthogonal wavelets like Haar, Daubechies, and Coiflet to X-ray images and compares their performance in edge detection based on metrics like edge detection accuracy and computation time. Haar wavelets performed best at detecting edges with better quality in less time.
This document summarizes a research paper that presents a speech enhancement method using stationary wavelet transform. The method first classifies speech into voiced, unvoiced, and silence regions based on short-time energy. It then applies different thresholding techniques to the wavelet coefficients of each region - modified hard thresholding for voiced speech, semi-soft thresholding for unvoiced speech, and setting coefficients to zero for silence. Experimental results using speech from the TIMIT database corrupted with white Gaussian noise at various SNR levels show improved performance over other popular denoising methods.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Suppression of noise in noisy speech signal is required in many speech enhancement applications like signal recording and transmission from one place to other. In this paper a novel single line noise cancellation system is proposed using derivative of normalized least mean spare algorithm. The proposed system has two phases. The first phase is generation of secondary reference signal from incoming primary signal itself at initial silence period and pause between two words, which is essential while adaptive filter using as noise canceller. Second phase is noise cancellation using proposed modified error data normalized step size (EDNSS) algorithm. The performance of the proposed algorithm is compared with normalized least mean square (NLMS) algorithm and original EDNSS algorithm using standard IEEE sentence (SP23) of Noizeus data base with different types of real-world noise at different level of signal to noise ratio (SNR). The output of proposed, NLMS and EDNSS algorithm are measured with output SNR, excessive mean square error (EMSE) and misadjustment (M). The results clearly illustrates that the proposed algorithm gives improved result over conventional NLMS and EDNSS algorithm. The speed of convergence is also maintained as same conventional NLMS algorithm.
Electrocardiogram Denoised Signal by Discrete Wavelet Transform and Continuou...CSCJournals
One of commonest problems in electrocardiogram (ECG) signal processing is denoising. In this paper a denoising technique based on discrete wavelet transform (DWT) has been developed. To evaluate proposed technique, we compare it to continuous wavelet transform (CWT). Performance evaluation uses parameters like mean square error (MSE) and signal to noise ratio (SNR) computations show that the proposed technique out performs the CWT.
The document proposes a new approach to text-dependent speaker identification that uses transformation techniques like the discrete Fourier transform to convert speech signals to the frequency domain after removing silence, and extracts features using the row mean method. It describes how speech signals are framed, windowed, and converted to a spectrogram before calculating the Euclidean distance between feature vectors to identify speakers in a database who have the minimum distance to a test speech sample. The method was tested on 120 speech samples from 30 speakers and was able to accurately identify speakers based on a single sentence.
30 9762 extension paper id 0030 (edit i)IAESIJEECS
This paper deals with border distortion effect at starting and ending of finite signal by proposing sliding window technique and basic extension mode implementation. Single phase of transient and voltage sag is chosen to be analyzed in wavelet. The signal which being used for the analysis is simulated in Matlab 2017a. Disturbance signal decomposes into four level and Daubechies 4 (db4) has been chosen for computation. The proposed technique has been compared with conventional method which is finite length power disturbance analysis. Simulation result revealed that the proposed smooth-padding mode can be successfully minimized the border distortion effect compared to the zero-padding and symmetrization
Improving the Efficiency of Spectral Subtraction Method by Combining it with ...IJORCS
In the field of speech signal processing, Spectral subtraction method (SSM) has been successfully implemented to suppress the noise that is added acoustically. SSM does reduce the noise at satisfactory level but musical noise is a major drawback of this method. To implement spectral subtraction method, transformation of speech signal from time domain to frequency domain is required. On the other hand, Wavelet transform displays another aspect of speech signal. In this paper we have applied a new approach in which SSM is cascaded with wavelet thresholding technique (WTT) for improving the quality of speech signal by removing the problem of musical noise to a great extent. Results of this proposed system have been simulated on MATLAB.
Signal Processing of Radar Echoes Using Wavelets and Hilbert Huang Transformsipij
Atmospheric Radar Signal Processing is one field of Signal Processing where there is a lot of scope for development of new and efficient tools for spectrum cleaning, detection and estimation of desired parameters. The wavelet transform and HHT (Hilbert-Huang transform) are both signal processing methods. This paper is based on comparing HHT and Wavelet transform applied to Radar signals. Wavelet analysis is one of the most important methods for removing noise and extracting signal from any data. The de-noising application of the wavelets has been used in spectrum cleaning of the atmospheric radar signals. HHT can be used for processing non-stationary and nonlinear signals. HHT is one of the timefrequency analysis techniques which consists of two parts: Empirical Mode Decomposition (EMD) and instantaneous frequency solution. EMD is a numerical sifting process to decompose a signal into its fundamental intrinsic oscillatory modes, namely intrinsic mode functions (IMFs). A series of IMFs can be obtained after the application of EMD. In this paper wavelets and EMD has been applied to the time series data obtained from the mesosphere-stratosphere-troposphere (MST) region near Gadanki, Tirupati for 6 beam directions. The Algorithm is developed and tested using Matlab. Moments were estimated and analysis has brought out improvement in some of the characteristic features like SNR, Doppler width, Noise power of the atmospheric signals. The results showed that the proposed algorithm is efficient for dealing non-linear and non- stationary signals contaminated with noise. The results were compared using ADP (Atmospheric Data Processor) and plotted for validation of the proposed algorithm.
This document discusses audio compression using multiple transformation techniques for audio applications. It compares the Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) for compressing audio signals. The DCT and DWT are applied to audio signals to generate new data sets with smaller values, achieving compression. Performance is evaluated using metrics like compression ratio, peak signal-to-noise ratio, signal-to-noise ratio, and normalized root mean square error. The results show that DWT provides a lower compression ratio but higher performance metrics compared to DCT. Overall, the document examines using DCT and DWT transforms to compress audio signals and compares their performance.
Data Compression using Multiple Transformation Techniques for Audio Applicati...iosrjce
IOSR Journal of Computer Engineering (IOSR-JCE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of computer engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in computer technology. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
1) The document discusses audio compression using Daubechie wavelets. It involves using optimal wavelet selection and quantizing wavelet coefficients along with A-law and U-law companding methods.
2) The key steps of wavelet-based audio compression are thresholding and quantizing wavelet coefficients, then encoding the data to remove redundancy and reduce the number of coefficients.
3) A psychoacoustic model is incorporated to determine inaudible quantization noise levels based on auditory masking principles. The masking thresholds are converted to constraints in the wavelet domain to guide coefficient quantization and selection of an optimal wavelet basis.
Recovery of low frequency Signals from noisy data using Ensembled Empirical M...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
WAVELET THRESHOLDING APPROACH FOR IMAGE DENOISINGIJNSA Journal
This document presents a wavelet thresholding approach for image denoising. It proposes using a Bayesian technique to determine an adaptive threshold based on modeling wavelet coefficients with a generalized Gaussian distribution. The proposed threshold performs better than traditional methods like Donoho and Johnston's SureShrink. Experimental results on the Lena image show the proposed method significantly outperforms hard and soft thresholding in terms of peak signal-to-noise ratio, especially at higher noise levels. It concludes the adaptive thresholding approach effectively removes noise from images.
In the recent years, large scale information transfer by remote computing and the development
of massive storage and retrieval systems have witnessed a tremendous growth. To cope up with the
growth in the size of databases, additional storage devices need to be installed and the modems and
multiplexers have to be continuously upgraded in order to permit large amounts of data transfer between
computers and remote terminals. This leads to an increase in the cost as well as equipment. One solution
to these problems is “COMPRESSION” where the database and the transmission sequence can be
encoded efficiently. In this we investigated for optimum wavelet, optimum level, and optimum scaling
factor.
Speech is the vocalizer form of human communication,and based upon the syntactic combination of lexical and vocabularies. The aim of speech coding is to compress the speech signal to the highest possible compression ratio bu t maintaining user acceptability.There are many methods for speech compression like Linear Pre dictive coding (LPC),Code Excited Linear Predictive coding (CELP),Sub-band coding,T ransform coding:- Fast Fourier Transform (FFT),Discrete Cosine Transform (DCT),Continuous Wavelet Transform (CWT),Discrete Wavelet Transform (DWT),Variance Fractal Compression (VFC),Discrete Cosine Transform (DCT),Psychoacoustics and etc. Few of them are discus in this paper.
UNDER WATER NOISE REDUCTION USING WAVELET AND SAVITZKY-GOLAYcsandit
This summary provides the key details from the document in 3 sentences:
The document discusses two methods for reducing noise in underwater acoustic signals used for depth estimation: wavelet-based denoising using stationary wavelet transform and Savitzky-Golay filtering. It analyzes the performance of different wavelet types and polynomial orders/frame sizes for the two filtering methods based on peak signal-to-noise ratio. The results show that Harr wavelet and higher order polynomials with smaller frame sizes provided better noise reduction for the underwater depth estimation signals.
This document reviews and compares three noise reduction techniques based on wavelet transform: Wavelet Split Coefficient, Hard Thresholding, and Soft Thresholding. It describes how each technique works, including that Hard Thresholding sets wavelet coefficients below a threshold to zero while Soft Thresholding also shrinks nonzero coefficients. The document presents an algorithm to implement denoising using wavelet transforms and illustrates it with an example of removing white noise from a speech signal. It finds that Soft Thresholding performs better than Hard Thresholding by removing nonlinearity and noise spikes.
This document summarizes a research paper that examines pricing strategy in a two-stage supply chain consisting of a supplier and retailer. The supplier offers a credit period to the retailer, who then offers credit to customers. A mathematical model is formulated to maximize total profit for the integrated supply chain system. The model considers three cases based on the relative lengths of the credit periods offered at each stage. Equations are developed to represent the profit functions for the supplier, retailer and overall system in each case. The goal is to determine the optimal selling price that maximizes total integrated profit.
The document discusses melanoma skin cancer detection using a computer-aided diagnosis system based on dermoscopic images. It begins with an introduction to skin cancer and melanoma. It then reviews existing literature on automated melanoma detection systems that use techniques like image preprocessing, segmentation, feature extraction and classification. Features extracted in other studies include asymmetry, border irregularity, color, diameter and texture-based features. The proposed system collects dermoscopic images and performs preprocessing, segmentation, extracts 9 features based on the ABCD rule, and classifies images using a neural network classifier to detect melanoma. It aims to develop an automated diagnosis system to eliminate invasive biopsy procedures.
This document summarizes various techniques for image segmentation that have been studied and proposed in previous research. It discusses edge-based, threshold-based, region-based, clustering-based, and other common segmentation methods. It also reviews applications of segmentation in medical imaging, plant disease detection, and other fields. While no single technique can segment all images perfectly, hybrid and adaptive methods combining multiple approaches may provide better results. Overall, image segmentation remains an important but challenging task in digital image processing and computer vision.
This document presents a test for detecting a single upper outlier in a sample from a Johnson SB distribution when the parameters of the distribution are unknown. The test statistic proposed is based on maximum likelihood estimates of the four parameters (location, scale, and two shape) of the Johnson SB distribution. Critical values of the test statistic are obtained through simulation for different sample sizes. The performance of the test is investigated through simulation, showing it performs well at detecting outliers when the contaminant observation represents a large shift from the original distribution parameters. An example application to census data is also provided.
This document summarizes a research paper that proposes a portable device called the "Disha Device" to improve women's safety. The device has features like live location tracking, audio/video recording, automatic messaging to emergency contacts, a buzzer, flashlight, and pepper spray. It is designed using an Arduino microcontroller connected to GPS and GSM modules. When the button is pressed, it sends an alert message with the woman's location, sets off an alarm, activates the flashlight and pepper spray for self-defense. The goal is to provide women a compact, one-click safety system to help them escape dangerous situations or call for help with just a single press of a button.
- The document describes a study that constructed physical fitness norms for female students attending social welfare schools in Andhra Pradesh, India.
- Researchers tested 339 students in classes 6-10 on speed, strength, agility and flexibility tests. Tests included 50m run, bend and reach, medicine ball throw, broad jump, shuttle run, and vertical jump.
- The results showed that 9th class students had the best average time for the 50m run. 10th class students had the highest flexibility on average. Strength and performance generally improved with increased class level.
This document summarizes research on downdraft gasification of biomass. It discusses how downdraft gasifiers effectively convert solid biomass into a combustible producer gas. The gasification process involves pyrolysis and reactions between hot char and gases that produce CO, H2, and CH4. Downdraft gasifiers are well-suited for biomass gasification due to their simple design and ability to manage the gasification process with low tar production. The document also reviews previous studies on gasifier configuration upgrades and their impact on performance, and the principles of downdraft gasifier operation.
This document summarizes the design and manufacturing of a twin spindle drilling attachment. Key points:
- The attachment allows a drilling machine to simultaneously drill two holes in a single setting, improving productivity over a single spindle setup.
- It uses a sun and planet gear arrangement to transmit power from the main spindle to two drilling spindles.
- Components like gears, shafts, and housing were designed using Creo software and manufactured. Drill chucks, bearings, and bits were purchased.
- The attachment was assembled and installed on a vertical drilling machine. It is aimed at improving productivity in mass production applications by combining two drilling operations into one setup.
The document presents a comparative study of different gantry girder profiles for various crane capacities and gantry spans. Bending moments, shear forces, and section properties are calculated and tabulated for 'I'-section with top and bottom plates, symmetrical plate girder, 'I'-section with 'C'-section top flange, plate girder with rolled 'C'-section top flange, and unsymmetrical plate girder sections. Graphs of steel weight required per meter length are presented. The 'I'-section with 'C'-section top flange profile is found to be optimized for biaxial bending but rolled sections may not be available for all spans.
This document summarizes research on analyzing the first ply failure of laminated composite skew plates under concentrated load using finite element analysis. It first describes how a finite element model was developed using shell elements to analyze skew plates of varying skew angles, laminations, and boundary conditions. Three failure criteria (maximum stress, maximum strain, Tsai-Wu) were used to evaluate first ply failure loads. The minimum load from the criteria was taken as the governing failure load. The research aims to determine the effects of various parameters on first ply failure loads and validate the numerical approach through benchmark problems.
This document summarizes a study that investigated the larvicidal effects of Aegle marmelos (bael tree) leaf extracts on Aedes aegypti mosquitoes. Specifically, it assessed the efficacy of methanol extracts from A. marmelos leaves in killing A. aegypti larvae (at the third instar stage) and altering their midgut proteins. The study found that the leaf extract achieved 50% larval mortality (LC50) at a concentration of 49 ppm. Proteomic analysis of larval midguts revealed changes in protein expression levels after exposure to the extract, suggesting its bioactive compounds can disrupt the midgut. The aim is to identify specific inhibitor proteins in the midg
This document presents a system for classifying electrocardiogram (ECG) signals using a convolutional neural network (CNN). The system first preprocesses raw ECG data by removing noise and segmenting the signals. It then uses a CNN to extract features directly from the ECG data and classify arrhythmias without requiring complex feature engineering. The CNN architecture contains 11 convolutional layers and is optimized using techniques like batch normalization and dropout. The system was tested on ECG datasets and achieved classification accuracy of over 93%, demonstrating its effectiveness at automated ECG classification.
This document presents a new algorithm for extracting and summarizing news from online newspapers. The algorithm first extracts news related to the topic using keyword matching. It then distinguishes different types of news about the same topic. A term frequency-based summarization method is used to generate summaries. Sentences are scored based on term frequency and the highest scoring sentences are selected for the summary. The algorithm was evaluated on news datasets from various newspapers and showed good performance in intrinsic evaluation metrics like precision, recall and F-score. Thus, the proposed method can effectively extract and summarize online news for a given keyword or topic.
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International Journal of Research in Advent Technology
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A COMPARATIVE STUDY OF DENOISING 1-D
DATA USING WAVELET TRANSFORM
Hemant Tulsani 1
, Rashmi Gupta 2
1 2
Electronics and Communication Department
1 2
Ambedkar Institute Of Advanced Communication Technologies And Research
New Delhi-110031, India
1
hemanttulsani@gmail.com
ABSTARCT:
In this paper, discrete wavelet transform (DWT) for noise removal has been studied over four different
types of synthetic data. These are blocks signal, bumps signal, doppler signal and heavy sine signal. These
signal sets are first corrupted with white noise and then DWT is used for noise removal. The impact of
different levels of decomposition along with the type of thresholding criterion, hard or soft, over output
signal to noise ratio (SNR) and mean square error is presented. The waveforms of original and
reconstructed signals for all levels of decomposition is also presented in the paper. All simulations are
done in MATLAB.
Keywords: Wavelets based denoising, Signal decomposition, Hard Soft Thresholding
1. INTRODUCTION
Role of signals and systems is important in all aspects of modern technologies. However, a certain amount of
unwanted signal i.e., noise is always introduced in digital signals. The noise is generally introduced while
acquisition and transmission of data signals.
Introduction of noise in any signal degrades the quality of signal as well as the information content of the signal
is lost to some extent. Hence, it is highly necessary to remove noise from the signal so that the information can
be recovered from it. This type of signal restoration which is associated with an attempt of removal of noise
from a signal is known as denoising. Noise is considered to have higher frequencies compared to signal. Hence,
filtering was the most popular technique applied for denoising applications. Different linear and non-linear
filters are proposed by researchers. Some examples of filters are mean filter, median filter, least mean square
(LMS) filter, wiener filter, etc. Research in this field has led to development of new denoising techniques such
as optimal estimate methods, spectral subtraction methods, general and genetic matching pursuit methods.
However, the newest approach in this field is denoising using wavelet transform method.
The traditional methods for denoising were based on the Fourier transformation and the short-time Fourier
transformation [13] but the analysis effects of them were not good enough as the requirement was time
frequency representation of signal. In Fourier transformation, the signal analysis is done completely in
frequency domain. It can only analyze what frequency components exist in the signal. Hence, the time and
frequency information could not be analyzed at the same time. The concept of short-time Fourier transformation
(STFT) analysis is a bit different and comparatively better. It used the concept of windowing the signal i.e.,
analyzing only a small section of the signal at a time.
To overcome the resolution problem in traditional approaches, the wavelet transform was introduced. The
wavelet transformation is a time-frequency signal analysis tool having characteristics of Multi-resolution
Analysis (MRA) [12]. It has an ability to represent signal's partial characteristic in both time and frequency
domain. Hence, it is a kind of time-frequency localization analysis method. Another characteristic of wavelet
transform is that the width of window function is variable. The window function is known as mother wavelet (a
signal with tiny oscillations and which does not lasts forever). Hence, the wavelet transform is translated and
dilated version of a mother wavelet.
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Volume 2, Issue 1, January 2014
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Available Online at: http://www.ijrat.org
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The discrete wavelet transform and it's variants is based on dyadic decomposition of a input signal into
approximation and detail coefficients. Based on the methodology employed in decomposition of signals,
wavelet transform may be termed as Discrete Wavelet Transform (DWT) or Discrete Wave Packet Transform
(DWPT) [11] [12]. In DWT, only the approximation coefficients at each level are further decomposed. In
DWPT, detail coefficients along with approximation coefficients are decomposed. Discrete wavelet transform
(DWT) is a powerful tool using multi-resolution analysis (MRA) to analyze a signal. It has been used in speech
recognition systems, signal and image compression and denoising.
2. METHODOLOGY
The basic methodology is used in noise removal in wavelet domain is shown in Figure 1.
2.1. Forward Transform
Input signal is transformed to wavelet domain using discrete wavelet transform.
2.2. Threshold Calculation
Removal of noise from a signal using wavelets is based on thresholding technique called wavelet thresholding.
It is a non-linear technique. In this, some of the wavelet decomposed coefficients particularly detail coefficients
which contain noise elements which are less than a predefined or dynamically computed threshold are made
zero. Hence, this process is also known as wavelet shrinking [1]. Selecting an appropriate threshold is a topic of
utmost importance as the efficiency of the algorithm entirely depend on its selection [2].
Fig. 1. Methodology
Input Signal
Forward
Transform
Threshold Calculation
Threshold Application
Reconstructed Signal
Inverse
Transform
3. E-ISSN: 2321–9637
Volume 2, Issue 1, January 2014
International Journal of Research in Advent Technology
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Global and Level dependent Threshold
The calculation of threshold may or may not depend on the decomposition levels. If a threshold value is
selected for each decomposition level , then the threshold is said to be level dependent threshold. However, if a
same threshold value is calculated for coefficients at all levels, then the threshold is termed as global threshold
[3] [14].
Various functions have been proposed to calculate an appropriate threshold value. Most accepted of those
include VisuShrink and SureShrink. These are explained below.
VisuShrink
VisuShrink was introduced by Donoho [6]. It uses a threshold value t that is proportional to the standard
deviation of the noise. It follows the hard thresholding rule. It is defined as:
2logt nσ= . (1)
2
σ is the noise variance present in the signal and represents the signal size or number of samples. An estimate
of the noise level was defined based on the median absolute deviation given by:
{ }( )1
1, : 0,1,...,2 1
0.6745
j
j kmedian d k
σ
−
− = −
= . (2)
where 1,j kd − corresponds to the detail coefficients in the wavelet transform.
VisuShrink can be viewed as general-purpose threshold selector which provide near optimal error properties. It
also ensures that the estimates are as smooth as the true underlying functions.
Major drawbacks of VisuShrink include overly smoothed reconstructed signals as it removes too many
coefficients, only applicable to signal corrupted with AWGN, and following of global thresholding scheme.
SureShrink
A threshold chooser based on Stein’s Unbiased Risk Estimator (SURE) was proposed by Donoho and Johnstone
[6] and is called as SureShrink. It is a combination of the universal threshold and the SURE threshold. This
method specifies a threshold value for each resolution level in the wavelet transform which is referred to as level
dependent thresholding. The goal of SureShrink is to minimize the mean squared error, defined as
( )2
2
, 1
1
MSE ( , ) ( , )
n
x y
z x y s x y
n =
= −∑ . (3)
where ( , )z x y is the estimate of the signal while ( , )s x y is the original signal without noise and n is the
length of the signal. SureShrink suppresses noise by thresholding the empirical wavelet coefficients.
The SureShrink threshold t∗
is defined as
min( , 2log )t t nσ∗
= . (4)
where t denotes the value that minimizes Stein’s Unbiased Risk Estimator, σ is the noise variance computed as
in case of VisuShrink, and n is the length of the signal. The thresholding employed is adaptive, i.e., a threshold
level is assigned to each dyadic resolution level by the principle of minimizing the Stein’s Unbiased Risk
Estimator for threshold estimates. It is smoothness adaptive which means that if the unknown function contains
abrupt changes in the signal, the reconstructed signal also does.
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2.3. Threshold Application
After calculating a threshold value, a thresholding function ( )f x is required which is applied to threshold the
coefficients. This function is dependent upon the threshold value t . There are two general categories to
threshold function. They are hard threshold and soft threshold functions [8]. The hard threshold function [7] can
be expressed as:
( )
0
h
x x t
f x
otherwise
≥
= . (5)
Hard threshold function is known to retain the sharp features of the signal however, it may mistake noise for
true signal.
The soft threshold function [5] can be expressed as:
( )
( )
0
s
sign x x t x t
f x
otherwise
− ≥
= . (6)
Soft Threshold function is known to perform well in smooth regions but it over smooth sharp features. Hence
the sharp characteristics of signal are lost.
Therefore, a new threshold function, hard-soft threshold was presented which unifies soft and hard threshold and
may retain the chief signal features and at the same time, be possible to meet the smoothness requirements. The
expression for hard-soft threshold is given below:
( )
( ) 0 1
0
s
sign x x t x t
f x
otherwise
α
α
− ≥ = ≤ ≤
. (6)
The parameter α (scaling factor) defines the boundary between the hard and soft thresholding. If 1α = , the
function follow soft threshold while 0α = follow hard threshold. The choice of 0< 1α < tend to overcome the
drawbacks of both hard and soft threshold functions.
The different threshold functions are shown in Figure 2. It can be inferred that hard threshold function keeps all
the values of the signal for x t≥ while completely removes all other values. Soft threshold function works
similar to hard threshold except that it scales down the values. Hard soft threshold function provides a
compromise between the other functions.
Fig. 2. Different threshold functions
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3. SIMULATION SETUP
Four simulated signals are used for experimentation purpose. They are corrupted with additive white noise
resulting in a noisy signal. Figure 3 show the four signals used, and Figure 4 show the corresponding noisy
signals obtained.
a b
c d
Fig. 3. Simulated Reference Signals (a) Blocks (b) Bumps (c) Doppler (d) Heavy Sine
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To compare the performance of proposed threshold selection algorithms and wavelet decomposition algorithms
for one dimensional data, few parameters [9] [10] have to be computed for each case. The signal notations
followed in this text are tabulated in Table 1.
a b
c d
Fig. 4. Simulated Noisy Signals (a) Blocks (b) Bumps (c) Doppler (d) Heavy Sine
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Table 1. Signal notations.
Notation Signal
[ ]s n Reference Signal
[ ]w n Noise signal
[ ]z n Noisy Signal
[ ]y n Reconstructed Signal
Input Signal to Noise Ratio:
It is defined as
[ ]
[ ]
2
1
10 2
1
10log
N
i
i N
i
s i
SNR
w i
=
=
=
∑
∑
. (7)
Output Signal to Noise Ratio:
It is defined as
[ ]
[ ] [ ]{ }
2
1
10 2
1
10log
N
i
o N
i
y i
SNR
s i y i
=
=
=
−
∑
∑
. (8)
o
SNR should always be greater than i
SNR . Higher the o
SNR compared to i
SNR , better the algorithm.
Mean Square Error:
It is defined as
[ ] [ ]{ }
2
1
1 N
i
s i y i
N
ε
=
= −∑ . (9)
Mean square error value should be minimum for better algorithm.
The wavelets used for evaluation purposes are haar for blocks and db8 for rest signals. The threshold selector
used is universal threshold selector or VisuShrink. Different decomposition levels are also compared for
performance evaluation which are 4, 5, 6, 7, 8 and 9. The results for soft and hard thresholding criterion are also
compared.
4. RESULTS AND DISCUSSION
The results are compiled for each signal discussed in previous section one by one. First, the results of denoising
noisy Blocks signal, Bumps signal, Doppler signal, Heavy Sine signal for all levels of decomposition are shown
in figures 5, 6, 7 and 8.
The computed performance parameters are listed in Table 2.
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Fig. 5. Denoising results for Noisy Blocks signal.
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Fig. 6. Denoising results for Noisy Bumps signal.
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Fig. 7. Denoising results for Noisy Doppler signal.
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Fig. 8. Denoising results for Noisy Heavy Sine signal.
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Table 2. Performance Parameters.
Decomposition Levels iSNR
0SNR Mean Square Error
Soft
Threshold
Hard
Threshold
Soft
Threshold
Hard
Threshold
Noisy Blocks Signal
4 20.53044 31.48765 27.18516 0.078079 0.20885
5 20.53044 33.44806 26.73679 0.049703 0.23074
6 20.53044 35.03504 26.36002 0.034485 0.250191
7 20.53044 35.79701 25.87709 0.028934 0.278555
8 20.53044 36.07692 25.47609 0.027127 0.302718
9 20.53044 36.13255 25.08213 0.026782 0.330014
Noisy Bumps Signal
4 18.28755 28.67674 28.2855 0.090823 0.099367
5 18.28755 28.75359 25.60415 0.089177 0.183502
6 18.28755 27.90432 22.99783 0.108401 0.329285
7 18.28755 27.62304 21.68634 0.115641 0.436934
8 18.28755 27.41755 20.91398 0.121234 0.513478
9 18.28755 27.41336 20.54881 0.121347 0.548824
Noisy Doppler Signal
4 16.2299 28.61423 28.61423 0.057789 0.057789
5 16.2299 31.22018 31.1995 0.031691 0.031841
6 16.2299 31.49929 26.86191 0.029703 0.085249
7 16.2299 30.83562 24.1856 0.034601 0.153208
8 16.2299 30.89928 22.90482 0.034099 0.201017
9 16.2299 30.77057 22.14459 0.035123 0.237039
Noisy Heavy Sin Signal
4 17.17217 28.18741 28.18741 0.080296 0.080296
5 17.17217 30.15914 29.43562 0.050964 0.060184
6 17.17217 30.47433 29.10857 0.047375 0.064838
7 17.17217 30.3091 28.00843 0.049197 0.083425
8 17.17217 29.77172 26.48552 0.05566 0.118212
9 17.17217 29.70984 25.91715 0.056456 0.133977
Various conclusions can be drawn from the results. The impact of hard and soft threshold functions can be
summarized as below:
(1) Soft Thresholding performs well in smooth regions.
(2) Soft Thresholding over smooths sharp features hence the sharp characteristics of signal are lost.
(3) Hard thresholding retains the sharp features of the signal.
(4) Hard thresholding may mistake noise for true signal.
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Also, on increasing the decomposition levels of the signal, the performance drops for soft threshold function
while it rises up to a certain level and then drops a little and finally saturates for hard threshold function. MSE
performance shown by the algorithm in almost all the cases is quite good which can be inferred from Table 2.
References
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[3] Albert C.To, Jeffrey R. Moore, Steven D. Glaser (2008): Wavelet denoising techniques with applications to experimental geophysical
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[9] Satish L., Nazneen B. (2003): Wavelet-based denoising of partial discharge signals buried in excessive noise and interference, IEEE
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[14] Sarita Dangeti (2003): Denoising Techniques - A Comparison. M.S. thesis, Graduate Faculty of the Louisiana State University and
Agricultural and Mechanical College
Rashmi Gupta received degree in Electronics and Communication Engineering from Institute of
Electronics and Telecommunication Engineering, Delhi. M.E. in Electronics and Communication
Engineering from Delhi University and is currently pursuing Ph.D. on topic “Designing a global
framework for non-linear dimension reduction” from Delhi University. She worked in Calcom group of
companies, Hindu Institute of Technology, Maharaja Agrasen Institute of Technology, Delhi. She is
currently working as Associate Professor in Ambedkar Institute of Advanced Communication
Technologies and Research, Delhi. She has authored over 18 research papers in various
International/National journals and conferences. She is member of IEEE and life member of IETE.
Hemant Tulsani received degree in Electronics and Communication Engineering from Guru Gobind
Singh Indraprastha University, Delhi. He is currently a research scholar at Ambedkar Institute of
Advanced Communication Technologies and Research, Delhi. He has authored 5 research papers in
International journals and conferences.