The intention of this article is to show the effects that intermodulation noise produce in Amplitude Modulation Systems (AM Systems ) highlighting the importance of these systems for broadcasters.In addition it also shows a reducing intermodulation noise filter for AM transmission systems, This filter works in an ideal manner, for example, into the modulated signal that is contaminated by noise from effects of such modulation the filter output and the modulated signal should appear with the magnitude of the almost imperceptible noise. To verify that the output signal is the desired, measurements ODG (Objective Difference Grade) which is a measure of quality based on PEAQ (Perceptual Evaluation of Audio Quality) obtaining an average value of - 0.482appears a result indicating a relatively imperceptible noise.
AM – Frequency spectrum – vector representation – power relations – generation of AM – DSB, DSB/SC, SSB, VSB AM Transmitter & Receiver; FM and PM – frequency spectrum – power relations : NBFM & WBFM, Generation of FM and DM, Armstrong method & Reactance modulations : FM & PM frequency.
In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole. The components of a communications system serve a common purpose, are technically compatible, use common procedures, respond to controls, and operate in union. Telecommunications is a method of communication (e.g., for sports broadcasting, mass media, journalism, etc.). A communications subsystem is a functional unit or operational assembly that is smaller than the larger assembly under consideration.
AM – Frequency spectrum – vector representation – power relations – generation of AM – DSB, DSB/SC, SSB, VSB AM Transmitter & Receiver; FM and PM – frequency spectrum – power relations : NBFM & WBFM, Generation of FM and DM, Armstrong method & Reactance modulations : FM & PM frequency.
In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole. The components of a communications system serve a common purpose, are technically compatible, use common procedures, respond to controls, and operate in union. Telecommunications is a method of communication (e.g., for sports broadcasting, mass media, journalism, etc.). A communications subsystem is a functional unit or operational assembly that is smaller than the larger assembly under consideration.
In this paper, the performances of adaptive noise cancelling system employing Least Mean Square (LMS) algorithm are studied considering both white Gaussian noise (Case 1) and colored noise (Case 2)
situations. Performance is analysed with varying number of iterations, Signal to Noise Ratio (SNR) and tap size with considering Mean Square Error (MSE) as the performance measurement criteria. Results show that the noise reduction is better as well as convergence speed is faster for Case 2 as compared with Case 1. It is also observed that MSE decreases with increasing SNR with relatively faster decrease of MSE in Case 2 as compared with Case 1, and on average MSE increases linearly with increasing number of filter
coefficients for both type of noise situations. All the experiments have been done using computer
simulations implemented on MATLAB platform.
Development of a receiver circuit for medium frequency shift keying signals.inventionjournals
Frequency shift keying (fsk) mode of digital signal information transfer switches between two predetermined frequencies of the carrier wave, either by modulating one sine wave oscillator or by switching between two oscillators.The need for a receiver to decode an fsk signal along the transmitting medium from a digital source code within about 5 kilometer radius for security monitoring of environment informed this work. The design of a receiver circuit at a frequency of 500 kHzfor an input frequency shift keying (fsk) signal from a transmitter is presented. The receiver is to receive an RF signal, amplify it, filter it to remove unwanted signals, and recover the desired base band information. It consists of an amplifier, tuned circuitsand mixers which filters the base-band information. A comparator circuit is incorporated, to detect the digital signal received. The output from the comparators is the digital equivalent of the coded signals sent by the transmitter circuit, and transferred to a microcontroller circuit, to act as a coded signal representing information from the transmitting end. The bode-plot response of the receiver to the incoming signals using a FET tuned circuit, shows that only frequencies above 470kHz, and below 495kHz are allowed to pass through the network with a resonant frequency of 483.553 kHz and a gain of 27.734dB, while others are totally attenuated. The reliability of the designed receiver circuit was evaluated for a 1 year continuous operating period and was found to be 74.7%.Area of application of this work include electronic policing of a defined environment with good success
Takeoff Projects helps students complete their academic projects.You can enrol with friends and receive modulation techniques kits at your doorstep. You can learn from experts, build latest projects, showcase your project to the world and grab the best jobs. Get started today!
https://takeoffprojects.com/modulation-techniques
Minimize MIMO OFDM interference and noise ratio using polynomial-time algorit...IJECEIAES
In the distributed transmit antenna MIMO OFDM system, each transmitting antenna has different frequency offset between each transmitting antenna and receiver due to the use of independent crystal oscillator. This paper proposes Polynomial-time algorithm for correcting the frequency offset in a received signal by maximizing the conditional average signal. The algorithm focus on reducing to interference and noise ratio of each subcarrier on the receiving antenna by frequency offset. The simulation result shows the performance of the proposed algorithm is slightly improved compared with the existing frequency offset correction algorithm, and the complexity is reduced by 50% or more.
For ease of analog or digital information transmission and reception, modulation is the foremost important technique. In the present project, we’ll discuss about different modulation scheme in digital mode done by operating a switch/ key by the digital data. As we know, by modifying basic three parameters of the carrier signal, three basic modulation schemes can be obtained; generation and detection of these three modulations are discussed and compared with respect to probability of error or bit error rate (BER).
In this paper, the performances of adaptive noise cancelling system employing Least Mean Square (LMS) algorithm are studied considering both white Gaussian noise (Case 1) and colored noise (Case 2)
situations. Performance is analysed with varying number of iterations, Signal to Noise Ratio (SNR) and tap size with considering Mean Square Error (MSE) as the performance measurement criteria. Results show that the noise reduction is better as well as convergence speed is faster for Case 2 as compared with Case 1. It is also observed that MSE decreases with increasing SNR with relatively faster decrease of MSE in Case 2 as compared with Case 1, and on average MSE increases linearly with increasing number of filter
coefficients for both type of noise situations. All the experiments have been done using computer
simulations implemented on MATLAB platform.
Development of a receiver circuit for medium frequency shift keying signals.inventionjournals
Frequency shift keying (fsk) mode of digital signal information transfer switches between two predetermined frequencies of the carrier wave, either by modulating one sine wave oscillator or by switching between two oscillators.The need for a receiver to decode an fsk signal along the transmitting medium from a digital source code within about 5 kilometer radius for security monitoring of environment informed this work. The design of a receiver circuit at a frequency of 500 kHzfor an input frequency shift keying (fsk) signal from a transmitter is presented. The receiver is to receive an RF signal, amplify it, filter it to remove unwanted signals, and recover the desired base band information. It consists of an amplifier, tuned circuitsand mixers which filters the base-band information. A comparator circuit is incorporated, to detect the digital signal received. The output from the comparators is the digital equivalent of the coded signals sent by the transmitter circuit, and transferred to a microcontroller circuit, to act as a coded signal representing information from the transmitting end. The bode-plot response of the receiver to the incoming signals using a FET tuned circuit, shows that only frequencies above 470kHz, and below 495kHz are allowed to pass through the network with a resonant frequency of 483.553 kHz and a gain of 27.734dB, while others are totally attenuated. The reliability of the designed receiver circuit was evaluated for a 1 year continuous operating period and was found to be 74.7%.Area of application of this work include electronic policing of a defined environment with good success
Takeoff Projects helps students complete their academic projects.You can enrol with friends and receive modulation techniques kits at your doorstep. You can learn from experts, build latest projects, showcase your project to the world and grab the best jobs. Get started today!
https://takeoffprojects.com/modulation-techniques
Minimize MIMO OFDM interference and noise ratio using polynomial-time algorit...IJECEIAES
In the distributed transmit antenna MIMO OFDM system, each transmitting antenna has different frequency offset between each transmitting antenna and receiver due to the use of independent crystal oscillator. This paper proposes Polynomial-time algorithm for correcting the frequency offset in a received signal by maximizing the conditional average signal. The algorithm focus on reducing to interference and noise ratio of each subcarrier on the receiving antenna by frequency offset. The simulation result shows the performance of the proposed algorithm is slightly improved compared with the existing frequency offset correction algorithm, and the complexity is reduced by 50% or more.
For ease of analog or digital information transmission and reception, modulation is the foremost important technique. In the present project, we’ll discuss about different modulation scheme in digital mode done by operating a switch/ key by the digital data. As we know, by modifying basic three parameters of the carrier signal, three basic modulation schemes can be obtained; generation and detection of these three modulations are discussed and compared with respect to probability of error or bit error rate (BER).
Analysis and Estimation of Harmonics Using Wavelet TechniqueRadita Apriana
The paper develops an approach based on wavelet technique for the evaluation and estimation of
harmonic contents of power system waveform. The proposed algorithm decomposes the signal waveforms
into the uniform frequency sub-bands corresponding to the odd harmonic components of the signal. The
proposed implementation of algorithm determines the frequency bands of harmonics which retain both the
time and frequency relationship of the original waveforms and uses a method to suppress those
harmonics.Thewaveletalgorithm is selected to obtain compatible output bands with the harmonic groups
defined in the standards for power-supply systems. A comparative analysis will be done with the input and
the results obtained from the wavelet transform (WT) for different measuring conditions and Simulation
results are given.
5. An analog filer has system fnction Ha(s)--a (a) (10 pts,) Comvert .pdfinfo324235
5. An analog filer has system fnction Ha(s)--a (a) (10 pts,) Comvert this analog filter into a
digital iker by means of the bilineasr filter by means of the bilinear trasformation method with T,
= 0.1. (b) (5 pts.) Is this filter FIR or IIR? (c) (5 pts.) Find the poles of this digital filher
Solution
Hundreds if not thousands of different kinds of filters have been developed to meet the needs of
various applications. Despite this variety, many filters can be described by a few common
characteristics. The first of these is the frequency range of their pass band. A filter\'s pass band is
the range of frequencies over which it will pass an incoming signal. Signal frequencies lying
outside the pass band are attenuated. Many filters fall into one of the following response
categories, based on the overall shape of their pass band.
Low-pass filters pass low-frequency signals while blocking high-frequency signals. The pass
band ranges from DC (0 Hz) to a corner frequency FC.
High-pass filters pass high-frequency signals while blocking DC and low-frequency signals. The
pass band ranges from a corner frequency (FC) to infinity.
Band-pass filters pass only signals between two given frequencies, blocking lower and higher
signals. The pass band lies between two frequencies, FL and FH. Signals between DC and FL are
blocked, as are signals from FH to infinity. The pass band of these filters is often characterized
as having a bandwidth that is symmetric around a center frequency.
Band-stop filters block signals occurring between two given frequencies, FL and FH. The pass
band is split into a low side (DC to FL) and a high side (FH to infinity). For this reason, it\'s
often simpler to specify a band-stop filter by the width and center frequency of its stop band.
Band-stop filters are also called notch filters, especially when the stop band is narrow.
Figure 1 shows how each of these filters operates on a swept-frequency input signal.
Figure 1. Filters are usually characterized by their frequency-domain performance. The effects
of a few common filter types on a swept-frequency input signal are shown here.
In the examples, the signal increases continuously in frequency, from a low frequency to a high
frequency. When the signal frequency is within the filter\'s pass band, the filter passes the signal.
As the signal moves out of the pass band, the filter begins to attenuate the signal.
Note that the transition from the pass band to the stop band is a gradual process, where the
filter\'s response decreases continuously. Although you can make this transition arbitrarily sharp
(at the cost of filter complexity), it can never be instantaneous, at least not in filters physically
realizable with today\'s technology.
The Bode and Phase Plots
Bode plots describe the behavior of a filter by relating the magnitude of the filter\'s response
(gain) to its frequency. An example of this type of plot is shown in Figure 2.
Figure 2. Filter responses are plotted on Bode plots, wh.
Capacity Enhancement of MIMO-OFDM System in Rayleigh Fading ChannelIOSR Journals
MIMO-OFDM system in Rayleigh Fading Channel is very popular technique for mobile
communication now a day’s for research. Here we want increase the capacity of MIMO-OFDM of system by
using adaptive modulation, Algebraic Space-Time Codes (ASTC) encoder for MIMO Systems are based on
quaternion algebras .we found that ergodic capacity has some limitation which reduce the system’s
performance to overcome this we use ASTC code . ASTC code are full rank, full rate and non vanishing constant
minimum determinant for increasing spectral efficiency and reducing Peak to Average Power Ratio (PAPR) .
Capacity Enhancement of MIMO-OFDM System in Rayleigh Fading ChannelIOSR Journals
Abstract: MIMO-OFDM system in Rayleigh Fading Channel is very popular technique for mobile communication now a day’s for research. Here we want increase the capacity of MIMO-OFDM of system by using adaptive modulation, Algebraic Space-Time Codes (ASTC) encoder for MIMO Systems are based on quaternion algebras .we found that ergodic capacity has some limitation which reduce the system’s performance to overcome this we use ASTC code . ASTC code are full rank, full rate and non vanishing constant minimum determinant for increasing spectral efficiency and reducing Peak to Average Power Ratio (PAPR) . Keywords— Adaptive modulation ASTC code, Capacity, BER, Ergodic capacity, PAPR, Spectral Efficiency and SNR
Similar to Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation (20)
Exploratory study on the use of crushed cockle shell as partial sand replacem...IJRES Journal
The increasing demand for natural river sand supply for the use in construction industry along
with the issue of environmental problem posed by the dumping of cockle shell, a by-product from cockle
business have initiated research towards producing a more environmental friendly concrete. This research
explores the potential use of cockle shell as partial sand replacement in concrete production. Cockle shell used
in this experimental work were crushed to smaller size almost similar to sand before mixed in concrete. A total
of six concrete mixtures were prepared with varying the percentages of cockle shell viz. 0%, 5%, 10%, 15%,
20% and 25%. All the specimens were subjected to continuous water curing. The compressive strength test was
conducted at 28 days in accordance to BS EN 12390. Finding shows that integration of suitable content of
crushed cockle shell of 10% as partial sand replacement able to enhance the compressive strength of concrete.
Adopting crushed cockle shell as partial sand replacement in concrete would reduce natural river sand
consumption as well as reducing the amount of cockle shell disposed as waste.
Congenital Malaria: Correlation of Umbilical Cord Plasmodium falciparum Paras...IJRES Journal
The vertical (trans-placental) transmission of the parasite Plasmodium falciparum from
pregnant mother to fetus during gestational period was investigated in a clinical research involving 43 full term
pregnant women in selected Hospitals in Jimeta Yola, Adamawa State Nigeria. During the observational study,
parasitemia was determined by light microscopic examination of umbilical and maternal peripheral blood film
for the presence of the trophozoites of Plasmodium falciparum. Correlational analysis was then carried on the
result obtained at p<0.05.><0.05) was established between maternal peripheral blood and umbilical cord
blood parasitemia with Pearson’s correlation coefficient of 0.762. Thus, in a malaria endemic area like Yola,
Adamawa State, Nigeria, with a stable transmission of parasite, there is a high probability of vertical
transmission of Plasmodium falciparum parasite from mother to fetus during gestation that can be followed by
the presentation of the symptoms of malaria by the newborn and other malaria related complications. Families
are advised to consistently sleep under appropriately treated insecticide mosquito net to avoid mosquito bite and
subsequent infestation.
Review: Nonlinear Techniques for Analysis of Heart Rate VariabilityIJRES Journal
Heart rate variability (HRV) is a measure of the balance between sympathetic mediators of heart
rate that is the effect of epinephrine and norepinephrine released from sympathetic nerve fibres acting on the
sino-atrial and atrio-ventricular nodes which increase the rate of cardiac contraction and facilitate conduction at
the atrio-ventricular node and parasympathetic mediators of heart rate that is the influence of acetylcholine
released by the parasympathetic nerve fibres acting on the sino-atrial and atrio-ventricular nodes leading to a
decrease in the heart rate and a slowing of conduction at the atrio-ventricular node. Sympathetic mediators
appear to exert their influence over longer time periods and are reflected in the low frequency power(LFP) of
the HRV spectrum (between 0.04Hz and 0.15 Hz).Vagal mediators exert their influence more quickly on the
heart and principally affect the high frequency power (HFP) of the HRV spectrum (between 0.15Hz and 0.4
Hz). Thus at any point in time the LFP:HFP ratio is a proxy for the sympatho- vagal balance. Thus HRV is a
valuable tool to investigate the sympathetic and parasympathetic function of the autonomic nervous system.
Study of HRV enhance our understanding of physiological phenomenon, the actions of medications and disease
mechanisms but large scale prospective studies are needed to determine the sensitivity, specificity and predictive
values of heart rate variability regarding death or morbidity in cardiac and non-cardiac patients. This paper
presents the linear and nonlinear to analysis the HRV.
Dynamic Modeling for Gas Phase Propylene Copolymerization in a Fluidized Bed ...IJRES Journal
A two-phase model is proposed for describing the dynamics of a fluidized bed reactor used for
polypropylene production. In the proposed model, the fluidized bed is divided into an emulsion and bubble
phase where the flow of gas is considered to be plug flow through the bubbles and perfectly mixed through the
emulsion phase. Similar previous models, consider the reaction in the emulsion phase only. In this work the
contribution of reaction in the bubble phase is considered and its effect on the overall polypropylene production
is investigated the kinetic model is combined with hydrodynamic model in order to develop a comprehensive
model for gas-phase propylene copolymerization reactor. Simulation profiles of the proposed model were
compared with those of well mixed model for the emulsion phase temperature. The simulated temperature
profile showed a lower rate of change compared to the previously reported models due to lower polymerization
rate. Model simulation showed that about 13% of the produced polymer comes from the bubble phase and this
considerable amount of polymerization in the bubbles should not be neglected in any modeling attempt.
Study and evaluation for different types of Sudanese crude oil propertiesIJRES Journal
Sudanese crude oil is regarded as one of the sweet types of crude in the world, Sulphur containing
compounds are un desirable in petroleum because they de activate the catalyst during the refining processes and
are the main source of acid rains and environmental pollution.(Mark Cullen 2001),Since it contains considerable
amount of salts and acids, it negatively impact the production facilities and transportation lines with corrosive
materials. However it suffers other problems in flow properties represented by the high viscosity and high
percentage of wax. Samples were collected after the initial and final treatment at CPF, and tested for
physical and chemical properties.wax content is in the range 23-31 weight % while asphalting content is about
0.1 weight% . Resin content is 13-7 weight % and deposits are 0.01 weight%. The carbon number distribution in
the crude is in the range 7-35 carbon atoms. The pour point vary between 39°C-42°C and the boiling point is in
the range 70 °C - 533 °C.
A Short Report on Different Wavelets and Their StructuresIJRES Journal
This article consists of basics of wavelet analysis required for understanding of and use of wavelet
theory. In this article we briefly discuss about HAAR wavelet transform their space and structures.
A Case Study on Academic Services Application Using Agile Methodology for Mob...IJRES Journal
Recently, Mobile Cloud Computing reveals many modern development areas in the Information
Technology industry. Several software engineering frameworks and methodologies have been developed to
provide solutions for deploying cloud computing resources on mobile application development. Agile
methodology is one of the most commonly used methodologies in the field. This paper presents the MCCAS a
Web and Mobile application that provide feature for the Palestinian higher education/academic institutions. An
Agile methodology was used in the development of the MCCAS but in parallel with emphasis on Cloud
computing resources deployment. Also many related issues is discussed such as how software engineering
modern methodologies (advances) influenced the development process.
Wear Analysis on Cylindrical Cam with Flexible RodIJRES Journal
Firstly, the kinetic equation of spatial cylindrical cam with flexible rod has been established. Then, an
accurate cylindrical cam mechanism model has been established based on the spatial modeling software
Solidworks. The dynamic effect of flexible rod on mechanical system was studied in detail based on the
mechanical system dynamics analytical software Adams, and Archard wear model is used to predict the wear of
the cam. We used Ansys to create finite element model of the cam link, extracted the first five order mode to
export into Adams. The simulation results show that the dynamic characteristics of spatial cylindrical cam
mechanical system with flexible rod is closed to ideal mechanism. During the cam rotate one cycle, the collision
in the linkage with a clearance occurs in some special location, others still keep a continuous contact, and the
prediction of wear loss is smaller than rigid body.
DDOS Attacks-A Stealthy Way of Implementation and DetectionIJRES Journal
Cloud Computing is a new paradigm provides various host service [paas, saas, Iaas over the internet.
According to a self-service,on-demand and pay as you use business model,the customers will obtain the cloud
resources and services.It is a virtual shared service.Cloud Computing has three basic abstraction layers System
layer(Virtual Machine abstraction of a server),Platform layer(A virtualized operating system, database and
webserver of a server and Application layer(It includes Web Applications).Denial of Service attack is an attempt
to make a machine or network resource unavailable to the intended user. In DOS a user or organization is
deprived of the services of a resource they would normally expect to have.A Successful DOS attack is a highly
noticeable event impacting the entire online user base.DOS attack is found by First Mathematical Metrical
Method (Rate Controlling,Timing Window,Worst Case and Pattern Matching)DOS attack not only affect the
Quality of the service and also affect the performance of the server. DDOS attacks are launched from Botnet-A
large Cluster of Connected device(cellphone,pc or router) infected with malware that allow remote control by an
attacker. Intruder using SIPDAS in DDOS to perform attack.SIPDAS attack strategies are detected using Heap
Space Monitoring Algorithm.
An improved fading Kalman filter in the application of BDS dynamic positioningIJRES Journal
Aiming at the poor dynamic performance and low navigation precision of traditional fading
Kalman filter in BDS dynamic positioning, an improved fading Kalman filter based on fading factor vector is
proposed. The fading factor is extended to a fading factor vector, and each element of the vector corresponds to
each state component. Based on the difference between the actual observed quantity and the predicted one, the
value of the vector is changed automatically. The memory length of different channel is changed in real time
according to the dynamic property of the corresponding state component. The actual observation data of BDS is
used to test the algorithm. The experimental results show that compared with the traditional fading Kalman filter
and the method of the third references, the positioning precision of the algorithm is improved by 46.3% and
23.6% respectively.
Positioning Error Analysis and Compensation of Differential Precision WorkbenchIJRES Journal
Positioning error is a widely problem exists in mechanism, the important factors affecting machining
precision. In order to reduce the error caused by positioning problem processing, based on the differential
workbench as the research object, using the method of theoretical analysis and experimental verification, the
analysis of positioning error mechanism and source of complete differential precision workbench error
compensation, improve the accuracy of the device, provides a method for the application of modern machine
tools. table.
Status of Heavy metal pollution in Mithi river: Then and NowIJRES Journal
The Mithi River runs through the heart of suburban Mumbai. Its path of flow has been severely
damaged due to industrialization and urbanization. The quality of water has been deteriorating ever since. The
Municipal and industrial effluents are discharged in unchecked amounts. The municipal discharge comprises
untreated domestic and sewage wastes whereas the industries are majorly discharge chemicals and other toxic
effluents which are responsible in increasing the metal load of the river. In the current study, the water is
analysed for heavy metals- Copper, Cadmium, Chromium, Lead and Nickel. It also includes a brief
understanding on the fluctuations that have occurred in the heavy metal pollution, through the compilation of
studies carried out in the area previously.
The Low-Temperature Radiant Floor Heating System Design and Experimental Stud...IJRES Journal
In order to analyze the temperature distribution of the low-temperature radiant floor heating system
that uses the condensing wall-hung boiler as the heat source, the heating system is designed according to a typical
house facing south in Shanghai. The experiments are carried out to study the effects of the supply water
temperature on the thermal comfort of the system. Eventually, the supply water temperature that makes people in
the room feel more comfortable is obtained. The result shows that in the condition of that the outside temperature
is 8~15℃ and the relative humidity is 30~70%RH, the temperature distribution in the room is from high to low
when the height is from bottom to top. The floor surface temperature is highest, but its uniformity is very poor.
When the heating system reaches the steady state, the air temperature of the room is uniform. When the supply
water temperature is 63℃ The room is relatively comfortable at the above experimental condition.
Experimental study on critical closing pressure of mudstone fractured reservoirsIJRES Journal
In the process of oil and gas exploitation of mudstone-fractured reservoir in Daqing oilfield, the
permeability of fracture is easily affected by the influence of stress change, which is shown by the sensitivity of
the permeability to the stress. With the extension of time mining in the fractured mudstone reservoir, fracture
stress sensitivity is obvious in vast decline of production and great influence on reduced yields. In order to
reasonably determine the way of developing method, working system and the exploitation rate of the reservoir,
correspondingly protecting reservoir productivity, improve ultimate recovery. On the basis of the previous
research on the stress sensitivity of fractured mudstone, this essay studied the critical closing pressure of the
simulated underground fractured mudstone under the laboratory condition.
Correlation Analysis of Tool Wear and Cutting Sound SignalIJRES Journal
With the classic signal analysis and processing method, the cutting of the audio signal in time
domain and frequency domain analysis. We reached the following conclusions: in the time domain analysis,
cutting audio signals mean and the variance associated with tool wear state change occurred did not change
significantly, and tool wear is not high degree of correlation, and the mean-square value of the audio signal
changes in the size and tool wear the state has a good relationship.
Reduce Resources for Privacy in Mobile Cloud Computing Using Blowfish and DSA...IJRES Journal
Mobile cloud computing in light of the increasing popularity among users of mobile smart
technology which is the next indispensable that enables users to take advantage of the storage cloud computing
services. However, mobile cloud computing, the migration of information on the cloud is reliable their privacy
and security issues. Moreover, mobile cloud computing has limitations in resources such as power energy,
processor, Memory and storage. In this paper, we propose a solution to the problem of privacy with saving and
reducing resources power energy, processor and Memory. This is done through data encryption in the mobile
cloud computing by symmetric algorithm and sent to the private cloud and then the data is encrypted again and
sent to the public cloud through Asymmetric algorithm. The experimental results showed after a comparison
between encryption algorithms less time and less time to decryption are as follows: Blowfish algorithm for
symmetric and the DSA algorithm for Asymmetric. The analysis results showed a significant improvement in
reducing the resources in the period of time and power energy consumption and processor.
Resistance of Dryland Rice to Stem Borer (Scirpophaga incertulas Wlk.) Using ...IJRES Journal
Rice stem borer is one of the important pests that attack plants so as to reduce production. One way
to control pests is to use organic fertilizers that make the plant stronger and healthier. This study was conducted
to determine the effects of organic fertilizers with various doses without the use of pesticides in controlling stem
borer, Scirpophaga incertulas. Methods using split-split plot design which consists of two levels of the whole
plot factor (solid and liquid organic fertilizers), two levels of the subplot factor (conventional and industry,
Tiens and Mitraflora), and four levels of the sub-subplot factor of conventional and industry (5, 10, 15, 20
tonnes/ha), and one level of the sub-subplot factor of Tiens and Mitraflora (each 2 ml/l). Based on the results
Statistical analysis there were no significant differences among treatments and this shows that the use of organic
fertilizers that only a dose of 5 tonnes/ha is sufficient available nutrients that make plants more robust and
resistant to control stem borer, besides that can reduce production costs and friendly to the environment when
compared with using inorganic fertilizers.
A novel high-precision curvature-compensated CMOS bandgap reference without u...IJRES Journal
A novel high-precision curvature-compensated bandgap reference (BGR) without using op-amp
is presented in this paper. It is based on second-order curvature correction principle, which is a weighted sum of
two voltage curves which have opposite curvature characteristic. One voltage curve is achieved by first-order
curvature-compensated bandgap reference (FCBGR) without using op-amp and the other found by using W
function is achieved by utilizing a positive temperature coefficient (TC) exponential current and a linear
negative TC current to flow a linear resistor. The exponential current is gained by using anegative TC voltage to
control a MOSFET in sub-threshold region. In the temperature ranging from -40℃ to 125℃, experimental
results implemented with SMIC 0.18μm CMOS process demonstrate that the presented BGR can achieve a TC
as low as 2.2 ppm/℃ and power-supply rejection ratio(PSRR)is -69 dB without any filtering capacitor at 2.0 V.
While the range of the supply voltage is from 1.7 to 3.0 V, the output voltage line regulation is about1 mV/ V
and the maximum TC is 3.4 ppm/℃.
Structural aspect on carbon dioxide capture in nanotubesIJRES Journal
In this work we reported the carbon dioxide adsorption (CO2) in six different nanostructures in order
to investigate the capturing capacity of the materials at nanoscale. Here we have considered the three different
nanotubes including zinc oxide nanotube (ZnONT), silicon carbide nanotube (SiCNT) and single walled carbon
nanotube (SWCNT). Three different chiralities such as zigzag (9,0), armchair (5,5) and chiral (6,4) having
approximately same diameter are analyzed. The adsorption binding energy values under various cases are
estimated with density functional theory (DFT). We observed CO2 molecule chemisorbed on ZnONT and
SiCNT’s whereas the physisorption is predominant in CNT. To investigate the structural aspect, the tubes with
defects are studied and compared with defect free tubes. We have also analyzed the electrical properties of tubes
from HOMO, LUMO energies. Our results reveal the defected structure enhance the CO2 capture and is
predicted to be a potential candidate for environmental applications.
Thesummaryabout fuzzy control parameters selected based on brake driver inten...IJRES Journal
In this paper, the brake driving intention identification parameters based on the fuzzy control are
summarized and analyzed, the necessary parameters based on the fuzzy control of the brake driving intention
recognition are found out, and I pointed out the commonly corrupt parameters, and through the relevant
parameters , I establish the corresponding driving intention model.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
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• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
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Runway Orientation Based on the Wind Rose Diagram.pptx
Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
1. International Journal of Research in Engineering and Science (IJRES)
ISSN (Online): 2320-9364, ISSN (Print): 2320-9356
www.ijres.org Volume 3 Issue 10 ǁ October. 2015 ǁ PP.45-51
www.ijres.org 45 | Page
Reducer intermodulation noise filter for Transmission Systems
Amplitude Modulation
1
C. AQUINO, 2
D. ZAMORANO, 3
C. AGUILAR
1
ESIME CULHUACAN, National Polytechnic Institute.
2
ESIME CULHUACAN, National Polytechnic Institute.
3
ESIME CULHUACAN, National Polytechnic Institute.
Abstract: - The intention of this article is to show the effects that intermodulation noise produce in Amplitude
Modulation Systems (AM Systems ) highlighting the importance of these systems for broadcasters.In addition it
also shows a reducing intermodulation noise filter for AM transmission systems, This filter works in an ideal
manner, for example, into the modulated signal that is contaminated by noise from effects of such modulation
the filter output and the modulated signal should appear with the magnitude of the almost imperceptible noise.
To verify that the output signal is the desired, measurements ODG (Objective Difference Grade) which is a
measure of quality based on PEAQ (Perceptual Evaluation of Audio Quality) obtaining an average value of -
0.482appears a result indicating a relatively imperceptible noise.
Keywords: Filter, Noise, intermodulation frequency.
I. INTRODUCTION
Currently the broadcasters that transmit through Amplitude Modulation technique have a problem that
has persisted over the time, adding an intermodulation noise caused by the same technique and which in turn
produces a perceptible auditory reception interference. Intermodulation noise is defined as energy generated by
the sums and differences created by the amplification of two or more frequencies in a nonlinear amplifier [1].
The carrier frequencies of amplitude modulation (AM) are in the frequency range of 535 kHz to 1605 kHz
leaving 5kHz as error margin at each end of the range, the carrier frequencies of 540 kHz to 1600 kHz are
allocated to 10 kHz [1].
The information signals are to be transported between a transmitter and a receiver via some form of
transmission. The modulation is defined as the process of transforming information from its original form to a
form suitable for transmission. Demodulation is the inverse process, that is, the modulated wave is converted
back to its original position [1]. The modulation is performed at the transmitter circuit called modulator and
demodulation is performed in the receiver in a demodulator or detector circuit.
Figure 1 shows a block diagram of a transmission –reception system.
Fig.1 Block diagram of an ideal Transmission System.
In figure 1 Intermodulation noise can be displayed upcoming from the transmission source. This noise is what
we want to analyze for its deletion in this article.
In section 2 the conceptual approaches relating to the subject of Amplitude Modulation are shown and in section
3 the development and design of the filter as a solution to the suppression of intermodulation noise.The results
of the filtering process are shown in section 4. Section 5 refers to the conclusions and evaluation of the proposed
objectives and finally in Section 6 it shows the consulting references.
II. CONCEPTUAL APPROXIMATIONS OR APPROACHES
This section describes the conceptual approaches related to the issue of amplitude modulation.
Baseband: We talk about baseband signal when the emitted messages are designated.
2. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 46 | Page
Bandwidth: The bandwidth of a signal is the extension of the frequencies over which the signal has a superior
power at certain limit. For amplitude modulation (AM) bandwidth is expressed in kHz.
Signal spectrum: Designates the distribution of signal power in the frequency domain and is sometimes called
Power Spectral Density (PSD). Then the equation defining the spectrum is shown like:
𝐷𝑆𝑃 = ℱ 𝑥 𝑡
2
Where:
DSP = power spectral density (frequency spectrum)
x (t) = the original signal in time domain
Amplitude Modulation: The process of changing the amplitude of relatively high frequency carrier according to
the amplitude of the modulating signal (information). Amplitude modulation is a form of modulation relatively
inexpensive and a low transmission quality generally used in the radio broadcast audio and video signals [2].
Radio frequencies: frequencies high enough to efficiently radiate an antenna and propagated through free space,
are commonly called RF.
Intermodulation noise: It happens when signals of different frequencies involved in the modulation process
share the same transmission via. It is regarded as unwanted cross-product frequencies (sum and difference)
created when two or more signals are amplified in a nonlinear device.
AM modulator is a nonlinear device that requires two input signals a carrier of constant amplitude and
frequency and only the information signal.
AM modulation process: modifies the information carrier and can be a waveform frequency of simple or
complex composed of many frequencies which were originated from one or more sources.
Signal to noise ratio (SNR): It is a mathematical ratio that measures the level of signal-to-noise level at a certain
point, mathematically:
𝑆
𝑅
=
𝑆𝑖𝑔𝑛𝑎𝑙𝑉𝑜𝑙𝑡𝑎𝑔𝑒
𝑁𝑜𝑖𝑠𝑒𝑉𝑜𝑙𝑡𝑎𝑔𝑒
2
=
𝑣 𝑆
𝑣 𝑁
2
or
𝑆
𝑁
𝑑𝐵 = 20 log
𝑉𝑠
𝑉 𝑁
𝑠
𝑅
=
𝑆𝑖𝑔𝑛𝑎𝑙𝑃𝑜𝑤𝑒𝑟
𝑁𝑜𝑖𝑠𝑒𝑃𝑜𝑤𝑒𝑟
2
=
𝑃𝑠
𝑃 𝑁
or
𝑆
𝑁
𝑑𝐵 = 10 log
𝑃 𝑆
𝑃 𝑁
Modulation ratio: Term used to describe the amount of change of amplitude (modulation) present in a waveform
of AM. It is expressed in percentage and provides the change in amplitude of the output waveform when it is
acting on the carrier by a modulating signal, mathematically:
𝑚 =
𝐸 𝑚
𝐸𝑐
where:
m = Modulation coefficient (dimensionless)
Em = Change in peak voltage amplitude of the output waveform (volts)
Ec = peak amplitude of the non-modulated carrier voltage (volts)
In figure 2 the existing amplitude modulations and respective modulation index is:
Fig. 2Amplitude Modulation. a) In the top 50% modulation of the carrier is displayed. b) In the middle of 100%
modulation shown because the carrier will be zero (deleted). c) The overshoot can be observed at the bottom and
corresponds to a 150% modulation index.
3. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 47 | Page
Then, where the proposed development of the electronic filter is displayed is shown.
III. DEVELOPMENT
The development of this work is divided into two main parts: assembly of the modulator circuit and reducing
filter design. We begin by mounting the AM modulator circuit which is based on the following diagram:
Fig. 3 AM modulator based on integrated circuit MC1496.
Figure 3 shows the electronic diagram of a typical AM modulator. Note that two input signals are
necessary; the first signal is a carrier frequency, the carrier frequency should be greater than the information
signal we want to convey and that the carrier will be our means of transport, the second signal is needed since it
is the modulator or modulating signal, this signal is the information to be transmitted and is usually the voice.
The bandwidth for AM frequencies in Mexico is defined by the range of 535 to 1705kHz [2].
The filter circuit is designed as low active component, conveniently are necessary components not requiring
external power and they also generate a power gain (essential parameter when transmitting). Table 1 showsthe
normalization parameters of the filter and that will help calculate the components involved in the filter.
Table 1. Standard values for calculating electrical parameters (capacitors and resistors)
4. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 48 | Page
The following chart will support the design of the filter because it will be the one to dictate what frequency must
pass the filter and which should be rejected.
Fig. 4 Graph of the frequency response, F1 and F2 are band pass filter cutoff frequency for example the
frequency range to be considered for design
.
To prevent intermodulation noise, at the modulator output prevails a band pass filter designed and this
will allow access to frequencies between the AM (535 to 1705kHz) spectrum. The band pass filter is composed
of two parts: a high pass filter, which has the cutoff frequency one F1 will be our lower limit access, for
example 535kHz and low pass filter with cutoff frequency F2 will be our upper limit access, i.e. 1705 kHz. Then
the equations to calculate the elements and the electronic design of the filter are:
𝑛 =
log
𝜀2
𝜀1
log
𝑓𝑝
𝑓𝑠
𝜀1 = 10 0.1∗𝐺 𝑝 − 1
𝜀2 = 10 0.1∗𝐺 𝑠 − 1
𝐶𝑛 =
1
2𝜋𝑓𝑝 𝑅
𝑤𝑒𝑟𝑒:
𝑛 = 𝑓𝑖𝑙𝑡𝑒𝑟𝑜𝑟𝑑𝑒𝑟
𝑓𝑠 = 𝑅𝑒𝑗𝑒𝑐𝑡𝑖𝑜𝑛𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 (𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦𝑟𝑎𝑛𝑔𝑒)
𝑓𝑝 = 𝑃𝑎𝑠𝑠𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 (𝑐𝑢𝑡𝑜𝑓𝑓𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦)
𝐺𝑝 = 𝐺𝑎𝑖𝑛𝑠𝑡𝑒𝑝
𝐺𝑠 = 𝑅𝑒𝑗𝑒𝑐𝑡𝑖𝑜𝑛𝑔𝑎𝑖𝑛
𝐶𝑛 = 𝑆𝑐𝑎𝑙𝑒𝑓𝑎𝑐𝑡𝑜𝑟
Electronic for designing filters are only two configurations [1]: second and third order because mixtures of these
devices we would yield larger orders, for example; if it is a filter of order seven could connect two
configurations of order two and a configuration of three series order so that together form the order seven.
Fig. 5 active filters respectively second and third order
Then filter design will be displayed, we begin to show the graph of the frequency response which will be
designed the filter and go from there to make the necessary calculations.According to the theory of AM [4]
modulation range of allowable frequencies it is from 535 kHz up to 1705 kHz so take that frequency range and
5. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 49 | Page
each end is the rejection frequency, ie that for over 1705 frequencies kHz step is prevented and frequencies
below 535 kHz are also inadmissible
Fig. 6 filter frequency response proposed
A band pass [3] filter is designed by two filters, one high pass and one low pass connected in series.
The high pass filter it will be as shown in the figure:
Fig. 7 highpass filter (half of the total filter)
The low pass filter will be as shown in the figure.
FIG. 8 low pass filter (half band pass filter)
The total band pass filter is the series connection of the low-pass and high-pass to the output of the AM
modulator (since at this stage is where the intermodulation noise occurs)
To verify that the filter was audibly and effectively functioning the following scheme was implemented based
on PEAQ established by the International Telecommunications Union. This process is performed by calculating
a correlation of the signal obtained from the expected signal.
FIG. 9 Schemeproposed PEAQ
Table 2. Comparative metrics of the original signal to the expected
Perception Grade PEAQ
Imperceptible 0 a -1
Slightly perceptible -1.1 a -2
Perceptible -2.1 a -3
Very perceptible -3.1 a -4
6. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 50 | Page
Below are the results of the modulation stages and the filtrate.
IV. RESULTS
The following figures show the results that appeared in the scope while implementing the amplitude modulator
circuit (AM modulator)
FIG. 9 Amplitude Modulation suppressed carrier (n = 1)
FIG. 10 amplitude modulated high power
(n = 0.5)
FIG. 11 Amplitude Modulation with overshoot (n = 1.5)
7. Reducer intermodulation noise filter for Transmission Systems Amplitude Modulation
www.ijres.org 51 | Page
FIG. 11 Response band pass filter
V. CONCLUSIONS
The band pass filters are formed by two filters: a high pass and a low pass connected in series, for
example one after the other.
In this project we do not consider the ripple factor as it is being considered onlyfor ideal answers of modulation
and filtering, so that is why these calculations do not appear within the work
The values of the electronic devices used are not exactly what we use in the actual implementation due to non-
market values, so we decided to bring them closer to the values that are tradable and that may be for sale
Intermodulation noise is a problem that has been afflicting mainly AM modulation schemes because of their
vulnerability.
BIBLIOGRAPHIC REFERENCES
[1]. Couch W. Leon, "Digital Communication Systems and Analog”, 7ª Edition, Prentice Hall.
[2]. Chen-hao Qi, et. al., “Hybrid Modulation for AM Broadcasting”, Third International Conference on
Natural Computation, 2007
[3]. Ghoshal, S., et. al., “Modeling amplitude-modulated (AM) tone encoding behavior of cochlear nucleus
neurons”, Seventeenth Annual Northeast Bioengineering Conference, 2005
[4]. Fahmi Bin, Hussin, Bin Yon, “Readability of Amplitude Modulation (AM) detector laboratory sheet,
International RF and Microwave Conference, 2011
AUTHOR PROFILE:
Carlos Aquino Ruiz was born in Mexico on April 2, 1973 is in Communications and
Electronics Engineering from the National Polytechnic Institute IPN, a research professor and
areas of development are applied computing, data networking and security.
Dolores Zamorano Saavedra. She is a methodological research and has master's degree in
Educational Sciences. Nowadays it is a research professor at the School of Mechanical and
Electrical Engineering (ESIME) in Mexico. Her areas of development are assessment and
project development, scientific writing and methodology of science
Celedonio Enrique Aguilar Meza was born in Mexico on march 3, 1959 and holds a degree
in communications and electronics from the National Polytechnic Institute IPN, is currently
research professor and development areas are the processing and handling, coding and
compression, safety and efficient transmission.