The document proposes a weighted filter bank analysis (WFBA) scheme to derive robust mel frequency cepstral coefficients (MFCCs) for speech recognition. The WFBA emphasizes the peaks of log filter bank energies while attenuating lower energies. Two weighting functions are investigated. Experimental results on a Mandarin speech database show the WFBA-based features have better discriminative ability and provide higher syllable recognition rates than standard MFCCs and other schemes in noisy and channel-distorted conditions. The direct WFBA requires less computation than an alternative using a fuzzy membership weighting function.
This document presents a new method for creating robust speech features based on linear predictive coding (LPC) for noisy speech recognition. The method applies a weighted arcsine transform to the autocorrelation sequence (ACS) of each speech frame. This transform uses an SNR-dependent smoothing factor to more heavily smooth segments with lower SNR. It also weights each ACS component by the inverse of the average magnitude difference function (AMDF) to emphasize spectral peaks. Experimental results on Mandarin digit recognition show the new LPC features are more noise robust than conventional LPC features over a wide range of SNRs.
TIME-DOMAIN MODELING OF ELECTROMAGNETIC WAVE PROPAGATION IN COMPLEX MATERIALS...John Paul
This document describes time-domain modeling of electromagnetic wave propagation in complex materials using the Transmission-Line Modeling (TLM) method. The formulation is derived from Maxwell's equations and constitutive relations using bilinear Z-transform methods. This approach can model anisotropic, bianisotropic, and frequency-dependent linear materials. Two examples are presented to validate the approach: plane wave reflection/transmission in an isotropic chiral slab, and reflectivity of a uniaxial chiral material. Close agreement with frequency-domain analyses demonstrates the method can accurately model problems without analytic solutions.
A Novel CAZAC Sequence Based Timing Synchronization Scheme for OFDM SystemIJAAS Team
Several classical timing synchronization schemes have been proposed for the timing synchronization in OFDM systems based on the correlation between identical parts of OFDM symbol. These schemes show poor performance due to the presence of plateau and significant side lobe. In this paper we present a timing synchronization schemes with timing metric based on a Constant Amplitude Zero Auto Correlation (CAZAC) sequence. The performance of the proposed timing synchronization scheme is better than the classical techniques.
A novel particle swarm optimization for papr reduction of ofdm systemsaliasghar1989
This document summarizes a research paper that proposes a new particle swarm optimization (PPSO) technique to reduce the computational complexity of the original PSO (OPSO) method for phase optimization in partial transmit sequence (PTS) peak-to-average power ratio (PAPR) reduction schemes for orthogonal frequency division multiplexing (OFDM) systems. Simulation results show that PPSO achieves nearly the same PAPR performance as OPSO but with lower complexity, as it removes the need for random variables and exhaustive searching in phase factor selection for PTS. The complexity is reduced further as the number of particle generations and sub-blocks increases.
TIME-DOMAIN SIMULATION OF ELECTROMAGNETIC WAVE PROPAGATION IN A MAGNETIZED PL...John Paul
This document describes a time-domain transmission-line model for simulating electromagnetic wave propagation in a magnetized plasma. It discretizes the anisotropic Lorentzian conductivity function using bilinear Z-transforms for improved accuracy. It validates the model by comparing results to an analytic solution and applies it to simulate ionospheric propagation, including the dispersion of a pulse into a whistler wave.
GLOTTAL CLOSURE INSTANT DETECTION USING LINES OF MAXIMUM AMPLITUDES (LOMA) OF...François Rigaud
1) The Lines of Maximum Amplitude (LOMA) method uses wavelet transform modulus maxima to detect glottal closure instants (GCIs). It builds lines chaining local maxima across wavelet scales and selects the optimal line for each pitch period using backtracking.
2) The LOMA method was evaluated against the DYPSA algorithm and EGG reference data on synthetic and natural speech corpora. Results showed LOMA was more accurate than DYPSA for varying glottal parameters but less accurate for large pitch variations.
3) On natural speech, LOMA, DYPSA, and LPC-LOMA had similar performance with standard deviations around 600 microseconds compared to
This document presents results from a lattice QCD calculation of the proton isovector scalar charge (gs) at two light quark masses. The calculation uses domain-wall fermions and Iwasaki gauge actions on a 323x64 lattice with a spacing of 0.144 fm. Ratios of three-point to two-point correlation functions are formed and fit to a plateau to extract gs. Values of gs are obtained for quark masses of 0.0042 and 0.001, and all-mode averaging is used for the lighter mass. Chiral perturbation theory will be used to extrapolate gs to the physical quark mass. Preliminary results for gs at the unphysical quark masses are reported in lattice units.
An agent based particle swarm optimization for papr reduction of ofdm systemsaliasghar1989
This document proposes an agent-based particle swarm optimization (APSO) algorithm to reduce the computational complexity of the original particle swarm optimization (OPSO) technique for partial transmit sequence (PTS) peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. Simulation results show that APSO achieves nearly the same PAPR reduction performance as OPSO but with significantly lower complexity, as the number of additions and multiplications is reduced by setting the velocity of all particles equal to the velocity of the agent particle in each iteration. APSO is thus an effective method to solve the phase optimization problem in PTS with lower complexity than OPSO.
This document presents a new method for creating robust speech features based on linear predictive coding (LPC) for noisy speech recognition. The method applies a weighted arcsine transform to the autocorrelation sequence (ACS) of each speech frame. This transform uses an SNR-dependent smoothing factor to more heavily smooth segments with lower SNR. It also weights each ACS component by the inverse of the average magnitude difference function (AMDF) to emphasize spectral peaks. Experimental results on Mandarin digit recognition show the new LPC features are more noise robust than conventional LPC features over a wide range of SNRs.
TIME-DOMAIN MODELING OF ELECTROMAGNETIC WAVE PROPAGATION IN COMPLEX MATERIALS...John Paul
This document describes time-domain modeling of electromagnetic wave propagation in complex materials using the Transmission-Line Modeling (TLM) method. The formulation is derived from Maxwell's equations and constitutive relations using bilinear Z-transform methods. This approach can model anisotropic, bianisotropic, and frequency-dependent linear materials. Two examples are presented to validate the approach: plane wave reflection/transmission in an isotropic chiral slab, and reflectivity of a uniaxial chiral material. Close agreement with frequency-domain analyses demonstrates the method can accurately model problems without analytic solutions.
A Novel CAZAC Sequence Based Timing Synchronization Scheme for OFDM SystemIJAAS Team
Several classical timing synchronization schemes have been proposed for the timing synchronization in OFDM systems based on the correlation between identical parts of OFDM symbol. These schemes show poor performance due to the presence of plateau and significant side lobe. In this paper we present a timing synchronization schemes with timing metric based on a Constant Amplitude Zero Auto Correlation (CAZAC) sequence. The performance of the proposed timing synchronization scheme is better than the classical techniques.
A novel particle swarm optimization for papr reduction of ofdm systemsaliasghar1989
This document summarizes a research paper that proposes a new particle swarm optimization (PPSO) technique to reduce the computational complexity of the original PSO (OPSO) method for phase optimization in partial transmit sequence (PTS) peak-to-average power ratio (PAPR) reduction schemes for orthogonal frequency division multiplexing (OFDM) systems. Simulation results show that PPSO achieves nearly the same PAPR performance as OPSO but with lower complexity, as it removes the need for random variables and exhaustive searching in phase factor selection for PTS. The complexity is reduced further as the number of particle generations and sub-blocks increases.
TIME-DOMAIN SIMULATION OF ELECTROMAGNETIC WAVE PROPAGATION IN A MAGNETIZED PL...John Paul
This document describes a time-domain transmission-line model for simulating electromagnetic wave propagation in a magnetized plasma. It discretizes the anisotropic Lorentzian conductivity function using bilinear Z-transforms for improved accuracy. It validates the model by comparing results to an analytic solution and applies it to simulate ionospheric propagation, including the dispersion of a pulse into a whistler wave.
GLOTTAL CLOSURE INSTANT DETECTION USING LINES OF MAXIMUM AMPLITUDES (LOMA) OF...François Rigaud
1) The Lines of Maximum Amplitude (LOMA) method uses wavelet transform modulus maxima to detect glottal closure instants (GCIs). It builds lines chaining local maxima across wavelet scales and selects the optimal line for each pitch period using backtracking.
2) The LOMA method was evaluated against the DYPSA algorithm and EGG reference data on synthetic and natural speech corpora. Results showed LOMA was more accurate than DYPSA for varying glottal parameters but less accurate for large pitch variations.
3) On natural speech, LOMA, DYPSA, and LPC-LOMA had similar performance with standard deviations around 600 microseconds compared to
This document presents results from a lattice QCD calculation of the proton isovector scalar charge (gs) at two light quark masses. The calculation uses domain-wall fermions and Iwasaki gauge actions on a 323x64 lattice with a spacing of 0.144 fm. Ratios of three-point to two-point correlation functions are formed and fit to a plateau to extract gs. Values of gs are obtained for quark masses of 0.0042 and 0.001, and all-mode averaging is used for the lighter mass. Chiral perturbation theory will be used to extrapolate gs to the physical quark mass. Preliminary results for gs at the unphysical quark masses are reported in lattice units.
An agent based particle swarm optimization for papr reduction of ofdm systemsaliasghar1989
This document proposes an agent-based particle swarm optimization (APSO) algorithm to reduce the computational complexity of the original particle swarm optimization (OPSO) technique for partial transmit sequence (PTS) peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. Simulation results show that APSO achieves nearly the same PAPR reduction performance as OPSO but with significantly lower complexity, as the number of additions and multiplications is reduced by setting the velocity of all particles equal to the velocity of the agent particle in each iteration. APSO is thus an effective method to solve the phase optimization problem in PTS with lower complexity than OPSO.
Nucleation III: Phase-field crystal modeling of nucleation processDaniel Wheeler
This document summarizes research on modeling nucleation processes using phase-field crystal modeling. It begins with an introduction to complex polycrystalline structures that form through nucleation and growth processes. It then provides an overview of the phase-field crystal approach and how it can be used to model nucleation and growth dynamics. Specific applications discussed include modeling homogeneous and heterogeneous nucleation barriers using the Euler-Lagrange method and simulating non-equilibrium nucleation processes using the diffusive phase-field crystal model. The document highlights how phase-field crystal modeling can provide insights into precursor structures, growth morphologies, and freezing mechanisms observed in experiments.
This document summarizes the design of an optimal discrete Fourier transform (DFT) modulated filter bank with a sharp transition band. It formulates the filter bank design as a non-linear optimization problem. To reduce complexity, it develops a frequency response masking (FRM) technique. The FRM technique uses an interpolated base linear phase filter and masking filters to provide a narrow transition band for the prototype filter while reducing the complexity and filter length. The document presents different cases for applying the FRM technique and analyzes how the filter lengths and number of coefficients are affected based on the transition width and other filter parameters.
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.
An improved dft based channel estimationsakru naik
This document proposes an improved DFT-based channel estimation method for MIMO-OFDM systems. The conventional DFT method causes energy leakage in non-sample-spaced multipath channels. The improved method extends the LS estimate using symmetry, calculates the changing rate of leakage energy, and selects useful paths based on this rate to reduce leakage energy. Simulation results show the improved method reduces leakage energy more efficiently and provides better channel estimation performance than LS and conventional DFT algorithms.
This report is a re-evaluation on DMF as derived in conventional books and as we have used to derive. The report shows in details about the changes in values obtained.
Phase-field modeling of crystal nucleation: Comparison with simulations and e...PFHub PFHub
The document summarizes a talk on phase-field modeling of crystal nucleation. It compares simulations using single-field phase-field models to molecular dynamics simulations and experiments for various materials. For nickel, water, and a Lennard-Jones system, the "standard" phase-field model agrees well with the simulations and experiments. However, for a hard-sphere system, a different phase-field model based on Ginzburg-Landau theory is needed. Further theoretical work is required to develop phase-field models that can accurately describe crystal nucleation across different materials.
Papr reduction for ofdm oqam signals via alternative signal methodeSAT Journals
Abstract
We deemed the PAPR reduction problem for OFDM/OQAM system. The PAPR reduction is the serious problem for
implementations of both OFDM and OFDM/OQAM systems due to their high PAPR. The OFDM/OQAM signal is generated by
summing over M time-shifted OFDM/OQAM symbols, where the successive symbols are interdependent with each other. The AS
(Alternative-Signal) method directly leads to the independent AS (AS-I) and joint AS (AS-J) algorithms. The AS-I algorithm
reduces the PAPR symbol by symbol with low complexity and AS-J applies optimal joint PAPR reduction among M
OFDM/OQAM symbols with much higher complexity. A sequential optimization procedure denoted AS-S have been proposed to
balance the computation complexity and system performance in this paper. AS-S algorithm, which adopts a sequential
optimization procedure over time with computational complexity linearly increasing with M. The Simulation results have been
provided for performance comparison of AS-I, AS-J, and AS-S algorithms.
Keywords—Peak-to-Average power ratio (PAPR), orthogonal frequency division multiplexing with offset quadrature
amplitude modulation (OFDM/OQAM), Alternative-signal(AS),cyclic prefix(CP).
Nucleation III: Phase-field crystal modeling of nucleation processPFHub PFHub
The document summarizes research on modeling nucleation processes using phase-field crystal modeling. It discusses how phase-field crystal models can capture nucleation and growth phenomena observed in experiments and atomistic simulations. Specifically, it describes how different phase-field crystal models are able to simulate:
1) Homogeneous and heterogeneous nucleation processes in 2D and 3D, including the effects of lattice mismatch and particle-induced nucleation.
2) Continuous cooling simulations that show amorphous phase formation prior to crystallization, similar to experimental observations in colloids.
3) Instantaneous quenching simulations that produce amorphous clusters and domains that facilitate heterogeneous nucleation of body-centered cubic crystals.
4
Convergence Behaviour of Newton-Raphson Method in Node- and Loop-Based Non-li...balaganesh boomiraja
A simplified Jacobian is derived for both node- and loop-based magnetic equivalent circuit analysis. The partial derivative term is eliminated in this simplified Jacobian using differential relative permeability. The convergence behaviour of the Newton-Raphson method is studied. The loop analysis exhibits more stable convergence than that of the node analysis while solving non-linear magnetic equivalent circuit using the Newton-Raphson method.
Phase-field modeling of crystal nucleation II: Comparison with simulations an...Daniel Wheeler
This document summarizes phase-field modeling of crystal nucleation. It discusses:
1) Homogeneous nucleation models using the phase-field method and their comparison to molecular dynamics simulations and experiments for systems like nickel and Lennard-Jones argon.
2) Applications of the phase-field model to heterogeneous systems like ice-water nucleation.
3) The effects of different double-well and interpolation functions on nucleation behavior in phase-field models.
Phase-field modeling of crystal nucleation I: Fundamentals and methodsDaniel Wheeler
This document summarizes phase-field modeling of homogeneous crystal nucleation using two main methods. The first method adds fluctuations (noise) to the phase-field equations of motion to mimic natural nucleation. The noise amplitude is determined by the fluctuation-dissipation theorem. This models nucleation without assuming a sharp interface or bulk properties. The second method places supercritical crystal seeds randomly in space and time to model nucleation. Quantitative results from both methods are difficult to obtain due to limitations of classical nucleation theory. The document outlines the phase-field model and equations used to simulate homogeneous nucleation and crystal growth in 2D with and without noise to demonstrate convergence with spatial and temporal discretization.
Non-Extended Schemes for Inter-SubchannelShih-Chi Liao
The document proposes a new efficient algorithm for reducing inter-subchannel interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems without extending the duration of time-domain signals. Previous algorithms extended signal duration to add diversity and reduce ICI, but this increased time variation within blocks. The proposed algorithm reduces the number of transmitted symbols within a block, periodically extends the shortened block to the original size, and applies combining coefficients at the receiver to completely remove ICI when channel variation is linear over the block. Simulation results show it outperforms previous algorithms that extend signal duration in high-mobility channels.
Tomography is important for network design and routing optimization. Prior approaches require either
precise time synchronization or complex cooperation. Furthermore, active tomography consumes explicit
probing resulting in limited scalability. To address the first issue we propose a novel Delay Correlation
Estimation methodology named DCE with no need of synchronization and special cooperation. For the
second issue we develop a passive realization mechanism merely using regular data flow without explicit
bandwidth consumption. Extensive simulations in OMNeT++ are made to evaluate its accuracy where we
show that DCE measurement is highly identical with the true value. Also from test result we find that
mechanism of passive realization is able to achieve both regular data transmission and purpose of
tomography with excellent robustness versus different background traffic and package size.
1) The document discusses a model for constraining the evolution of supermassive black holes through solving the continuity equation, using observational data on quasar luminosity functions and scaling relations between black hole mass and galaxy properties.
2) The model assumes parametric forms for the duty cycle of active black holes, Eddington ratio distribution as a function of redshift, and solves the continuity equation backwards in time using the local black hole mass function as a boundary condition.
3) The best-fit model reproduces observational data on luminosity functions and mass functions of active black holes, and implies an anti-hierarchical growth of black holes with cosmic downsizing. The model can constrain the radiative efficiency and favors values around 5-10
Investigation of Steady-State Carrier Distribution in CNT Porins in Neuronal ...Kyle Poe
In this work, the carrier distribution of a carbon nanotube inserted into the spinal ganglion neuronal membrane is examined. After primary characterization based on previous work, the nanotube is approximated as a one-dimensional system, and the Poisson and Schrödinger equations are solved using an iterative finite-difference scheme. It was found that carriers aggregate near the center of the tube, with a negative carrier density of ⟨ρn⟩ = 7.89 × 10^13 cm−3 and positive carrier density of ⟨ρp⟩ = 3.85 × 10^13 cm−3. In future work, the erratic behavior of convergence will be investigated.
Theoretical and Applied Phase-Field: Glimpses of the activities in IndiaDaniel Wheeler
1. The document summarizes recent work on phase-field modeling from several research groups in India.
2. It describes applications of phase-field modeling to spinodal decomposition, grain growth, precipitate evolution, and multi-phase solidification.
3. It highlights a recent study by the author using phase-field modeling to predict the equilibrium shapes of coherent precipitates under the influence of elastic stresses. The model accounts for elastic anisotropy and different eigenstrain configurations.
1) The document discusses modeling of various material parameters such as dielectric constant, bandgap, electron affinity, effective masses, and mobility as functions of composition in semiconductor alloys. It also discusses modeling of fields, recombination, carrier transport, and excess carriers in semiconductor heterojunctions.
2) Equations are provided for modeling parameters like cutoff frequency and capacitance-voltage characteristics of semiconductor diodes and transistors.
3) The relationships between material grading and device characteristics such as current-voltage behavior in diodes are examined.
ASP video contest about strategic planning and common mistakes to avoid when doing strategic planning. Contest opens May 15 - July 15. Voting open to all - ends July 31. Prizes awarded on or before September 15.
UW College of Arts & Sciences '09 - '10Jacob Lambert
This document celebrates the accomplishments of the 2009-2010 academic year, highlighting numerous faculty, students, and alumni who received prestigious awards and honors for their work and leadership in fields such as biology, chemistry, poetry, engineering, athletics, and more. It also recognizes accomplishments such as archaeological excavations in Israel, drama performances at the Edinburgh Festival Fringe, and visits from foreign dignitaries. Overall, it summarizes a year of excellence and innovation across the university.
The document is a notice and proxy statement for the annual meeting of stockholders of Norfolk Southern Corporation to be held on May 14, 2009. It provides information on voting procedures, the proposals to be voted on which include the election of directors and ratification of auditors, and summaries of director and executive compensation. Stockholders are requested to vote by proxy prior to the meeting.
The document presents research comparing the BD-SIIT and NAT-PT transition methods for migrating from IPv4 to IPv6 networks. It discusses the methodology, operation, and limitations of both BD-SIIT, a stateless translator, and NAT-PT, a stateful translator. The research aims to evaluate the performance of BD-SIIT and determine if it has lower overhead and cost compared to NAT-PT for network transitions.
Nucleation III: Phase-field crystal modeling of nucleation processDaniel Wheeler
This document summarizes research on modeling nucleation processes using phase-field crystal modeling. It begins with an introduction to complex polycrystalline structures that form through nucleation and growth processes. It then provides an overview of the phase-field crystal approach and how it can be used to model nucleation and growth dynamics. Specific applications discussed include modeling homogeneous and heterogeneous nucleation barriers using the Euler-Lagrange method and simulating non-equilibrium nucleation processes using the diffusive phase-field crystal model. The document highlights how phase-field crystal modeling can provide insights into precursor structures, growth morphologies, and freezing mechanisms observed in experiments.
This document summarizes the design of an optimal discrete Fourier transform (DFT) modulated filter bank with a sharp transition band. It formulates the filter bank design as a non-linear optimization problem. To reduce complexity, it develops a frequency response masking (FRM) technique. The FRM technique uses an interpolated base linear phase filter and masking filters to provide a narrow transition band for the prototype filter while reducing the complexity and filter length. The document presents different cases for applying the FRM technique and analyzes how the filter lengths and number of coefficients are affected based on the transition width and other filter parameters.
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.
An improved dft based channel estimationsakru naik
This document proposes an improved DFT-based channel estimation method for MIMO-OFDM systems. The conventional DFT method causes energy leakage in non-sample-spaced multipath channels. The improved method extends the LS estimate using symmetry, calculates the changing rate of leakage energy, and selects useful paths based on this rate to reduce leakage energy. Simulation results show the improved method reduces leakage energy more efficiently and provides better channel estimation performance than LS and conventional DFT algorithms.
This report is a re-evaluation on DMF as derived in conventional books and as we have used to derive. The report shows in details about the changes in values obtained.
Phase-field modeling of crystal nucleation: Comparison with simulations and e...PFHub PFHub
The document summarizes a talk on phase-field modeling of crystal nucleation. It compares simulations using single-field phase-field models to molecular dynamics simulations and experiments for various materials. For nickel, water, and a Lennard-Jones system, the "standard" phase-field model agrees well with the simulations and experiments. However, for a hard-sphere system, a different phase-field model based on Ginzburg-Landau theory is needed. Further theoretical work is required to develop phase-field models that can accurately describe crystal nucleation across different materials.
Papr reduction for ofdm oqam signals via alternative signal methodeSAT Journals
Abstract
We deemed the PAPR reduction problem for OFDM/OQAM system. The PAPR reduction is the serious problem for
implementations of both OFDM and OFDM/OQAM systems due to their high PAPR. The OFDM/OQAM signal is generated by
summing over M time-shifted OFDM/OQAM symbols, where the successive symbols are interdependent with each other. The AS
(Alternative-Signal) method directly leads to the independent AS (AS-I) and joint AS (AS-J) algorithms. The AS-I algorithm
reduces the PAPR symbol by symbol with low complexity and AS-J applies optimal joint PAPR reduction among M
OFDM/OQAM symbols with much higher complexity. A sequential optimization procedure denoted AS-S have been proposed to
balance the computation complexity and system performance in this paper. AS-S algorithm, which adopts a sequential
optimization procedure over time with computational complexity linearly increasing with M. The Simulation results have been
provided for performance comparison of AS-I, AS-J, and AS-S algorithms.
Keywords—Peak-to-Average power ratio (PAPR), orthogonal frequency division multiplexing with offset quadrature
amplitude modulation (OFDM/OQAM), Alternative-signal(AS),cyclic prefix(CP).
Nucleation III: Phase-field crystal modeling of nucleation processPFHub PFHub
The document summarizes research on modeling nucleation processes using phase-field crystal modeling. It discusses how phase-field crystal models can capture nucleation and growth phenomena observed in experiments and atomistic simulations. Specifically, it describes how different phase-field crystal models are able to simulate:
1) Homogeneous and heterogeneous nucleation processes in 2D and 3D, including the effects of lattice mismatch and particle-induced nucleation.
2) Continuous cooling simulations that show amorphous phase formation prior to crystallization, similar to experimental observations in colloids.
3) Instantaneous quenching simulations that produce amorphous clusters and domains that facilitate heterogeneous nucleation of body-centered cubic crystals.
4
Convergence Behaviour of Newton-Raphson Method in Node- and Loop-Based Non-li...balaganesh boomiraja
A simplified Jacobian is derived for both node- and loop-based magnetic equivalent circuit analysis. The partial derivative term is eliminated in this simplified Jacobian using differential relative permeability. The convergence behaviour of the Newton-Raphson method is studied. The loop analysis exhibits more stable convergence than that of the node analysis while solving non-linear magnetic equivalent circuit using the Newton-Raphson method.
Phase-field modeling of crystal nucleation II: Comparison with simulations an...Daniel Wheeler
This document summarizes phase-field modeling of crystal nucleation. It discusses:
1) Homogeneous nucleation models using the phase-field method and their comparison to molecular dynamics simulations and experiments for systems like nickel and Lennard-Jones argon.
2) Applications of the phase-field model to heterogeneous systems like ice-water nucleation.
3) The effects of different double-well and interpolation functions on nucleation behavior in phase-field models.
Phase-field modeling of crystal nucleation I: Fundamentals and methodsDaniel Wheeler
This document summarizes phase-field modeling of homogeneous crystal nucleation using two main methods. The first method adds fluctuations (noise) to the phase-field equations of motion to mimic natural nucleation. The noise amplitude is determined by the fluctuation-dissipation theorem. This models nucleation without assuming a sharp interface or bulk properties. The second method places supercritical crystal seeds randomly in space and time to model nucleation. Quantitative results from both methods are difficult to obtain due to limitations of classical nucleation theory. The document outlines the phase-field model and equations used to simulate homogeneous nucleation and crystal growth in 2D with and without noise to demonstrate convergence with spatial and temporal discretization.
Non-Extended Schemes for Inter-SubchannelShih-Chi Liao
The document proposes a new efficient algorithm for reducing inter-subchannel interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems without extending the duration of time-domain signals. Previous algorithms extended signal duration to add diversity and reduce ICI, but this increased time variation within blocks. The proposed algorithm reduces the number of transmitted symbols within a block, periodically extends the shortened block to the original size, and applies combining coefficients at the receiver to completely remove ICI when channel variation is linear over the block. Simulation results show it outperforms previous algorithms that extend signal duration in high-mobility channels.
Tomography is important for network design and routing optimization. Prior approaches require either
precise time synchronization or complex cooperation. Furthermore, active tomography consumes explicit
probing resulting in limited scalability. To address the first issue we propose a novel Delay Correlation
Estimation methodology named DCE with no need of synchronization and special cooperation. For the
second issue we develop a passive realization mechanism merely using regular data flow without explicit
bandwidth consumption. Extensive simulations in OMNeT++ are made to evaluate its accuracy where we
show that DCE measurement is highly identical with the true value. Also from test result we find that
mechanism of passive realization is able to achieve both regular data transmission and purpose of
tomography with excellent robustness versus different background traffic and package size.
1) The document discusses a model for constraining the evolution of supermassive black holes through solving the continuity equation, using observational data on quasar luminosity functions and scaling relations between black hole mass and galaxy properties.
2) The model assumes parametric forms for the duty cycle of active black holes, Eddington ratio distribution as a function of redshift, and solves the continuity equation backwards in time using the local black hole mass function as a boundary condition.
3) The best-fit model reproduces observational data on luminosity functions and mass functions of active black holes, and implies an anti-hierarchical growth of black holes with cosmic downsizing. The model can constrain the radiative efficiency and favors values around 5-10
Investigation of Steady-State Carrier Distribution in CNT Porins in Neuronal ...Kyle Poe
In this work, the carrier distribution of a carbon nanotube inserted into the spinal ganglion neuronal membrane is examined. After primary characterization based on previous work, the nanotube is approximated as a one-dimensional system, and the Poisson and Schrödinger equations are solved using an iterative finite-difference scheme. It was found that carriers aggregate near the center of the tube, with a negative carrier density of ⟨ρn⟩ = 7.89 × 10^13 cm−3 and positive carrier density of ⟨ρp⟩ = 3.85 × 10^13 cm−3. In future work, the erratic behavior of convergence will be investigated.
Theoretical and Applied Phase-Field: Glimpses of the activities in IndiaDaniel Wheeler
1. The document summarizes recent work on phase-field modeling from several research groups in India.
2. It describes applications of phase-field modeling to spinodal decomposition, grain growth, precipitate evolution, and multi-phase solidification.
3. It highlights a recent study by the author using phase-field modeling to predict the equilibrium shapes of coherent precipitates under the influence of elastic stresses. The model accounts for elastic anisotropy and different eigenstrain configurations.
1) The document discusses modeling of various material parameters such as dielectric constant, bandgap, electron affinity, effective masses, and mobility as functions of composition in semiconductor alloys. It also discusses modeling of fields, recombination, carrier transport, and excess carriers in semiconductor heterojunctions.
2) Equations are provided for modeling parameters like cutoff frequency and capacitance-voltage characteristics of semiconductor diodes and transistors.
3) The relationships between material grading and device characteristics such as current-voltage behavior in diodes are examined.
ASP video contest about strategic planning and common mistakes to avoid when doing strategic planning. Contest opens May 15 - July 15. Voting open to all - ends July 31. Prizes awarded on or before September 15.
UW College of Arts & Sciences '09 - '10Jacob Lambert
This document celebrates the accomplishments of the 2009-2010 academic year, highlighting numerous faculty, students, and alumni who received prestigious awards and honors for their work and leadership in fields such as biology, chemistry, poetry, engineering, athletics, and more. It also recognizes accomplishments such as archaeological excavations in Israel, drama performances at the Edinburgh Festival Fringe, and visits from foreign dignitaries. Overall, it summarizes a year of excellence and innovation across the university.
The document is a notice and proxy statement for the annual meeting of stockholders of Norfolk Southern Corporation to be held on May 14, 2009. It provides information on voting procedures, the proposals to be voted on which include the election of directors and ratification of auditors, and summaries of director and executive compensation. Stockholders are requested to vote by proxy prior to the meeting.
The document presents research comparing the BD-SIIT and NAT-PT transition methods for migrating from IPv4 to IPv6 networks. It discusses the methodology, operation, and limitations of both BD-SIIT, a stateless translator, and NAT-PT, a stateful translator. The research aims to evaluate the performance of BD-SIIT and determine if it has lower overhead and cost compared to NAT-PT for network transitions.
This document studied the dissolved oxygen levels of the Krishna River in Maharashtra, India at two sampling stations over the course of 2010. Dissolved oxygen was measured using the iodometric technique. Results found dissolved oxygen levels ranged from 5.2 to 7.4 mg/L over the months sampled, within acceptable levels to support aquatic life. Higher dissolved oxygen in winter was likely due to more favorable conditions for photosynthesis. Dissolved oxygen is an important water quality parameter and indicator of biological and physical processes in the water.
This document presents a new approach to modeling speech spectra and pitch for text-independent speaker identification using Gaussian mixture models based on multi-space probability distribution (MSD-GMM). The MSD-GMM allows modeling of continuous pitch values for voiced frames and discrete symbols representing unvoiced frames in a unified framework. Spectral and pitch features are jointly modeled by a two-stream MSD-GMM. Maximum likelihood estimation formulae are derived for the MSD-GMM parameters. Experimental results show the MSD-GMM can efficiently model spectral and pitch features of each speaker and outperforms conventional speaker models.
Employee engagement is strongly linked to financial performance, with companies that communicate effectively to employees obtaining higher engagement levels. An outsourced employee TV network solution can help companies communicate important information to employees through various content like employee recognition, training videos, company updates and special events. This solution eliminates capital costs, increases efficiency, and allows companies to focus on their core business while maintaining control over internal communications.
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Flexibele Organisatie | Masterclass Cloud ICT Flexibiliseer uw ICT en innoveer uw business
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What about privacy?
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129966863931865940[1]
1. On the Use of Weighted Filter Bank Analysis for
the Derivation of Robust MFCCs
Wei-Wen Hung
(Member, IEEE)
Department of Electrical Engineering
Ming Chi Institute of Technology
84 Gungjuan Road, Taishan, Taipei, Taiwan, 24306, Republic of China
E-mail :wwhung@ccsun.mit.edu.tw
FAX : 886-02-2906-1780; Tel. : 886-02-2906-0379
and
Hsiao-Chuan Wang
(Senior Member, IEEE)
(Associate Editor of IEEE Transactions on Speech and Audio Processing)
Department of Electrical Engineering
National Tsing Hua University
Hsinchu, 30043, Taiwan, Republic of China
E-mail : hcwang@ee.nthu.edu.tw
FAX : 886-03-571-5971; Tel. : 886-03-574-2587
EDICS number : SPL.SA.1.6 Speech Recognition
Re : SPL-2145
Corresponding Author : Wei-Wen Hung
2. On the Use of Weighted Filter Bank Analysis for
the Derivation of Robust MFCCs
∗
Wei-Wen Hung and #
Hsiao-Chuan Wang
∗
Department of Electrical Engineering, Ming Chi Institute of Technology
(Member, IEEE)
#
Department of Electrical Engineering, National Tsing Hua University
(Senior Member, IEEE)
(Associate Editor of IEEE Transactions on Speech and Audio Processing)
Abstract – In this paper, we discuss the use of weighted filter bank analysis (WFBA) to increase the
discriminating ability of mel frequency cepstral coefficients (MFCCs). The WFBA emphasizes the peak
structure of the log filter bank energies (LFBEs) obtained from filter bank analysis while attenuating the
components with lower energy in a simple, direct and effective way. Experimental results for recognition
of continuous Mandarin telephone speech indicate that the WFBA-based cepstral features are more
robust than those derived by employing the standard filter bank analysis and some widely used cepstral
liftering and frequency filtering schemes both in channel-distorted and noisy conditions.
Indexing Terms – Weighted filter bank analysis (WFBA), log filter bank energy (LFBE), mel frequency
cepstral coefficient (MFCC).
This research has been partially sponsored by the National Science Council, Taiwan, ROC, under
contract number NSC-89-2614-E-007-002.
3. LIST OF FIGURES AND TABLES
Fig. 1. Block diagram for the derivation of MFCCs based on the weighted filter bank analysis.
Fig. 2. F-ratio curves of mel frequency cepstral coefficients based on various schemes.
(A) For the 12-order cepstral coefficients.
(B) For the 12-order delta cepstral coefficients.
Fig. 3. Relationships between fuzzy factors and syllable recognition rates under different conditions.
Table I. COMPARISONS OF SYLLABLE RECOGNITION RATES FOR VARIOUS SCHEMES
UNDER DIFFERENT CONDITIONS.
4. I. INTRODUCTION
The filter bank analysis (FBA) is one of the most extensively employed spectral analysis techniques,
which is required among various kinds of speech applications. This approach typically uses a bank of
highly overlapped band-pass filters that roughly approximates the frequency response of basilar
membrane in the cochlea to cover the frequency range of interest in a speech signal. The measurement
from the outputs of those band-pass filters can be essentially treated as a short-time spectral envelope.
This measured spectral envelope is easily prone to statistical variation due to speaker characteristics,
background noise, channel effect and limitations of the underlying speech analysis model, etc., and it may
make spectral comparisons unreliable. To suppress those undesired variations and to obtain a more
reliable distance measure, a cepstral liftering (CL) scheme [1] has been developed to account for the
sensitivity of cepstral coefficients. In this regard the applied weights )(mL used in the liftering process
take advantage of the statistical characteristic of cepstral coefficients and the resulting liftered distance
measure is given by
[ ] [ ] ,~)()(~)
~
,(
1
2
1
2
)()()()( ∑∑
==
⋅−⋅=−=
L
m
mm
L
m
CLmCLmCLCL cmLcmLccCCd (1)
where [ ])()()()( ,,, CLLCL2CL1CL cccC ⋅⋅⋅= and [ ])()()()(
~,,~,~~
CLLCL2CL1CL cccC ⋅⋅⋅= are two liftered cepstral
vectors. Various types of weighting functions including linear, sinusoidal, exponential, band-pass and
ramp lifters have been introduced in the literature.
Besides the cepstral liftering scheme, Battle et al. [2] proposed an alternative to improve the
robustness of FBA-based speech features by filtering the frequency sequence of log filter bank energies
(LFBEs). The frequency filtering (FF) scheme not only approximately equalizes the variances of cepstral
coefficients up to a certain quefrency index, but also decorrelates the log filter bank energies to some
5. extents. This filtering process can be accomplished by passing the sequence of log filter bank energies
through a finite impulse response (FIR) filter of the form
∑ −
⋅=
i
i
i zhzH )( (2)
Although the aforementioned cepstral liftering and frequency filtering schemes have been widely used in
enhancing the robustness of cepstral features, there is still a need to investigate new approaches for
achieving better performance. Subsequently, we shall introduce a new weighted filter bank analysis
(WFBA) scheme which results in a set of discriminating cepstral features in a simple, direct and effective
way while maintaining a relatively low computation cost.
II. WEIGHTED FILTER BANK ANALYSIS SCHEME
Assuming that )(nx represents the frame of a speech signal that is pre-emphasized and
Hamming-windowed, then the derivation of conventional mel frequency cepstral coefficients (MFCCs)
proceeds as follows. Firstly, the speech frame )(nx , where Nn1 ≤≤ , is transformed from time
domain into frequency domain by applying an −N point short-time Fourier transform (STFT), and the
resulting power spectrum
2
kX )( can be formulated as
,)
2
exp()()(
2
1
2
∑
=
⋅⋅⋅
⋅−⋅=
N
n N
kn
jnxkX
π
(3)
where Nk ≤≤1 . Once the power spectrum
2
)(kX is obtained, we can calculate the filter bank
energy )(ie passing through the thi − mel-scaled critical band-pass filter )(kiψ by
,)()()(
1
2
∑
=
⋅=
N
k
i kkXie ψ (4)
6. where Qi1 ≤≤ and Q is the number of mel-scaled triangular band-pass filters. Finally, a discrete
cosine transform (DCT) is applied to the frequency sequence of log filter bank energies
{ }Qi1ie ≤≤)],(log[ . Thus, the mel frequency cepstral coefficients mc can be expressed as
,)(cos)](log[∑=
⋅
−⋅
⋅⋅=
Q
1i
m
Q2
1i2
miec
π
(5)
where ,Lm1 ≤≤ and L is the desired number of cepstral features.
From above description, we can find that a distorted speech signal always causes considerable
spectral variations and results in performance degradation. However, it is also known that more noise can
be perceptually tolerated in the spectral formant regions than in the spectral valleys. Therefore, our goal is
to emphasize the high energy parts of the log filter bank energies such that the cepstral features become
less susceptible to environmental interference. In our approach shown in Fig. 1, the log filter bank
energies are multiplied by a set of weighting factors prior to performing discrete cosine transform, that is
[3]
.)
2
12
(cos)](log[)(
1
)( ∑
=
⋅
−⋅
⋅⋅⋅=
Q
i
WFBAm
Q
i
mieiwc
π
(6)
In this study, we investigate the effects of the following two types of weighting functions.
Type 1. ∑
=
=
Q
j
jiiw
1
)( ββ and ∑
=
−
+
+
=
Q
1r
1F
1
i
01re
01ie
].)(log[
].)(log[
β . (7)
Type 2. .].)(log[].)(log[)( ∑
=
++=
Q
1j
01je01ieiw (8)
For the first type of weighting function, a fuzzy membership function is used to determine the weights. By
properly adjusting the fuzzy factor F , we can achieve various extents of fuzziness for the WFBA
7. scheme. When the fuzzy factor F tends to 1.0 and )(ie is the maximum energy, then the weights are
distributed with )(iw =1.0 and )( jw =0.0 for ji ≠ . On the other hand, in the case of ∞→F , all the
weights become equal and are set to Q1 . In the second type, the weighting terms are directly
proportional to the log energy of each critical band. In addition, it does not require a priori determination
of the fuzzy factor and therefore needs less computation. We will refer to the cepstral features calculated
by WFBA scheme using Type 1 and 2 weighting functions as the “FWFBA” and “DWFBA”,
respectively.
III. EXPERIMENTS AND DISCUSSIONS
The MAT (Mandarin Across Taiwan) speech database [3] was used to evaluate the presented
schemes. The database provided by the Computational Linguistic Society of R.O.C. was collected over
the public telephone network and each Mandarin word comprised 1~23 Mandarin syllables. From the
MAT database, we chose 8320 phonetically balanced Mandarin words (37784 syllables) spoken by 81
males and 79 females to train the right-context-dependent sub-syllable HMMs of 410 Mandarin syllables.
Moreover, each syllable model contains six to seven states in which the output observation distribution is
characterized by a 4-mixture Gaussian density function with diagonal covariance matrix. In the testing
phase, the evaluated schemes were applied to a 500-utterance (4754 syllables) recognition task in which
the testing utterances spoken by 15 males and 15 females were selected from a different set of the MAT
database. The feature vector was composed of 12-order mel frequency cepstral coefficients and their
first-order time derivatives. To simulate various noisy conditions, the 500 testing utterances were
corrupted by the additive white Gaussian noise (AWGN) with signal-to-noise ratio (SNR) at 10 dB, 20
dB and 30 dB. In addition, a sinusoidal lifter [1] and an FIR filter of the form 1
zzzH −
−=)( [2] were
8. used in the experiments for comparative purpose and abbreviated as SL and FF, respectively.
To evaluate the discriminating abilities of the speech features employing various schemes, we treated
each state from all the syllable models as a separate speech class and used F-ratio measure [4] to test the
class separability in the feature space. The F-ratio measure takes into account the variance of means and
the mean of variances among classes. It has been confirmed that good class separability with large F-ratio
measure gives high recognition accuracy. In Fig. 2, it shows the F-ratio curves of the 12-order mel
frequency cepstral coefficients and their first-order time derivatives derived by applying various schemes.
From these curves, we can find that lower quefrency coefficients generally have higher F-ratios and
should therefore offer better class separation. In addition, it can be seen that the WFBA scheme
compared to the other schemes always achieves higher F-ratios for different cepstral coefficients.
Especially, the FWFBA is superior to the DWFBA at the price of requiring more computation cost.
In the aspect of recognition for continuous Mandarin telephone speech, we evaluated these schemes in
terms of syllable recognition rate (S.R.R). Two kinds of environmental conditions including channel
distortion and noise corruption were investigated, and to see if the WFBA scheme can achieve better
syllable recognition rates than the other evaluated schemes in channel-distorted and noisy conditions. In
the channel-compensated condition, the widely used cepstral mean subtraction (CMS) [5] was employed
for canceling the embedded channel effect. In Fig. 3, we illustrated the relationships between the fuzzy
factors and the syllable recognition rates under different conditions. It shows that the syllable recognition
rate initially increases with the fuzzy factor F , attains a maximum value and then decreases with an
increase in the fuzzy factor. Obviously, the optimal value of fuzzy factor is related to SNR value, i.e.,
the smaller the SNR value of additive white Gaussian noise, the smaller the optimal value of fuzzy factor.
Moreover, we also find that further improvement in syllable recognition rate can be obtained by
9. integrating the WFBA with the CMS. On the other hand, as shown in Table I, we can also observe that
the WFBA technique outperforms the SL and FF schemes and exhibits consistent improvements for the
channel-distorted, channel-compensated and various noisy conditions. As far as computation cost is
concerned, the computation complexity required by the DWFBA is lower than for the FWFBA. Finally,
it is worth to note that the optimal value of fuzzy factor should be heavily related to SNR value and is still
not easily derived. In this study, the optimal values of fuzzy factor under various conditions were
determined in a time-consuming manner by selecting some specific values and their neighbors and
comparing the corresponding syllable recognition rates.
IV. CONCLUSIONS
In this paper, a weighted filter bank analysis scheme with emphasis on the peak structure of log filter
bank energies is proposed for the derivation of robust cepstral features. Two kinds of weighting functions
employed in the WFBA are investigated. The experiments show that by properly adjusting the fuzzy
factor the FWFBA has higher capability in enhancing the discriminating ability of cepstral features than the
conventional FBA scheme and the other two widely used schemes, i.e., cepstral liftering and frequency
filtering schemes. Also, instead of the FWFBA, the DWFBA can offer a simpler form for weighting the
LFBEs with much less computation cost while maintaining comparable recognition accuracy. In addition,
it is shown that the WFBA is effective for noisy speech recognition and can be well combined with some
environment-compensated techniques, such as the CMS, to achieve higher recognition rates if necessary.
10. REFERENCES
[1] B. H. Juang, L. R. Rabiner, and J. G. Wilpon, “On the use of band-pass liftering in speech recognition,”
IEEE Trans. Acoust., Speech, Signal Processing, vol. 35, no. 7, pp. 947-954, July, 1987.
[2] E. Battle, C. Nadeu and J. A. R. Fonollosa, “Feature decorrelation methods in speech recognition :A
comparative study,” Proceedings of International Conference on Spoken Language Processing, pp.
951-954, 1998.
[3] W. W. Hung, and H. C. Wang, “A fuzzy approach for equalization of the cepstral variances,”
Proceeding of International Conference on Acoustics, Speech, and Signal Processing, vol. 3,
SP-P7, pp.1611-1614, Istanbul, June 2000.
[4] S. Nicholson, B. Milner and S. Cox, “Evaluating feature set performance using the F-ratio and
J-measures,” Proceeding of European Conference on Speech Communication and Technology,
vol. 1, pp.413-416, Greece, September 1997.
[5] S. Furui, “Cepstral analysis technique for automatic speaker verification,” IEEE Trans. Acoustics,
Speech and Signal Processing, vol. ASSP-29, pp. 254-272, 1981.
11. Figures and tables captions :
Fig. 1. Block diagram for the derivation of MFCCs based on the weighted filter bank analysis.
Fig. 2. F-ratio curves of mel frequency cepstral coefficients based on various schemes.
(A) For the 12-order cepstral coefficients.
(B) For the 12-order delta cepstral coefficients.
Fig. 3. Relationships between fuzzy factors and syllable recognition rates under different conditions.
Table I. COMPARISONS OF SYLLABLE RECOGNITION RATES FOR VARIOUS SCHEMES
UNDER DIFFERENT CONDITIONS.
Fig. 1
)(k1ψ )1(w
2
)(kX ⊗ )1(e ])(log[ .011e + ⊗
)(nx )(kQψ )(Qw
)(WFBAmC
2
)(kX ⊗ )(Qe ])(log[ .01Qe + ⊗
|STFT|
×
|STFT|
1.1.DCT
Pre-emphasis&
HammingWindowing
1.2.
1.3.