Prof. William J. Williams Profile

Prof. William J. Williams

Professor Emeritus at Univ of Michigan

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 25 August 2006 Paper

Application of time-frequency analysis methods to speaker verification

W. Williams, R. Bossemeyer

Proceedings Volume 6313, 63130P (2006) https://doi.org/10.1117/12.681019

KEYWORDS: Speaker recognition, Time-frequency analysis, Analytical research, Signal processing, Mouth, Biometrics, Databases, Tongue, Algorithm development, Lung

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Proceedings Article | 24 December 2003 Open Access

Scale and translation invariant shape and signal classification and detection

William Williams

Proceedings Volume 5205, (2003) https://doi.org/10.1117/12.513902

KEYWORDS: Signal detection, Time-frequency analysis, Fourier transforms, Radar, Image processing, Oceanography, Backscatter, Image classification, Doppler effect, Ocean optics

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Proceedings Article | 6 December 2002 Paper

Time-frequency-guided quadratic filters

William Williams

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.455785

KEYWORDS: Electronic filtering, Time-frequency analysis, Interference (communication), Linear filtering, Signal detection, Fourier transforms, Filtering (signal processing), MATLAB, Quantum computing, Electrical engineering

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Proceedings Article | 20 November 2001 Paper

Time-frequency analysis of laser weld signature

Allen Sun, Elijah Kannatey-Asibu, William Williams, Mark Gartner

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448639

KEYWORDS: Time-frequency analysis, Ultraviolet radiation, Sensors, Infrared sensors, Infrared radiation, Acoustic emission, Signal processing, Laser welding, Gas lasers, Signal analyzers

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Proceedings Article | 20 November 2001 Paper

Minimum entropy approach to denoising time-frequency distributions

Selin Aviyente, William Williams

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448690

KEYWORDS: Time-frequency analysis, Denoising, Interference (communication), Signal to noise ratio, Wavelets, Smoothing, Probability theory, Image information entropy, Fourier transforms, Visualization

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Proceedings Article | 20 November 2001 Paper

Renyi information for extracting features from TFDs

William Williams

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448691

KEYWORDS: Time-frequency analysis, Fourier transforms, Video, Signal detection, Epilepsy, Information fusion, Tissues, Electrical engineering, Computer science, Signal processing

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Proceedings Article | 13 November 2000 Paper

Optimal warping function design for discrete time-warped Fourier transforms

Robert Nickel, William Williams

Proceedings Volume 4116, (2000) https://doi.org/10.1117/12.406529

KEYWORDS: Fourier transforms, Transform theory, Signal processing, Probability theory, Numerical analysis, Solids, Signal generators, System identification, Optimization (mathematics), Information theory

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Proceedings Article | 13 November 2000 Paper

Discrete scale vectors and decomposition of time-frequency kernels

Selin Aviyente, William Williams

Proceedings Volume 4116, (2000) https://doi.org/10.1117/12.406487

KEYWORDS: Time-frequency analysis, Wavelets, Fourier transforms, Electrical engineering, Computer science, Signal analyzers, Signal processing, Space operations, Matrices, Lead

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Proceedings Article | 13 November 2000 Paper

Application of time-frequency analysis to high-power microwave devices

Christopher Peters, William Williams, Ronald Gilgenbach, Yue Lau, Reginald Jaynes, William Cohen, Michael Lopez, Thomas Spencer

Proceedings Volume 4116, (2000) https://doi.org/10.1117/12.406494

KEYWORDS: Microwave radiation, Time-frequency analysis, High power microwaves, Fourier transforms, Electron beams, Frequency modulation, Magnetism, Waveguides, Dispersion, Pulsed power

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Proceedings Article | 14 July 2000 Paper

Experiments on slotted coaxial high-power gyrotrons

Ronald Gilgenbach, Reginald Jaynes, William Cohen, Christopher Peters, Michael Lopez, Yue Lau, William Williams, T. Spencer

Proceedings Volume 4031, (2000) https://doi.org/10.1117/12.391801

KEYWORDS: Microwave radiation, Medium wave, Magnetism, Electron beams, Diodes, High power microwaves, Plasma, S band, Diagnostics, Oscillators

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Proceedings Article | 2 November 1999 Paper

Generalized scale transforms

Robert Nickel, William Williams

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367663

KEYWORDS: Transform theory, Time-frequency analysis, Fourier transforms, Electronic filtering, Signal processing, Convolution, Information technology, Nickel, Electrical engineering, Computer science

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Proceedings Article | 2 November 1999 Paper

Minimal-window time-frequency distributions

William Williams, Selin Aviyente

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367661

KEYWORDS: Time-frequency analysis, Matrices, Wavelets, Fourier transforms, Smoothing, Algorithms, Electrical engineering, Computer science, Signal processing, Radon

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Proceedings Article | 2 November 1999 Paper

Discrete implementations of scale transform

Dragan Djurdjanovic, William Williams, Christopher Koh

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367668

KEYWORDS: Discretization errors, Signal processing, Error analysis, Image restoration, Solids, Signal analyzers, Image filtering, Fourier transforms, Algorithm development, Biological research

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Proceedings Article | 2 October 1998 Paper

Cross Hilbert time-frequency distributions

William Williams

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325673

KEYWORDS: Time-frequency analysis, Signal analyzers, Signal processing, Fourier transforms, Electrical engineering, Computer science, Surface plasmons, Mathematics, Algorithms, Convolution

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Proceedings Article | 2 October 1998 Paper

New signal adaptive approach for the reduction of interference terms in quadratic time-frequency distributions

Robert Nickel, William Williams

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325674

KEYWORDS: Time-frequency analysis, Frequency modulation, Linear filtering, Signal processing, Correlation function, Interference (communication), Nickel, Spectral resolution, Smoothing, Electrical engineering

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Proceedings Article | 24 October 1997 Paper

Pattern recognition under translation and scale changes

Eugene Zalubas, William Williams

Proceedings Volume 3162, (1997) https://doi.org/10.1117/12.284181

KEYWORDS: Pattern recognition, Raster graphics, Time-frequency analysis, Image classification, Solids, Signal detection, Interference (communication), Image segmentation, Feature extraction, Signal processing

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Proceedings Article | 24 October 1997 Paper

Wavelet windowed time-frequency distribution decompositions

William Williams, Tzuhsien Sang, Jeffrey O Neill, Eugene Zalubas

Proceedings Volume 3162, (1997) https://doi.org/10.1117/12.284184

KEYWORDS: Wavelets, Time-frequency analysis, Radar, Fourier transforms, Matrices, Wavelet transforms, Backscatter, Algorithms, Signal analyzers, Doppler effect

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Proceedings Article | 22 October 1996 Paper

Kalman filtering and time-frequency distribution of random signals

P. Madhavan, William Williams

Proceedings Volume 2846, (1996) https://doi.org/10.1117/12.255430

KEYWORDS: Signal to noise ratio, Time-frequency analysis, Filtering (signal processing), Interference (communication), Electronic filtering, Stochastic processes, Smoothing, Error analysis, Temporal resolution, Detection theory

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Proceedings Article | 22 October 1996 Paper

Statistics for Cohen's class distribution of white Gaussian noise

Christopher McCormack, Valdis Liepa, William Williams

Proceedings Volume 2846, (1996) https://doi.org/10.1117/12.255441

KEYWORDS: Time-frequency analysis, Interference (communication), Signal processing, Fourier transforms, Statistical analysis, Signal analysis, Computer simulations, Convolution, Radon, Electrical engineering

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Proceedings Article | 22 October 1996 Paper

Separating desired image and signal invariant components from extraneous variations

William Williams, Eugene Zalubas, Alfred Hero

Proceedings Volume 2846, (1996) https://doi.org/10.1117/12.255439

KEYWORDS: Raster graphics, Optical character recognition, Matrices, Time-frequency analysis, Image segmentation, Image processing, Pattern recognition, Signal processing, Image classification, Contamination

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Proceedings Article | 7 June 1995 Paper

Decomposition of time-frequency distributions using scaled-window spectrograms

William Williams, Jeffrey O Neill

Proceedings Volume 2563, (1995) https://doi.org/10.1117/12.211424

KEYWORDS: Time-frequency analysis, Wavelets, Fourier transforms, Matrices, Yield improvement, Electrical engineering, Computer science, Algorithm development, Visualization, Mathematics

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Proceedings Article | 7 June 1995 Paper

Time-frequency analysis of radar target backscatter

Christopher McCormack, Valdis Liepa, William Williams

Proceedings Volume 2563, (1995) https://doi.org/10.1117/12.211391

KEYWORDS: Optical spheres, Time-frequency analysis, Doppler effect, Radar, Error analysis, Backscatter, Signal analyzers, Electromagnetic scattering, Scattering, Electromagnetism

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Proceedings Article | 30 November 1992 Paper

High-spectral-resolution time-frequency distribution kernels

Moeness Amin, William Williams

Proceedings Volume 1770, (1992) https://doi.org/10.1117/12.130938

KEYWORDS: Spectral resolution, Time-frequency analysis, Amplitude modulation, Autoregressive models, Linear filtering, Statistical analysis, Electrical engineering, Fourier transforms, Electronic filtering, Matrices

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Proceedings Article | 30 November 1992 Paper

Decomposition of time-frequency distribution kernels

Gregory Cunningham, William Williams

Proceedings Volume 1770, (1992) https://doi.org/10.1117/12.130942

KEYWORDS: Surface plasmons, Time-frequency analysis, Signal analyzers, Fourier transforms, Optical correlators, Spectral resolution, Signal processing, Analytical research, Electrical engineering, Computer science

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Proceedings Article | 1 December 1991 Paper

Uncertainty, information, and time-frequency distributions

William Williams, Mark Brown, Alfred Hero

Proceedings Volume 1566, (1991) https://doi.org/10.1117/12.49818

KEYWORDS: Time-frequency analysis, Signal processing, Quantum mechanics, Signal detection, Signal analysis, Fourier transforms, Particles, Wavelet transforms, Electrical engineering, Computer science

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