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[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

4-6 Oct. 1992

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Displaying Results 1 - 25 of 134
  • Proceedings of the IEEE-SP International Symposium Time-Frequency and Time-Scale Analysis (Cat.No.92TH0478-8)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (107 KB)
    Freely Available from IEEE
  • Measuring amplitude and frequency modulations in noise using multiband energy operators

    Publication Year: 1992, Page(s):3 - 6
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The statistical properties of the nonlinear energy operator Ψ( s)=(ds/dt)2-sd2 /dt2 and a related energy separation algorithm (ESA) are developed. The ESA uses Ψ to demodulate noisy AM-FM signals. The performance of Ψ and the ESA when applied to bandpass noisy AM-FM signals is examined. The predicted performa... View full abstract»

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  • Noise reduction with a multiscale edge representation and perceptual criteria

    Publication Year: 1992, Page(s):555 - 558
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The wavelet multiscale edge representation of signals developed by S.G. Mallat and S. Zhong (1991) provides a new tool for signal and image processing. A tree structure was built from wavelet-transform (WT) maxima, and metrics for analyzing the WT maxima tree were developed. These metrics fall into two classes corresponding to two perceptual criteria (scaling and spatial stabilities) for discrimin... View full abstract»

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  • Adaptive time-frequency decomposition with matching pursuits

    Publication Year: 1992, Page(s):7 - 10
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    An adaptive time-frequency decomposition is introduced. It represents signals as a linear expansion of local time-frequency waveforms, selected in order to match the signal structures. The decomposition is performed with an algorithm, called matching pursuit, whose convergence is guaranteed. A new definition of signal energy density in the time-frequency plane is derived by summing the Wigner dist... View full abstract»

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  • An analysis/synthesis model for the human visual system based on subspace decomposition and multirate filter bank theory

    Publication Year: 1992, Page(s):559 - 562
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A two-stage model of the human visual system (HVS) comprised of low-level (analysis) and a high-level (synthesis) processing stages is presented. The processing done at the low-level stage is described using two approaches, one based on a subspace decomposition and the other on a multirate filter bank. These two models simultaneously provide the high-level processing stage with different perspecti... View full abstract»

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  • Time-frequency and time-scale analysis for musical transcription

    Publication Year: 1992, Page(s):421 - 424
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A representation in Cohen's class which improves on existing methods for a large class of musical signals is developed. The pseudo-Wigner distribution is extended to a constant-Q form well suited to the frequency resolution required for musical signal and pitch analysis. It has excellent resolution, but fails to provide even limited superposition. A kernel is designed for Cohen's class, b... View full abstract»

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  • Time-varying channel equalization using multiresolution analysis

    Publication Year: 1992, Page(s):447 - 450
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The equalization problem for rapidly varying channels is addressed, using multiresolution analysis tools. The time variations of the channel are modeled directly by expanding each time-varying (TV) tap coefficient onto a P-band wavelet basis. Only the low-resolution signal is then retained as a natural approximation of the channel's trajectory. The choice of the wavelet basis so that the ... View full abstract»

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  • Advantages of cascaded quadratic detectors for analysis of manufacturing sensor data

    Publication Year: 1992, Page(s):345 - 348
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Cascaded quadratic detectors are applied to manufacturing sensor signals. These detectors provide a technique which allows excellent frequency selectivity and noise suppression, without sacrificing temporal resolution. The authors demonstrate the applicability of these detectors with an example of manufacturing sensor data and show their advantages over conventional linear techniques View full abstract»

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  • The design of signal dependent time-frequency kernels by McClellan transformation

    Publication Year: 1992, Page(s):91 - 94
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A McClellan transformation 2-D filter design method is used for designing a signal dependent time-frequency (t-f) kernel. This method is amenable to t-f kernel constraints, which do not commonly arise when filtering signals in image and array processing applications. The two parts of the McClellan transformation method (the one-dimensional filter and the linear transformation) provide a mechanism ... View full abstract»

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  • Arbitrary orthogonal tilings of the time-frequency plane

    Publication Year: 1992, Page(s):11 - 14
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Expansions which give arbitrarily orthonormal tilings of the time-frequency plane are considered. These differ from the short-time Fourier transform, wavelet transform, and wavelet packets tilings in that they change over time. It is shown how orthonormal tilings can be achieved using time-varying orthogonal tree structures, which preserve orthogonality, even across transitions. One method is base... View full abstract»

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  • Fejer filtering for multiscale signal decomposition

    Publication Year: 1992, Page(s):563 - 566
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Multiscale signal decomposition is required in computational vision for the analysis of the information content of an image. The authors use the Fejer filtering multispectral signal decomposition technique, which uses the Fejer kernel in the classical Fourier analysis. It is built on a diffraction imaging model from the perspective of Fourier optics based on the uncertainty principle and the argum... View full abstract»

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  • Time-frequency analysis with temporal and spectral resolution as the human auditory system

    Publication Year: 1992, Page(s):425 - 428
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The human perception of sound is a suitable area for the application of a simultaneous time-frequency analysis, since the ear is selective in both domains. A perfect reconstruction filter bank with bandwidths approximating the critical bands is presented. The orthogonality of the filter makes it possible to examine the masking effect with realistic signals. The tree structure of the filter bank ma... View full abstract»

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  • Butterworth wavelets and adaptive echo cancellation

    Publication Year: 1992, Page(s):451 - 454
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Butterworth wavelets are introduced for wavelet analysis, and it is shown that they constitute a large class of orthonormal wavelets with some advantages. Wavelet and binary tree representations are compared, and cross terms that decrease the intelligibility are suppressed by carefully adjusting the cut-off frequency. Rational sampling is used to obtain nonaliased frequency bands. Structural freed... View full abstract»

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  • Application of `matched' wavelets to identification of metallic transients

    Publication Year: 1992, Page(s):349 - 352
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A class of signals that usually precede failure of machinery are metallic transients due to momentary contact of supposedly noncontacting moving parts. In many cases these transients can be modeled as sums of spectral components. It is possible to construct models of metallic transients by summing together shifted and dilated copies of a single damped sinusoid. Wavelets are inherently suited to th... View full abstract»

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  • Wavelets as a regularization technique for spectral density estimation

    Publication Year: 1992, Page(s):73 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Estimation of the spectral density S(f) of a stationary random process can be viewed as a nonparametric statistical estimation problem. A nonparametric approach based on a wavelet representation for the logarithm of the unknown S(f) is introduced. This approach offers the ability to capture significant components of S(f) at different resolution... View full abstract»

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  • A complete parametrization of 2D nonseparable orthonormal wavelets

    Publication Year: 1992, Page(s):55 - 58
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The problem of constructing compactly supported orthonormal multidimensional (k-D) nonseparable wavelets is considered. A complete solution to the problem of parametrizing all possible two-dimensional (2-D) wavelets having arbitrary degree of regularity is given. These results can be seen as a generalization of the Daubechies (1988) wavelets in two dimensions and go beyond those specific ... View full abstract»

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  • Applications of time-frequency and time-scale representations to fault detection and classification

    Publication Year: 1992, Page(s):95 - 98
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors propose the use of generalized time-frequency and time-scale representations coupled with a hierarchy of neural nets to solve the problem of the automatic detection and classification of faults in mechanical systems such as the gearboxes and transmissions onboard helicopters. With this technique, no underlying model for the events of interest is assumed. Rather the system learns to det... View full abstract»

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  • Time-frequency fine structure of dolphin whistles

    Publication Year: 1992, Page(s):17 - 20
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Data indicating that whistles of bottlenosed dolphins Tursiops truncatus are not simple tonal signals are presented. Whistles are not simply sinsoidal signals with rather slowly varying frequency contours, but also include more complex attributes, which may be related to a short-duration phenomenon, perhaps akin to a rapid frequency modulation of the basic tonal components. These subtle fluctuatio... View full abstract»

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  • Registration and matching using orthogonal wavelets

    Publication Year: 1992, Page(s):567 - 570
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Algorithms for applying the orthogonal wavelet pyramid representation in matching and registration for pattern recognition are presented. They compensate for lack of translation invariance by beginning from feasible points at a coarse level and by tracking registrations through ever finer resolution levels, and they quickly compare coarse representations of candidates for matching against library ... View full abstract»

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  • Sound event detection using cochlea information

    Publication Year: 1992, Page(s):429 - 432
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A technique for detection of sound events based on the attention and gestalt perception, two basic principles that are widely used by man for detection and recognition of sound events, is discussed. In particular, an array of cochlear perceptors (ACP) is proposed as a tool for analysis of a sound scene and as a suitable basis for implementation of both principles. An input signal is described by a... View full abstract»

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  • Scale based coding of digital communication signals

    Publication Year: 1992, Page(s):455 - 458
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Multiple-access communication schemes using wavelet-based orthogonal codes are described. In the simplest such scheme, the message bit stream in each channel is encoded as a sequence of time-shifted replicates of a mother wavelet symbol at a particular scale. Different channels use the same wavelet symbol but a different scale. The messages are decodable if the time-shifted and dilated replicates ... View full abstract»

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  • Knocking recognition in engine vibration signal using the wavelet transform

    Publication Year: 1992, Page(s):353 - 356
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The authors propose pattern recognition using wavelet parameters for detecting a physical signal, i.e., knocking, in engine vibration. It is shown that wavelet transform parameters of the vibration signal improve knocking detection, especially at high speed, for slow signal-to-noise ratio (SNR). The knocking signal is characterized by the sum of several resonance frequencies. This method should gi... View full abstract»

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  • Time-frequency and time-scale analysis of high resolution ECGs

    Publication Year: 1992, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Electrocardiograms (ECGs) of patients prone to ventricular tachycardia present micropotentials which may be defined as low amplitude, high frequency signals. The use of the Wigner distribution (WD) and wavelet transform (WT) to detect such micropotentials in high resolution ECGs is investigated. The two methods are precisely compared on data from patients with and without ventricular tachycardia. ... View full abstract»

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  • The parametric wavelet maxima representation

    Publication Year: 1992, Page(s):59 - 62
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A general signal description, called an inherently bounded adaptive quasi linear representation (AQLR), motivated by the wavelet maxima representation and the wavelet zero-crossings representation, is introduced. A reconstruction scheme based on the minimization of an appropriate cost function is presented. The convergence of two algorithms described herein is guaranteed for all inherently bounded... View full abstract»

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  • A general solution of biorthogonal analysis window functions for orthogonal-like discrete Gabor transform

    Publication Year: 1992, Page(s):387 - 389
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    An algorithm for computing the analysis window function γ( i) for the discrete Gabor transform (DGT) corresponding to an arbitrary synthesis window function h(i) and sampling pattern is presented. Numerical simulations indicate that the algorithm successfully addresses problems that could not be solved previously due to rank deficiency or numerical instability View full abstract»

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