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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 6 • Date Jun 1990

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Displaying Results 1 - 21 of 21
  • Stochastic and deterministic networks for texture segmentation

    Publication Year: 1990, Page(s):1039 - 1049
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1352 KB)

    Several texture segmentation algorithms based on deterministic and stochastic relaxation principles, and their implementation on parallel networks, are described. The segmentation process is posed as an optimization problem and two different optimality criteria are considered. The first criterion involves maximizing the posterior distribution of the intensity field given the label field (maximum a... View full abstract»

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  • On the sensitivity of direct form and nested structures of FIR filters

    Publication Year: 1990, Page(s):1052 - 1053
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The sensitivity analysis of nested structures of FIR filters is extended to show that direct-form structures have sensitivities identical to those of the nested structures. The key to having identical coefficient sensitivity is to use the same scale representation for the coefficients View full abstract»

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  • Objective and subjective optimization of APC system performance

    Publication Year: 1990, Page(s):1053 - 1058
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    System configurations and relative performance results are presented for adaptive predictive coding (APC) systems at 9.6 kb/s based on three different criteria: subjective listening tests; signal-to-quantization noise ratio (SNR); and segmental SNR (SNRseg). The subjectively optimized coder has little granular noise but some spectral distortion and SNR and SNRseg values less than half those of the... View full abstract»

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  • Minimum mean absolute error stack filtering with structural constraint and goals

    Publication Year: 1990, Page(s):955 - 968
    Cited by:  Papers (45)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1208 KB)

    A theory for the structural behavior of stack filters is developed. This theory provides a test which can determine if a given stack filter has any root signals; a method for classifying the root signal behavior of any stack filter found to have roots; and, perhaps most important, a method for designing stack filters with specific root signals or other structural behavior. This theory of root sign... View full abstract»

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  • Power spectrum estimation with randomly spaced correlation samples

    Publication Year: 1990, Page(s):991 - 998
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    Three algorithms are developed to reproduce uniformly spaced correlation measurements for power spectrum estimation. Some general relations between the randomly spaced correlation samples and the power spectrum are derived. The details of the three algorithms that can be used to reproduce uniformly spaced correlation measurements are included. Simulation examples using sinusoidal signals are given... View full abstract»

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  • Lapped transforms for efficient transform/subband coding

    Publication Year: 1990, Page(s):969 - 978
    Cited by:  Papers (144)  |  Patents (82)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    Two lapped transforms for subband/transform coding of signals are introduced: a version of the lapped orthogonal transform (LOT), which can be efficiently computed for any transform length; and the modulated lapped transform (MLT), which is based on a modulated quadrature mirror (QMF) bank. The MLT can also be efficiently computed by means of a type-IV discrete sine transform (DST-IV). The LOT and... View full abstract»

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  • Recursive reconstruction of high resolution image from noisy undersampled multiframes

    Publication Year: 1990, Page(s):1013 - 1027
    Cited by:  Papers (148)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2096 KB)

    In several applications it is required to reconstruct a high-resolution noise-free image from multipath frames of undersampled low-resolution noisy images. Using the aliasing relationship between the undersamples frames and the reference image, an algorithm based on weighted recursive least-squares theory is developed in the wavenumber domain. This algorithm is efficient because interpolation and ... View full abstract»

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  • Design of IIR filters in the complex domain

    Publication Year: 1990, Page(s):910 - 920
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    The problem of IIR (infinite impulse response) digital filter design in the complex domain is formulated in a way such that the existence of the best approximation is guaranteed. An efficient algorithm based on the Ellacott-Williams method is proposed to solve the problem. The algorithm separately designs the numerator and denominator, and uses a linear programming method to solve the linear compl... View full abstract»

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  • A fast least-square deconvolution algorithm for vocal tract cross section estimation

    Publication Year: 1990, Page(s):921 - 924
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    An efficient computation algorithm, based on unitary Jacobi-type rotations, is developed for fast least-square deconvolution. Specifically, this algorithm is able to solve a positive definite covariance matrix with a special Toeplitz structure in O(N2) operations instead of O(N3) operations. This algorithm, which takes advantage of the inherent structure of ... View full abstract»

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  • A curiosum concerning discrete time convolution

    Publication Year: 1990, Page(s):1058 - 1059
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    It is shown that the discrete-time convolution of two absolutely summable nowhere-zero sequences may be identically equal to zero View full abstract»

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  • Autoregressive equivalents of rank order processors

    Publication Year: 1990, Page(s):1050 - 1052
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A theory is presented which shows that any rank order processor (ROP) specified as a positive regular set over the binary alphabet, and any ROP implementable via a stack encoding as input to identical finite-set sequential machines, is also implementable in finite autoregressive form with conventional input encoding, provided an internal state vector is properly defined. Any such ROP algorithm can... View full abstract»

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  • Parseval relationship of nonuniform samples of one- and two-dimensional signals

    Publication Year: 1990, Page(s):1061 - 1063
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    It is shown that the Parseval's relationship is extendable to a general set of nonuniform samples of a bandlimited signal. Further extensions to 2D signals are also considered View full abstract»

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  • Adaptive stack filtering under the mean absolute error criterion

    Publication Year: 1990, Page(s):938 - 954
    Cited by:  Papers (75)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1864 KB)

    An adaptive filter algorithm is developed for the class of stack filters, which is a class of nonlinear filters obeying a weak superposition property. The adaptation algorithm can be interpreted as a learning algorithm for a group of decision-making units, the decisions of which are subject to a set of constraints called the stacking constraints. Under a rather weak statistical assumption on the t... View full abstract»

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  • An application of a BIC-type method to harmonic analysis and a new criterion for order determination of an AR process

    Publication Year: 1990, Page(s):999 - 1004
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A classical problem in harmonic analysis is discussed that arises when the periods are divisors of the series length and the disturbance noise is white Gaussian. An approach is presented whereby the presence or absence of the harmonics is determined by a method of the Bayesian information criterion (BIC) type. The criterion is derived based on the theory of statistics of extremes. A Hopfield neura... View full abstract»

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  • FIR filters with sigma-delta modulation encoding

    Publication Year: 1990, Page(s):979 - 990
    Cited by:  Papers (65)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Two methods are presented for building FIR (finite impulse response) digital filters where either the impulse response or the input signal is encoded using sigma-delta modulation. For each method, both single-loop and two-stage sigma-delta modulation are used for encoding. These systems are operated at a sampling rate higher than the Nyquist rate of the signal, and their performance depends on the... View full abstract»

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  • Inverse invariant distributions

    Publication Year: 1990, Page(s):1059 - 1061
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The probability density function associated with a random variable Z is inverse-invariant if it is identical to the density function associated with the inverse of Z. An intuitive method of finding inverse-invariant density functions is presented, with examples and notes on where these distributions arise. Specific parameter estimation algorithms which produce estimates having in... View full abstract»

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  • Wide-band, proportional-bandwidth Wigner-Ville analysis

    Publication Year: 1990, Page(s):1005 - 1012
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The Wigner-Ville (W-V) distribution is a time-frequency representation that yields a highly accurate estimate of instantaneous frequency. It is related to the narrow-band ambiguity function by an internal transform, and it can be used in a variety of detection and estimation problems. A spectrogram constructed with constant bandwidth filters can be obtained by convolving two W-V distributions or b... View full abstract»

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  • Classification of invariant image representations using a neural network

    Publication Year: 1990, Page(s):1028 - 1038
    Cited by:  Papers (102)  |  Patents (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A neural network (NN) based approach for classification of images represented by translation-, scale-, and rotation-invariant features is presented. The utilized network is a multilayer perceptron (MLP) classifier with one hidden layer. Back-propagation learning is used for its training. Two types of features are used: moment invariants derived from geometrical moments of the image, and features b... View full abstract»

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  • Frequency domain Cramer-Rao bound for Gaussian processes

    Publication Year: 1990, Page(s):1063 - 1066
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    An expression is derived for the asymptotic frequency-domain Cramer-Rao bound (CRB) on the parameters of Gaussian processes with information in their means. The general result extends Whittle's (1953) formula which is applicable to Gaussian processes with information in their covariance matrices or spectra. It is useful in many fields such as system identification, radar, and sonar. Examples of it... View full abstract»

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  • Suboptimal detection of non-Gaussian signals by third-order spectral analysis

    Publication Year: 1990, Page(s):901 - 909
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The use of higher-order spectra (HOS) is proposed for improving detection performance in non-Gaussian signals. The method comprises two stages. First, the higher-order spectra of the received signal are estimated using conventional spectral estimation techniques; then, a (maximum) likelihood ratio test (LRT) is performed in the higher-order-spectra domain. It is shown that, under certain low signa... View full abstract»

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  • Theory of two-dimensional multirate filter banks

    Publication Year: 1990, Page(s):925 - 937
    Cited by:  Papers (78)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (980 KB)

    Results are presented on 2-D FIR (two-dimensional finite-impulse-response) filter banks for multirate applications. The theory is valid for all sampling lattices; conditions for alias-free and perfect signal reconstruction are derived. Synthesis structures for paraunitary and nonparaunitary polynomial matrices are derived, which yield perfect reconstruction filter banks. The degrees of freedom are... View full abstract»

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Aims & Scope

This Transactions ceased production in 1990. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope