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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 3 • Date March 1987

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Displaying Results 1 - 21 of 21
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Supplement to "On two-dimensional polyphase filter banks"

    Publication Year: 1987, Page(s):403 - 404
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (173 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1987, Page(s): c4
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    Freely Available from IEEE
  • A hybrid Hadamard LPC scheme for picture coding

    Publication Year: 1987, Page(s):391 - 394
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A transform-LPC hybrid system for real-time coding of picture data has been presented. The LPC has been made adaptive by using a correlation cancellation loop. Three different schemes for coding and reconstructing the transform components have been presented and their relative performances have been compared. The MSE and SNR are seen to be comparable to previous work on transform-DPCM hybrid schem... View full abstract»

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  • Rank reduction for modeling stationary signals

    Publication Year: 1987, Page(s):350 - 355
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Rank reduction is developed as a general principle for trading off model bias and model variance in the analysis and synthesis of signals. The principle is applied to three basic problems: stationary time series modeling, stationary time series whitening, and vector quantization. Each problem brings its own surprises and insights. View full abstract»

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  • A new filter bank theory for time-frequency representation

    Publication Year: 1987, Page(s):314 - 327
    Cited by:  Papers (63)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    This paper presents a new formalism for the description of analysis/synthesis systems based on filter banks. Although this work was done in the context of speech coding systems, the results apply to a far broader class of problems. This new formalism has three specific advantages. First, it allows for the description of many different techniques and approaches with one unifying theory. Second, it ... View full abstract»

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  • A unified approach to nonparametric spectrum estimation algorithms

    Publication Year: 1987, Page(s):338 - 349
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB)

    Different approaches to spectrum estimation can be broadly classified as parametric and nonparametric methods. In the parametric techniques, an underlying model is assumed in the formulation of the spectrum estimation problem and one estimates the parameters of the model. For nonparametric methods, no such model is assumed. In this paper, several nonparametric spectrum estimation algorithms are br... View full abstract»

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  • Spatial/Spectral filtering with linearly constrained minimum variance beamformers

    Publication Year: 1987, Page(s):249 - 266
    Cited by:  Papers (156)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1832 KB)

    In this paper, orthogonal low-dimension models for broad-band sources, as observed by an array/delay-line structure, are developed. The models are termed broad-band source representation spaces, and are subspaces of the observation space. They are generated from eigenstructures of source sample covariance matrices and represent sources efficiently in the 2nd-order statistical sense. For a single b... View full abstract»

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  • Maximum-likelihood estimation of time-varying delay--Part I

    Publication Year: 1987, Page(s):300 - 313
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    This paper presents, for the first time, the exact theoretical solution to the problem of maximum-likelihood (ML) estimation of time-varying delay d(t) between a random signal s(t) received at one point in the presence of uncorrelated noise, and the time-delayed, scaled version αs(t - d(t)) of that signal received at another point in the presence of uncorrelated noise. The signal is modeled a... View full abstract»

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  • Adaptive hybrid balancing based on a novel recursive estimation algorithm and spectral analysis

    Publication Year: 1987, Page(s):397 - 399
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    This correspondence presents an investigation of a recursive estimation algorithm [1] (whose updates of estimates are information dependent) as applied to adaptive hybrid balancing in telephony. When compared to conventional schemes such as recursive least-squares (RLS) and stochastic gradient (SG) methods [2]-[7], the algorithm is superior in terms of the level of echo return loss and computation... View full abstract»

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  • Estimation of close sinusoids in colored noise and model discrimination

    Publication Year: 1987, Page(s):328 - 337
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    This paper considers the estimation of the two close dominant frequencies in the signal when it is known a priori that the observation is a sum of two close sinusoids and an additive colored noise whose spectral density is unknown. Earlier attempts have assumed the additive noise to be independent. Next we develop decision rules for checking whether the observed signal has only one sinusoid or two... View full abstract»

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  • On the shift property of DCT's and DST's

    Publication Year: 1987, Page(s):404 - 406
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The relationship between the family of DCT's and DST's of original sequence and shifted sequences is developed. While these properties are not as simple as the case for the DFT, they are still useful for processing long streams of data sequences where time-varying filtering is required. View full abstract»

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  • Multidimensional cyclic convolution algorithms with minimal multiplicative complexity

    Publication Year: 1987, Page(s):384 - 390
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    This paper presents novel multidimensional cyclic convolution algorithms which achieve the theoretically minimum number of multiplications. The proposed algorithms are compared to the well-known and used polynomial transform and split nesting convolution algorithms. View full abstract»

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  • Further results in Walsh domain filtering

    Publication Year: 1987, Page(s):394 - 397
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Zarowski and Yunik [1] demonstrated that an FIR filter can be realized with fewer multiplications in the fast Walsh transform (FWT) domain than in the fast Fourier transform (FFT) domain for some transform lengths. This correspondence investigates the symmetry and sparseness of the Walsh gain matrices. An efficient sparse matrix algorithm is used to calculate the Walsh gain matrix. View full abstract»

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  • A theory of multirate filter banks

    Publication Year: 1987, Page(s):356 - 372
    Cited by:  Papers (220)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1776 KB)

    Multirate filter banks produce multiple output signals by filtering and subsampling a single input signal, or conversely, generate a single output by upsampling and interpolating multiple inputs. Two of their main applications are subband coders for speech processing and transmultiplexers for telecommunications. Below, we derive a theoretical framework for the analysis, synthesis, and computationa... View full abstract»

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  • Estimation of probabilities from sparse data for the language model component of a speech recognizer

    Publication Year: 1987, Page(s):400 - 401
    Cited by:  Papers (236)  |  Patents (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The description of a novel type of m-gram language model is given. The model offers, via a nonlinear recursive procedure, a computation and space efficient solution to the problem of estimating probabilities from sparse data. This solution compares favorably to other proposed methods. While the method has been developed for and successfully implemented in the IBM Real Time Speech Recognizers, its ... View full abstract»

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  • Array shape calibration using sources in unknown locations--Part I: Far-field sources

    Publication Year: 1987, Page(s):286 - 299
    Cited by:  Papers (239)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    This paper deals with source localization using a two-dimensional array of sensors whose locations are not known precisely. If only a single source is observed, uncertainties in sensor location increase errors in source bearing and range by an amount which is independent of signal-to-noise ratio and which can easily dominate over-all localization accuracy. Major performance gains could therefore r... View full abstract»

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  • A comparison of two source azimuth estimation schemes

    Publication Year: 1987, Page(s):402 - 403
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    This correspondence compares two azimuth estimation schemes via a simulation, based on the estimated values and the corresponding variances. The comparison is an empirical one, and no claims are made about either scheme reaching the Cramer-Rao lower bound. Both of the schemes operate on single station data as opposed to standard techniques developed for array data. View full abstract»

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  • Two-channel likelihood detectors for arbitrary linear channel distortion

    Publication Year: 1987, Page(s):267 - 273
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    This paper derives likelihood and generalized likelihood detection test statistics for a set of two-channel problems. This set includes additive Gaussian and non-Gaussian noise, known signals, signals with unknown deterministic parameters, signals with unknown statistical parameters, and signals completely unknown. The set also includes arbitrary linear channel distortion, which is a generalizatio... View full abstract»

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  • Passive range estimation of an underwater maneuvering target

    Publication Year: 1987, Page(s):274 - 285
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    This paper examines the problem of adaptively tracking, in the horizontal ocean plane, an underwater maneuvering target using passive, time delay measurements. The target is free to make large scale random changes in velocity and bearing at times that are unknown to the observer. Tracking is accomplished by utilizing the basic linearized polar or "spherical" model of target and observer motion pre... View full abstract»

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  • Adaptive restoration of images with speckle

    Publication Year: 1987, Page(s):373 - 383
    Cited by:  Papers (330)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2080 KB)

    Speckle is a granular noise that inherently exists in all types of coherent imaging systems. The presence of speckle in an image reduces the resolution of the image and the detectability of the target. Many speckle reduction algorithms assume speckle noise is multiplicative. We instead model the speckle according to the exact physical process of coherent image formation. Thus, the model includes s... 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