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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 5 • October 1986

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Displaying Results 1 - 25 of 46
  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Comments on "A general method of minimum cross-entropy spectral estimation"

    Publication Year: 1986, Page(s):1324 - 1326
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    In a recent correspondence Tzannes et al. [1] introduced a new form of minimum cross-entropy (MCE) spectral analysis based on the observation that normalized spectra and symmetric probability density functions (pdf's) are axiomatically indistinguishable. Thus, the form of the minimum cross-entropy posterior pdf can be used as a model for spectral estimation. In this correspondence we derive the sa... View full abstract»

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  • Corrections to "Results on nonrecursive digital filters with nonequidistant taps"

    Publication Year: 1986, Page(s): 1336
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    First Page of the Article
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  • An explanation to the limitation observed in the Kumaresan-Prony algorithm

    Publication Year: 1986, Page(s):1338 - 1340
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB)

    In this correspondence we explain the limitation of the Kumaresan-Prony algorithm observed in [2]. It is shown that the condition number of the matrix involved with the associated least-squares problem periodically degrades (condition number rightarrow infin) making the least-squares solution ill conditioned. This ill conditioning causes a degradation in the estimates obtained by the Ku... View full abstract»

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  • Radar data processing: Vol. I - Introduction and tracking

    Publication Year: 1986, Page(s):1350 - 1351
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1986, Page(s): c4
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    Freely Available from IEEE
  • Optimization of one-bit full adders embedded in regular structures

    Publication Year: 1986, Page(s):1289 - 1300
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    We study the problem of optimizing the transistor sizes in the one-bit nMOS full adder either isolated or embedded in a regular array. A local optimization method that we call the critical-path optimization method is developed. In this method, two parameters at a time are changed along the critical path until a locally optimal choice of transistor sizes is found. The critical-path optimization met... View full abstract»

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  • Image reconstruction from zero crossings

    Publication Year: 1986, Page(s):1269 - 1277
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    This study is concerned with the information in zero crossings (ZC) of images. Logan's conditions, specifying when a one-dimensional signal may be recovered (within a multiplicative constant) from its ZC, are extended for various cases of two-dimensional signals. An algorithm is implemented in reconstruction of context-free band-pass images. It is also successfully applied in reconstruction of con... View full abstract»

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  • An analysis of the distributed arithmetic digital filter

    Publication Year: 1986, Page(s):1165 - 1170
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Distributed arithmetic filters have been shown to be an effective method of implementing linear shift-invariant filters. In this paper, the overall roundoff error budgets of admissible distributed arithmetic filter structures are compared to conventional lumped parameter and to each other. In addition, dynamic range considerations are also introduced into the study. View full abstract»

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  • Subband coding of images

    Publication Year: 1986, Page(s):1278 - 1288
    Cited by:  Papers (722)  |  Patents (95)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2200 KB)

    Subband coding has become quite popular for the source encoding of speech. This paper presents a simple yet efficient extension of this concept to the source coding of images. We specify the constraints for a set of two-dimensional quadrature mirror filters (QMF's) for a particular frequency-domain partition, and show that these constraints are satisfied by a separable combination of one-dimension... View full abstract»

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  • A modification of the Kumaresan-Tufts methods for estimating rational impulse responses

    Publication Year: 1986, Page(s):1336 - 1338
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    This correspondence presents a modification of the Kumaresan-Tufts algorithm for estimating the parameters of rational impulse responses in additive white noise. The modified algorithm uses the forward and backward predictors to select the signal poles, and then combines the two sets of poles to form the final estimates. The modified algorithm exhibits an improved robustness and a smaller bias in ... View full abstract»

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  • Projection approach to bearing estimations

    Publication Year: 1986, Page(s):1347 - 1349
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Bearing estimations based on the projection approach are discussed. A method is presented which computes a projection matrix by using any M rows of the covariance matrix, where M is the number of radiation sources. This method requires considerably fewer computations than projection techniques using eigenvectors, especially when the number of array elements is much larger than the number of source... View full abstract»

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  • A high-quality digital filterbank for speech recognition which runs in real time on a standard microprocessor

    Publication Year: 1986, Page(s):1064 - 1073
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1336 KB)

    Asynchronous digital filterbank or LPC output is widely used for high-quality research and commercial speech recognition applications. Special-purpose hardware is usually applied. In this paper, a decimation/DFT filterbank system is described which may be implemented in real time on a standard microprocessor. Key features of the approach are a dithering technique, which allows output sampling at a... View full abstract»

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  • Stochastic operator norms for two-parameter adaptive lattice filters

    Publication Year: 1986, Page(s):1162 - 1164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Expressions are derived for bounds on average output power in lattice filters with unequal forward and backward reflection coefficients, such as arise in the adaptive least-squares lattice algorithms [3]. It is shown that under stationary, noisy conditions, these bounds will in general be larger than in the case of equal forward and backward reflection coefficients, as in the adaptive gradient lat... View full abstract»

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  • Nonlinear space-variant postprocessing of block coded images

    Publication Year: 1986, Page(s):1258 - 1268
    Cited by:  Papers (191)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2256 KB)

    An important application of spatial filtering techniques is in the postprocessing of images degraded by coding. Linear, space-invariant filters are inadequate to reduce the noise produced by block coders. The noise in block coded images is correlated with the local characteristics of the signal, and such filters are unable to exploit this correlation to reduce the noise. We propose a new nonlinear... View full abstract»

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  • A ring array processor architecture for highly parallel dynamic time warping

    Publication Year: 1986, Page(s):1310 - 1318
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    A ring array architecture is studied on a hardware algorithm and a control scheme for dynamic time warping (DTW) processing, in order to achieve real-time speech recognition. For developing a practical DTW processor, the key factors are to reduce the number of processing elements (PE's) in the array architecture and to maintain highly efficient concurrency and high throughput. Regular data and con... View full abstract»

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  • Modeling and identification of symmetric noncausal impulse responces

    Publication Year: 1986, Page(s):1171 - 1181
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Spectrally equivalent causal (SEC) models for single-input/single-output noncausal systems are derived with the objective of estimating the noncausal impulse response. Attention is restricted to symmetric, noncausal impulse responses, and the measurements of the system output are assumed to be noisy. It is shown that by using structured SEC models, either state-space or ARMA-plus-noise, consistent... View full abstract»

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  • Broad-band beamforming and the generalized sidelobe canceller

    Publication Year: 1986, Page(s):1322 - 1323
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This correspondence identifies general conditions under which the generalized sidelobe canceller (GSC) structure implements a linearly constrained minimum variance (LCMV) broad-band beam-former. In previously published work, conditions have been presented for the case in which the linear constraint is restricted to fixed gain in the steer direction. Here, that work is extended to include general l... View full abstract»

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  • Regular-pulse excitation--A novel approach to effective and efficient multipulse coding of speech

    Publication Year: 1986, Page(s):1054 - 1063
    Cited by:  Papers (99)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    This paper describes an effective and efficient time domain speech encoding technique that has an appealing low complexity, and produces toll quality speech at rates below 16 kbits/s. The proposed coder uses linear predictive techniques to remove the short-time correlation in the speech signal. The remaining (residual) information is then modeled by a low bit rate reduced excitation sequence that,... View full abstract»

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  • Analysis/Synthesis filter bank design based on time domain aliasing cancellation

    Publication Year: 1986, Page(s):1153 - 1161
    Cited by:  Papers (232)  |  Patents (131)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A single-sideband analysis/synthesis system is proposed which provides perfect reconstruction of a signal from a set of critically sampled analysis signals. The technique is developed in terms of a weighted overlap-add method of analysis/synthesis and allows overlap between adjacent time windows. This implies that time domain aliasing is introduced in the analysis; however, this aliasing is cancel... View full abstract»

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  • Detection of wave reflectors and wave sources in the earth subsurface

    Publication Year: 1986, Page(s):1245 - 1257
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    Event detection is a very important task in geophysics. It encompasses the detection of wave sources (earthquakes, subsurface explosions) and the detection of wave reflectors (interfaces between rock layers having different velocities and/or different densities). The latter application is very important in seismic oil prospecting. Seismic events release energy which propagates toward the earth sur... View full abstract»

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  • A new scheme for designing IIR filters with finite wordlength coefficients

    Publication Year: 1986, Page(s):1335 - 1336
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A scheme for designing IIR digital filters, with specified coefficient wordlengths based on successive digitization and reoptimization, is presented and compared to related approaches via a number of design examples. The ordered digitization of the coefficients based on their sensitivity, with each digitization followed by reoptimization of the remaining coefficients, results in a much reduced com... View full abstract»

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  • Measurement of spectral correlation

    Publication Year: 1986, Page(s):1111 - 1123
    Cited by:  Papers (148)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    Various methods for measurement/computation of spectral correlation functions for time series that exhibit cyclostationarity are described in a unifying theoretical framework. Some of these are amenable to digital hardware or software implementations, others are amenable to analog electrical or optical implementations, and other implementation types used for conventional spectral analysis are also... View full abstract»

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  • Simple, effective computation of principal eigenvectors and their eigenvalues and application to high-resolution estimation of frequencies

    Publication Year: 1986, Page(s):1046 - 1053
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    We present the results of an investigation of the Prony-Lanczos (P-L) method [14], [38] and the power method [39] for simple computation of approximations to a few eigenvectors and eigenvalues of a Hermitian matrix. We are motivated by realization of high-resolution signal processing in an integrated circuit. The computational speeds of the above methods are analyzed. They are completely dependent... View full abstract»

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  • A multimicroprocessor architecture for real-time computation of a class of DFT algorithms

    Publication Year: 1986, Page(s):1301 - 1309
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    The design of a multimicroprocessor system intended for a class of real-time processing applications is discussed. The applications considered require the computation of a subset of an N-input Fourier transform under the assumption of a serial data input. The suitability of two different algorithms and the corresponding parallel architectures is analyzed and compared. More specifically, we compare... 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