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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 10 • Date Oct. 1988

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Displaying Results 1 - 20 of 20
  • Comments on "A two-stage representation of DFT and its applications" by O.K. Ersoy

    Publication Year: 1988
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    In the above named paper (ibid., vol.ASSP-35, p.825-831), Ersoy developed a two-stage representation in terms of processing and postprocessing of a discrete Fourier transform (DFT) by vector transformation of sines and cosines into new basis functions using Mobius inversion of number theory. Three corrections of Ersoy's work are printed out.<> View full abstract»

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  • Block implementation of a recursive least squares estimation algorithm

    Publication Year: 1988, Page(s):1671 - 1675
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A block implementation of a Schur-type algorithm for the recursive least-squares problem using parallel processors is described. The parallel architecture can simultaneously process block data in one hardware clock cycle with regularly and locally connected processing elements. Such a computing structure is desirable for VLSI implementation. Moreover, a latency penalty is on the order of the block... View full abstract»

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  • Almost sure convergence of a decreasing gain sign algorithm for adaptive filtering

    Publication Year: 1988, Page(s):1669 - 1671
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The convergence analysis of a sign algorithm with decreasing gain, when governing the weights of an adaptive filter, is presented. The analysis is done in a noiseless case. A rigorous proof of almost-sure convergence to the optimal filter is attained under a weak-ergodicity assumption that includes the case, important in practice, of correlated observations View full abstract»

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  • Statistics of bicoherence

    Publication Year: 1988, Page(s):1667 - 1668
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Numerical simulations are used to investigate statistics of biocoherence for the special case of a linear random process. Smoothed bicoherence statistics are shown to be independent of both the normalization used to form the bicoherence and of whether statistical stability is obtained by ensemble-averaging short records, or frequency merging within a long record View full abstract»

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  • A new systolic array for discrete Fourier transform

    Publication Year: 1988, Page(s):1665 - 1666
    Cited by:  Papers (31)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    An approach for realizing the N-point discrete Fourier transform (DFT) of an input sequence is presented. It is then combined with H.T. King's (1981) approach to construct a two-dimensional array for computing the two-dimensional DFT. This mixed model takes stream input and produces stream output. In addition, no extra I/O time delay is required before performing the row (column) transfor... View full abstract»

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  • Systolic architectures for vector quantization

    Publication Year: 1988, Page(s):1651 - 1664
    Cited by:  Papers (62)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1316 KB)

    A family of architectural techniques are proposed which offer efficient computation of weighted Euclidean distance measures for nearest-neighbor codebook searching. The general approach uses a single metric comparator chip in conjunction with a linear array of inner product processor chips. Very high vector-quantization (VQ) throughout can be achieved for many speech and image-processing applicati... View full abstract»

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  • In-place butterfly-style FFT of 2-D real sequences

    Publication Year: 1988, Page(s):1642 - 1650
    Cited by:  Papers (26)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Methodologies for constructing fast algorithms to compute the discrete Fourier transform (DFT) of a 2-D real sequence are introduced. The resulting algorithms are shown to be in-place and butterfly-style as well as the usual 1-D FFT algorithms. Above all, the computational load of these algorithms is reduced to less than one-half of their complex counterparts. Due to the in-place property, the sto... View full abstract»

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  • General synthesis procedures for FIR lossless transfer matrices, for perfect-reconstruction multirate filter bank applications

    Publication Year: 1988, Page(s):1561 - 1574
    Cited by:  Papers (68)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    A recently reported procedure (see ibid., vol.ASSP-35, p.476-492, Apr. 1987 and Proc. IEEE Int. Conf. Acoust., Speech, Sig Processing, Apr. 1987, p.2169-2172) for the design of M-channel perfect-reconstruction quadrature mirror filter (QMF) bands uses the concept of lossless alias-component matrices. The synthesis of such QMF banks centers around the generation of a lossless M&ti... View full abstract»

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  • The Wigner distribution of linear time-variant systems

    Publication Year: 1988, Page(s):1681 - 1684
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The Wigner distribution relation between the two input and output time-varying spectra of the linear time-variant system is derived. This mathematical relationship can show how a time-variant system modifies the time-varying spectrum of the input to determine that of the output, and this result will be very useful for time-variant filtering in the mixed time-frequency domain. A linear time-variant... View full abstract»

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  • Robust parametric approach for impulse response estimation

    Publication Year: 1988, Page(s):1592 - 1601
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A parametric technique for estimating the impulse response of a linear system using input-output observations in an outlier and distributionally uncertain environment is presented. The use of various cost functions for fitting the chosen output error model are discussed. By simulation, it is shown that the parametric approach based on the use of Huber's function as a criterion for fitting the mode... View full abstract»

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  • Adaptive segmentation of speckled images using a hierarchical random field model

    Publication Year: 1988, Page(s):1628 - 1641
    Cited by:  Papers (90)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1860 KB)

    A two-level hierarchical random-field model developed for speckled images and, in particular, for synthetic-aperture radar (SAR) imagery, is described. At the higher level is a Gibbs random field governing the grouping of image pixels into regions, while at the lower level are speckle processes for the different regions, which are also modeled as random fields. In accordance with the physical phen... View full abstract»

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  • Identification of linear modulated FM signal via a new recursive modified response error method (REM)

    Publication Year: 1988, Page(s):1675 - 1679
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Identification scheme for estimating the carrier frequency and rate of change of frequency is reported. This method is based on a response error method. Many recursive methods for identification of ARMA (p, z) model parameters are available in the technical literature. The current method is based on gradient methods and has its roots in nonlinear optimization. The problem is to e... View full abstract»

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  • Maximum likelihood localization of multiple sources by alternating projection

    Publication Year: 1988, Page(s):1553 - 1560
    Cited by:  Papers (627)  |  Patents (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    An algorithm, referred to as APM, for computing the maximum-likelihood estimator of the locations of simple sources in passive sensor arrays is presented. The algorithm is equally applicable to the case of coherent signals and to the case of a single snapshot. The algorithm is iterative; the maximum of the likelihood function is computed by successive approximations. The convergence of the algorit... View full abstract»

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  • On hardware implementation of the split-radix FFT

    Publication Year: 1988, Page(s):1575 - 1581
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An algorithm for computing length-2M discrete Fourier transforms (DFTs), called the split-radix FFT, has recently been developed. The split-radix algorithm has fewer multiplies than the radix-8 Cooley-Tukey algorithm, and many fewer additions that the minimum-multiply algorithms. It is shown that it involves significantly more butterfly computations than the radix-4 Cooley-Tukey algorit... View full abstract»

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  • Recognition of Chinese diphones

    Publication Year: 1988, Page(s):1684 - 1687
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Recognition of isolated Chinese Words is examined, with more emphasis on diphones. Under nearly identical test conditions, speaker-dependent recognition rates were obtained as follows: (1) 76.3% for 59 Chinese phonetic units: (2) 95% for 40 monophones; and (3) 99.5% for 100 diphones. With three speakers, the recognition rate of 100 diphones become 94% View full abstract»

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  • Autoregressive models with time-dependent log area ratios

    Publication Year: 1988, Page(s):1602 - 1612
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    A large class of stationary signals, containing speech signals, but not restricted to them, can be represented by time-varying models, the coefficients of which are finite linear combinations of known time functions. Such models have been found useful for speech recognition and speech synthesis, but they suffer in this last application from a lack of stability. A time-varying area-ratio (AR) model... View full abstract»

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  • Linear complexity parallel algorithm for discrete-time Wiener filters with optimum lag

    Publication Year: 1988, Page(s):1680 - 1681
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A parallel algorithm of linear complexity for efficient updating of the solution of a Toeplitz system of equations with a shifted right hand side is presented. If in the initial system, the right-hand side is f=f(0), . . ., f(N), the whole computation will take 6N+1 multiplications/divisions and 3N+1 additions/subtractions per processor View full abstract»

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  • On performance improvement of tone frequency estimation

    Publication Year: 1988, Page(s):1582 - 1591
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    A approach for tone resolution and estimation problems in applications such as pulse Doppler processing and direction finding is presented. The approach, based on frequency-diversity signaling and coherent wideband high-resolution processing, is shown to significantly outperform those using the conventional signaling and narrowband high-resolution processing under the equal-transmitted-energy cons... View full abstract»

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  • Eigenstructure approach for array processing with unknown intensity coefficients

    Publication Year: 1988, Page(s):1613 - 1617
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The eigenstructure approach for array processing is examined for the general case in which it is necessary to estimate several parameters related to the directional patterns of the sources and the sensors, as well as parameters related to the location of the sources. The assumption of the MUSIC algorithm that any given source is observed by all the sensors with the same intensity is removed, and h... View full abstract»

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  • On detecting edges in speckle imagery

    Publication Year: 1988, Page(s):1618 - 1627
    Cited by:  Papers (79)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    Methods for detecting sustained intensity changes in images corrupted by speckle are analyzed. The problem is complicated by the nature of the speckle, which is characterized by a high degree of correlation and (approximately multiplicative) signal dependence. These characteristics make the automated extraction of edges in speckle very difficult for applications requiring the location and identifi... 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