IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 12 • Dec 1989

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Displaying Results 1 - 25 of 30
  • Multifrequency channel decompositions of images and wavelet models

    Publication Year: 1989, Page(s):2091 - 2110
    Cited by:  Papers (1077)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1720 KB)

    The author reviews recent multichannel models developed in psychophysiology, computer vision, and image processing. In psychophysiology, multichannel models have been particularly successful in explaining some low-level processing in the visual cortex. The expansion of a function into several frequency channels provides a representation which is intermediate between a spatial and a Fourier represe... View full abstract»

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  • A fast and accurate single frequency estimator

    Publication Year: 1989, Page(s):1987 - 1990
    Cited by:  Papers (409)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A novel frequency estimator for a single complex sinusoid in complex white Gaussian noise is proposed. The estimator is more computationally efficient that the optimal maximum-likelihood estimator yet attains equally good performance at moderately high signal-to-noise ratios. The estimator is shown to be related to the linear prediction estimator. This relationship is used to reveal why the linear... View full abstract»

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  • The digital morphological sampling theorem

    Publication Year: 1989, Page(s):2067 - 2090
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1952 KB)

    Morphological sampling reduces processing time and cost and yet produces results sufficiently close to the result of full processing. A morphological sampling theorem is described which states: (1) how a digital image must be morphologically filtered before sampling in order to preserve the relevant information after sampling; (2) to what precision an appropriate morphologically filtered image can... View full abstract»

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  • Unsupervised speaker adaptation based on hierarchical spectral clustering

    Publication Year: 1989, Page(s):1923 - 1930
    Cited by:  Papers (21)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The author proposes an automatic speaker adaptation algorithm for speech recognition, in which a small amount of training material of unspecified text can be used. The algorithm is easily applied to vector-quantization- (VQ) speech recognition systems consisting of a VQ codebook and a word dictionary in which each word is represented as a sequence of codebook entries. In the adaptation algorithm, ... View full abstract»

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  • Simple method for generation of multiple normal random signals

    Publication Year: 1989, Page(s):1985 - 1987
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A set of N weighting functions for N digital filters that is based on an even-shift orthogonal sequence is proposed. The filter can generate N uncorrelated random signals from a single binary random signal. All distribution functions of the generated random signals become the same normal distribution. The generation speed is a function of N and does not depend o... View full abstract»

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  • A position recognition algorithm for semiconductor alignment based on structural pattern matching

    Publication Year: 1989, Page(s):2148 - 2157
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The authors propose a position recognition algorithm that can be used for future automated production of high-density semiconductor devices. It consists of a position detection method based on a pattern structure which is expressed as the distribution of characteristic local patterns, and an adaptive thresholding method based on an evaluation index which represents the binary state of characterist... View full abstract»

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  • An unrestricted vocabulary Arabic speech synthesis system

    Publication Year: 1989, Page(s):1829 - 1845
    Cited by:  Papers (30)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    A method for synthesizing Arabic speech has been developed which uses a reasonably sized set of subphonetic elements as the synthesis units to allow synthesis of unlimited-vocabulary speech of good quality. The synthesis units have been defined after a careful study of the phonetic properties of modern standard Arabic, and they consist of central steady-state portions of vowels, central steady-sta... View full abstract»

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  • Optimal stack filtering and the estimation and structural approaches to image processing

    Publication Year: 1989, Page(s):2037 - 2066
    Cited by:  Papers (136)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4076 KB)

    Two approaches have been used in the past to design rank-order based nonlinear filters for enhancing or restoring images: the structural approach and the estimation approach. The first approach requires structural descriptions of the image and the process which has altered it, whereas the second requires statistical descriptions of the image and the process which has altered it. The many different... View full abstract»

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  • Minimization of roundoff errors in digital realizations of Kalman filters

    Publication Year: 1989, Page(s):1980 - 1982
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A comparison between D. Williamson's method (IEEE Trans. Autom. Contr., vol.AC-30, p.930-9, 1985) and the 0-1 method for the design of the digital Kalman filter is made. The 0-1 method is shown to be much better than Williamson's method and the other methods from the estimation-error pint of view, whereas Williamson's method is slightly better than the 0-1 method from the computation-time point of... View full abstract»

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  • The limiting behavior of LMS

    Publication Year: 1989, Page(s):1909 - 1922
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    A realization-oriented analysis is given of the gradient noise misadjustment and lag misadjustment performance of the LMS (least-mean-square) algorithm. New formulas are given for both of these components of excess mean-square error. It is shown that the traditional formula for lag misadjustment needs to be modified by adding further terms due to gradient noise and noise variance. To perform the a... View full abstract»

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  • Reconstructions from zero crossings in scale space

    Publication Year: 1989, Page(s):2111 - 2130
    Cited by:  Papers (96)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2036 KB)

    In computer vision, the one-parameter family of images obtained from the Laplacian-of-a-Gaussian-filtered version of the image, parameterized by the width of the Gaussian, has proved to be a useful data structure for the extraction of feature data. In particular, the zero crossings of this so-called scale-space data are associated with edges and have been proposed by D. Marr (1982) and others as t... View full abstract»

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  • Automatic and reliable estimation of glottal closure instant and period

    Publication Year: 1989, Page(s):1805 - 1815
    Cited by:  Papers (62)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    The authors present an automatic and reliable algorithm for determining glottal closure instant (GCI). As a byproduct, nonstationary fundamental period estimation is achieved. The computation includes twelve-pole speech linear-prediction analysis, cross correlation, and both direct and inverse fast Fourier transforms (or a convolution). Maximum-likelihood epoch determination is used as the basis f... View full abstract»

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  • Performance analysis of ESPRIT and TAM in determining the direction of arrival of plane waves in noise

    Publication Year: 1989, Page(s):1990 - 1995
    Cited by:  Papers (101)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The authors evaluate two subspace-based methods, ESPRIT and the Toplitz approximation method (TAM), for estimating the direction of arrival (DOA) of plane waves in white noise in the case of linear equispaced sensor array. It is shown that the least-squares versions of ESPRIT and TAM result in the same estimate and are statistically equivalent. It is also shown that, asymptotically, the estimates ... View full abstract»

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  • On the existence of autoregressive models for third-order cumulant matching

    Publication Year: 1989, Page(s):1931 - 1938
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Necessary and sufficient conditions are provided for the third-moment sequence of a white-noise-driven finite-order AR (autoregressive) model to match given samples of the third-moment sequence of an arbitrary stationary process. The conditions lead to a set of nonlinear equations that are solved for the model parameters. A method for finding the third-moment sequence of a white-noise-driven AR mo... View full abstract»

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  • SIMD architectures and algorithms for image processing and computer vision

    Publication Year: 1989, Page(s):2158 - 2174
    Cited by:  Papers (39)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1852 KB)

    The authors present a critical survey of parallel architectures and algorithms for image processing. The emphasis is on single-instruction-stream, multiple-data-stream (SIMD) computers with nonshared memory. A number of parallel architectures are discussed and compared. They fall into three categories: mesh-connected computers, pyramid computers, and hypercube and related computers. A set of seven... View full abstract»

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  • On the application of hidden Markov models for enhancing noisy speech

    Publication Year: 1989, Page(s):1846 - 1856
    Cited by:  Papers (91)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    A maximum-a-posteriori approach for enhancing speech signals which have been degraded by statistically independent additive noise is proposed. The approach is based on statistical modeling of the clean speech signal and the noise process using long training sequences from the two processes. Hidden Markov models (HMMs) with mixtures of Gaussian autoregressive (AR) output probability distributions (... View full abstract»

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  • A pipelined FFT processor for word-sequential data

    Publication Year: 1989, Page(s):1982 - 1985
    Cited by:  Papers (104)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A modified fast Fourier transform algorithm is described together with a real-time pipelined implementation. The approach is particularly suited to sequentially presented input data. The method can be used for both mixed and uniform radix number implementations. For example, for the radix-4 implementation, the method requires less data memory and only 1/3 of the number of complex multipliers of a ... View full abstract»

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  • A signal processing view of strip-mapping synthetic aperture radar

    Publication Year: 1989, Page(s):2131 - 2147
    Cited by:  Papers (73)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1468 KB)

    The authors derive the fundamental strip-mapping SAR (synthetic aperture radar) imaging equations from first principles. They show that the resolution mechanism relies on the geometry of the imaging situation rather than on the Doppler effect. Both the airborne and spaceborne cases are considered. Range processing is discussed by presenting an analysis of pulse compression and formulating a mathem... View full abstract»

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  • Interprocessor communication in synchronous multiprocessor digital signal processing chips

    Publication Year: 1989, Page(s):1816 - 1828
    Cited by:  Papers (17)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1312 KB)

    The authors discuss interprocessor communication in synchronous multiprocessor DSP (digital signal processing) chips, the types of systems that are synthesized by the Cathedral II silicon compiler. A model for the data flow between two processors is presented. A number of architectural possibilities are discussed. Key concepts are a double-buffered memory cell and an extended method of pointer add... View full abstract»

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  • Matrix based computation of floating-point roundoff noise

    Publication Year: 1989, Page(s):1995 - 1998
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    A matrix-based procedure is presented for computing the output roundoff power for filters implemented with floating-point arithmetic. The filter's computational structure is represented in terms of a product of matrices, known as a factored state variable description. The quantities needed to compute the output roundoff noise power are obtained from the factored state variable description by matri... View full abstract»

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  • Performance analysis of Root-Music

    Publication Year: 1989, Page(s):1939 - 1949
    Cited by:  Papers (379)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The authors analyze the performance of Root-Music, a variation of the MUSIC algorithm, for estimating the direction of arrival (DOA) of plane waves in white noise in the case of a linear equispaced sensor array. The performance of the method is analyzed by examining the perturbation in the roots of the polynomial formed in the intermediate step of Root-Music. In particular, asymptotic results for ... View full abstract»

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  • A stochastic segment model for phoneme-based continuous speech recognition

    Publication Year: 1989, Page(s):1857 - 1869
    Cited by:  Papers (96)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1336 KB)

    The authors introduce a novel approach to modeling variable-duration phonemes, called the stochastic segment model. A phoneme X is observed as a variable-length sequence of frames, where each frame is represented by a parameter vector and the length of the sequence is random. The stochastic segment model consists of (1) a time warping of the variable-length segment X into a fixed... View full abstract»

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  • Image coding-from waveforms in animation

    Publication Year: 1989, Page(s):2008 - 2023
    Cited by:  Papers (87)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1624 KB)

    The main coding techniques for efficient electronic representation of grayscale images are reviewed. The emphasis is on understanding some of the reasons behind the development of different coding structures. It is shown that various (conscious or unconscious) models of the scene, the image, and the visual system have been and are still being used as the driving source for the construction of codi... View full abstract»

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  • Fixed-point error analysis of the lattice and the Schur algorithms for the autocorrelation method of linear prediction

    Publication Year: 1989, Page(s):1950 - 1957
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Levinson recursions, Schur recursions, and lattice recursions provide three different ways of computing reflection coefficients for a stationary time series. Of these three approaches, only the Schur and lattice algorithms are scaled algorithms that can be implemented in fixed-point arithmetic. The authors study the finite arithmetic properties of the Schur and lattice recursions. They derive erro... View full abstract»

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  • Formant speech synthesis: improving production quality

    Publication Year: 1989, Page(s):1870 - 1887
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    The authors describe analysis and synthesis methods for improving the quality of speech produced by D.H. Klatt's (J. Acoust. Soc. Am., vol.67, p.971-95, 1980) software formant synthesizer. Synthetic speech generated using an excitation waveform resembling the glotal volume-velocity was found to be perceptually preferred over speech synthesized using other types of excitation. In addition, listener... 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