IEEE Transactions on Acoustics, Speech, and Signal Processing

Volume 37 Issue 12 • Dec 1989

Filter Results

Displaying Results 1 - 25 of 30
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modularity and scaling in large phonemic neural networks

    Publication Year: 1989, Page(s):1888 - 1898
    Cited by:  Papers (72)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The authors train several small time-delay neural networks aimed at all phonemic subcategories (nasals, fricatives, etc.) and report excellent fine phonemic discrimination performance for all cases. Exploiting the hidden structure of these small phonemic subcategory networks, they propose several technique that make it possible to grow larger nets in an incremental and modular fashion without loss... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multifrequency channel decompositions of images and wavelet models

    Publication Year: 1989, Page(s):2091 - 2110
    Cited by:  Papers (1108)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A systolic neural network architecture for hidden Markov models

    Publication Year: 1989, Page(s):1967 - 1979
    Cited by:  Papers (29)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    The authors advocate a systolic neural network architecture for implementing the hidden Markov models (HMMs). A programmable systolic array is proposed which maximizes the power of VLSI implementations in terms of intensive and pipelined computing and yet circumvents the limitation on communication. A unified algorithmic formulation for recurrent back-propagation (RBP) networks and HMMs is exploit... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Formant speech synthesis: improving production quality

    Publication Year: 1989, Page(s):1870 - 1887
    Cited by:  Papers (26)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the application of hidden Markov models for enhancing noisy speech

    Publication Year: 1989, Page(s):1846 - 1856
    Cited by:  Papers (96)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The digital morphological sampling theorem

    Publication Year: 1989, Page(s):2067 - 2090
    Cited by:  Papers (51)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Array shape calibration using sources in unknown locations-a maximum likelihood approach

    Publication Year: 1989, Page(s):1958 - 1966
    Cited by:  Papers (154)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    Sensor location uncertainty can severely degrade the performance of direction-finding systems. An iterative maximum-likelihood method for simultaneously estimating directions of arrival (DOA) and sensor locations is developed to alleviate this problem. The case of nondisjoint sources, i.e., sources observed in the same frequency cell and at the same time, is emphasized. The algorithm converges to ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Image reconstruction and restoration: overview of common estimation structures and problems

    Publication Year: 1989, Page(s):2024 - 2036
    Cited by:  Papers (390)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1232 KB)

    Developments in the theory of image reconstruction and restoration over the past 20 or 30 years are outlined. Particular attention is paid to common estimation structures and to practical problems not properly solved yet. The problem of image reconstruction and restoration is first formulated. Some of the current regularization approaches used to solve the problem are then described. The concepts ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A pipelined FFT processor for word-sequential data

    Publication Year: 1989, Page(s):1982 - 1985
    Cited by:  Papers (109)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new look at DCT-type transforms

    Publication Year: 1989, Page(s):1899 - 1908
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A computationally efficient DCT- (discrete-cosine-transform) type orthogonal transform obtained by using a construction method developed by W. Kou and H. Zu (1986) is proposed. A recursive relation exists between a higher order and a lower order form of the kernel matrix of the transform and includes the DCT matrices as submatrices. The characteristics of the proposed transform and several fast tr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reconstructions from zero crossings in scale space

    Publication Year: 1989, Page(s):2111 - 2130
    Cited by:  Papers (99)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A fast and accurate single frequency estimator

    Publication Year: 1989, Page(s):1987 - 1990
    Cited by:  Papers (423)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A stochastic segment model for phoneme-based continuous speech recognition

    Publication Year: 1989, Page(s):1857 - 1869
    Cited by:  Papers (99)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Automatic and reliable estimation of glottal closure instant and period

    Publication Year: 1989, Page(s):1805 - 1815
    Cited by:  Papers (63)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance analysis of Root-Music

    Publication Year: 1989, Page(s):1939 - 1949
    Cited by:  Papers (408)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal stack filtering and the estimation and structural approaches to image processing

    Publication Year: 1989, Page(s):2037 - 2066
    Cited by:  Papers (137)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The limiting behavior of LMS

    Publication Year: 1989, Page(s):1909 - 1922
    Cited by:  Papers (42)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A signal processing view of strip-mapping synthetic aperture radar

    Publication Year: 1989, Page(s):2131 - 2147
    Cited by:  Papers (76)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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 (110)  |  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»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

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

Full Aims & Scope