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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 6 • Date June 1987

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Improved ARMA spectral estimation using the canonical variate method

    Publication Year: 1987, Page(s):900 - 903
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB)

    The canonical variate method of rational system identification is investigated here for its performance in a high-resolution spectral analysis environment. A computationally simple version of the method, due to White [9], is briefly reviewed and applied to several standard examples. It is found that, at the cost of some computational complexity, the method is capable of yielding significantly impr... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): c4
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    Freely Available from IEEE
  • Fixed-point roundoff error analysis of the exponentially windowed RLS algorithm for time-varying systems

    Publication Year: 1987, Page(s):770 - 783
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    A fixed-point roundoff error analysis of the exponentially windowed RLS algorithm is presented. It is shown that a tradeoff exists in the choice of the forgetting factor λ. In order to reduce the sensitivity of the algorithm to additive noise, λ must be chosen close to one. On the other hand, the roundoff error increases as \lambda \rightarrow 1 . ... View full abstract»

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  • The design of optimal uniform filter banks with specified composite response

    Publication Year: 1987, Page(s):807 - 817
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    In this paper we prove that for suitable design specifications and a wide class of optimization criteria, the optimal complex filter bank with specifications on its composite response is composed of frequency translated versions of a prototype filter. In particular, this holds for the min-max and WMMSE (weighted minimum mean square error) criteria. As a result, a simplified design problem whose so... View full abstract»

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  • A systolic array for computing B A-1

    Publication Year: 1987, Page(s):717 - 723
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    This paper is devoted to the design of a new systolic array of n (n + 1) elementary processors which computes B A-1within 4n + p - 2 time steps, where A is a dense (nonsingular) n by n matrix, B is a dense p by n matrix. The array can be directly extended to compute the vector Y = B A-1R, where R is a vector with n components. Such computations arise frequently in signal proc... View full abstract»

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  • Dynamic speaker adaptation for feature-based isolated word recognition

    Publication Year: 1987, Page(s):751 - 763
    Cited by:  Papers (15)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1568 KB)

    In this paper, we describe efforts to improve the performance of FEATURE, the Carnegie-Mellon University speaker-independent speech recognition system that classifies isolated letters of the English alphabet by enabling the system to learn the acoustical characteristics of individual speakers. Even when features are designed to be speaker-independent, it is frequently observed that feature values ... View full abstract»

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  • Wigner distribution for finite duration or band-limited signals and limiting cases

    Publication Year: 1987, Page(s):796 - 806
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Explicit expressions are given for the evaluation of the Wigner distribution for the case where the signal is of finite duration (or finite bandwidth), and where the functional form of the signal is given by two different expressions. Furthermore, the case where the signal is zero for a time (or frequency band) between the two regions is considered. This general case encompasses many particular ca... View full abstract»

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  • Canonical pipelining of lattice filters

    Publication Year: 1987, Page(s):878 - 887
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A variant of the lattice form is proposed in which delay elements are placed on both the upper (feedforward) path and the lower (feedback) path alternately. Although this new form preserves the fundamental characteristics of the usual lattice form having all the delay elements on the lower (feedback) path, it has some practical advantages. First, it represents a completely pipelined systolic-type ... View full abstract»

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  • A further analysis for the minimum-variance deconvolution filter performance

    Publication Year: 1987, Page(s):888 - 889
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Chi and Mendel [1], [9] analyzed the performance of the minimum-variance deconvolution (MVD). In this correspondence, a further analysis of the performance of the MVD filter is presented. We show that the MVD filter performs like an inverse filter and a whitening filter as SNR \rightarrow \infty , and like a matched filter as View full abstract»

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  • Improved Fourier and Hartley transform algorithms: Application to cyclic convolution of real data

    Publication Year: 1987, Page(s):818 - 824
    Cited by:  Papers (60)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    This paper highlights the possible tradeoffs between arithmetic and structural complexity when computing cyclic convolution of real data in the transform domain. Both Fourier and Hartley-based schemes are first explained in their usual form and then improved, either from the structural point of view or in the number of operations involved. Namely, we first present an algorithm for the in-place com... View full abstract»

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  • Phase reconstruction in the trispectrum domain

    Publication Year: 1987, Page(s):895 - 897
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The phase reconstruction problem in the trispectrum domain is addressed in this correspondence. In particular, three different reconstruction algorithms are discussed and their performance is evaluated. The first two algorithms are recursive in nature and are shown to be sensitive to initial condition estimates. View full abstract»

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  • Multidimensional filters for high-speed processing

    Publication Year: 1987, Page(s):904 - 907
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A new digital filter structure is developed for the realization of multidimensional recursive filters used in high-speed processing. The structure possesses a high throughput rate, which depends on the dimensionality m of the filter, but is independent of its order. The features that contribute to its high-speed performance include both parallelism and pipelining. The clock cycle of the proposed f... View full abstract»

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  • Array shape calibration using sources in unknown locations--Part II: Near-field sources and estimator implementation

    Publication Year: 1987, Page(s):724 - 735
    Cited by:  Papers (82)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Uncertainty concerning sensor locations can seriously degrade the ability of an array to estimate the location of radiating sources. Array calibration then becomes an important issue. This paper deals with array calibration using spectrally disjoint near-field sources whose locations are not known a priori. It calculates Cramer-Rao bounds on source location and array shape errors. It shows that, w... View full abstract»

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  • Optimum smoothing of the Wigner--Ville distribution

    Publication Year: 1987, Page(s):764 - 769
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A compromise is found between the different requirements that we would like to be fulfilled by a time frequency distribution, namely, positivity and obtention of a distribution close to the Dirac one for the unimodular signal s(t) = \exp i\phi (t) (the fulfillment of the marginal conditions being of less interest in signal theory). Starting from the usual Wi... View full abstract»

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  • A spectral autocorrelation method for measurement of the fundamental frequency of noise-corrupted speech

    Publication Year: 1987, Page(s):741 - 750
    Cited by:  Papers (19)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    A method for measurement of the fundamental frequency of a voiced speech signal corrupted by high levels of additive white Gaussian noise is described. The method is based on flattening the spectrum of the signal by a bank of bandpass lifters and extracting the pitch frequency from autocorrelation functions calculated at the output of the lifters. A smoothing modified median filter is applied to t... View full abstract»

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  • A two-stage representation of DFT and its applications

    Publication Year: 1987, Page(s):825 - 831
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    A two-stage representation in terms of preprocessing and postprocessing of DFT is developed by vector transformation of sines and cosines into new basis functions using Möbius inversion of number theory. The preprocessing matrix, with elements 1, -1, and 0, is obtained by replacing \cos 2p\in / N and \sin 2\pi n / N...
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  • Reconstruction of nonperiodic two-dimensional signals from zero crossings

    Publication Year: 1987, Page(s):890 - 893
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    In this correspondence, we present new results on the reconstruction of two-dimensional signals from zero crossing or threshold crossing information. Specifically, we develop new theoretical results which state conditions under which two-dimensional bandlimited signals are uniquely specified to within a scale factor with this information. Unlike previous results in this area, our new results do no... View full abstract»

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  • Auditory nerve representation criteria for speech analysis/Synthesis

    Publication Year: 1987, Page(s):736 - 740
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Traditional speech analysis/synthesis techniques are designed to produce synthesized speech with a spectrum (or waveform) that is as close as possible to the original. It is suggested, instead, that representations of the synthetic and the original speech be matched at the auditory nerve level. This concept has been used in conjunction with the sinusoidal representation of speech analysis/synthesi... View full abstract»

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  • Roundoff noise analysis for digital signal power processors using Welch's power spectrum estimation

    Publication Year: 1987, Page(s):784 - 795
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    In this paper, we present an analysis for the noise due to finite word length effects for digital signal power processors using Welch's power spectrum estimation technique to measure the power of Gaussian random signals over a frequency band of interest. The input of the digital signal processor contains a finite-length time interval in which the true Gaussian signal is contaminated by Gaussian no... View full abstract»

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  • Design and implementation of velocity filters using multichannel array processing techniques

    Publication Year: 1987, Page(s):864 - 877
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    A general procedure for designing two-dimensional velocity filters, based on array filters derived originally for multichannel (multiple-input single-output) processing of the recordings of an array of sensors, is presented. The mathematical expressions needed for implementation of the filters using the two-dimensional fast Fourier transform are derived. A specific derivation of the velocity filte... View full abstract»

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  • Radar detection in coherent Weibull clutter

    Publication Year: 1987, Page(s):893 - 895
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    In this correspondence, a new model for the Weibull clutter is presented. Then attention is turned to the design of the optimum radar processor to detect an a priori known target signal embedded in coherent Weibull clutter. An original detection scheme is presented and the corresponding performance is assessed. View full abstract»

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  • FIR-median hybrid filters

    Publication Year: 1987, Page(s):832 - 838
    Cited by:  Papers (127)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    This paper introduces a new generalized class of median-type filters which we call FIR-median hybrid (FMH) filters. The input signal x(n) is filtered with M linear phase FIR filters, and the output of the FMH filter is the median of the outputs of the FIR filters. The statistical properties of the FMH filters are analyzed for input signals with Gaussian, double exponential, and uniform density fun... View full abstract»

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  • Real-valued fast Fourier transform algorithms

    Publication Year: 1987, Page(s):849 - 863
    Cited by:  Papers (143)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1320 KB)

    This tutorial paper describes the methods for constructing fast algorithms for the computation of the discrete Fourier transform (DFT) of a real-valued series. The application of these ideas to all the major fast Fourier transform (FFT) algorithms is discussed, and the various algorithms are compared. We present a new implementation of the real-valued split-radix FFT, an algorithm that uses fewer ... View full abstract»

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  • The Levinson recurrence and fast algorithms for solving Toeplitz systems of linear equations

    Publication Year: 1987, Page(s):839 - 848
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    This work brings together classical polynomial theory as it relates to the Levinson recurrence for a Hermitian Toeplitz operator and matrix theory as it relates to the class of Hermitian centro-Hermitian matrices. A new computationally efficient alternative is presented to the Levinson recurrence on either the Hermitian or skew-Hermitian polynomial spaces. This approach also leads to an entirely n... 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