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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 6 • December 1986

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Displaying Results 1 - 25 of 42
  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Recursive estimation and time-series analysis

    Publication Year: 1986, Page(s): 1678
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (150 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
  • The relation between maximum likelihood estimation of structured covariance matrices and periodograms

    Publication Year: 1986, Page(s):1661 - 1662
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A generalized Burg technique has been developed recently by Burg, Luenberger, and Wegner for maximum likelihood estimation of structured covariance matrices. In this correspondence, the unique solution for the positive definite estimate over a class of nonnegative definite, symmetric matrices with known eigenvectors is presented. This solution coincides with the Karhunen-Loève expansion, and ... View full abstract»

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  • On the relation between the maximum entropy probability density function and the autoregressive model

    Publication Year: 1986, Page(s):1659 - 1661
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The problem of maximizing the entropy of an n-variate random vector subject to constraints on the first p + 1 autocovariance terms is examined. It is shown that the maximum is achieved by the Gaussian autoregressive process of order p satisfying the autocovariance constraints. This solution provides Burg's theorem about the maximum entropy spectral density as a special case. View full abstract»

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  • Hyperbolic householder transformations

    Publication Year: 1986, Page(s):1589 - 1602
    Cited by:  Papers (83)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1576 KB)

    A class of transformation matrices, analogous to the Householder matrices, is developed, with a nonorthogonal property designed to permit the efficient deletion of data from least-squares problems. These matrices, which we term hyperbolic Householder, are shown to effect deletion, or simultaneous addition and deletion, of data with much less sensitivity to rounding errors than for techniques based... View full abstract»

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  • Sequences with positive semidefinite Fourier transforms

    Publication Year: 1986, Page(s):1502 - 1510
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    A sequence is said to be positive if its Fourier transform exclusively takes on real nonnegative values as a function of frequency. Positive sequences play a prominent role in contemporary signal processing and system theory. To illustrate this point, it is well known that the factorization theorem is extensively used in studies related to wide-sense stationary random signals and linear systems. T... View full abstract»

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  • The computation of line spectral frequencies using Chebyshev polynomials

    Publication Year: 1986, Page(s):1419 - 1426
    Cited by:  Papers (104)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Line spectral frequencies provide an alternate parameterization of the analysis and synthesis filters used in linear predictive coding (LPC) of speech. In this paper, a new method of converting between the direct form predictor coefficients and line spectral frequencies is presented. The system polynomial for the analysis filter is converted to two even-order symmetric polynomial with interlacing ... View full abstract»

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  • A rearranged DFT algorithm requiring N2/6 multiplications

    Publication Year: 1986, Page(s):1658 - 1659
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    We consider the problem of computing the DFT and present two reductions over the standard formula. In the special case of an N-point sequence with N = 2l, the number of multiplications per output point required by this algorithm is, at most, N/4 - 1 and, on the average, N/6 - 1. Each output point requires no more than N - 1 additions. In applications requiring only some of the output po... View full abstract»

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  • Approximate realization algorithms for truncated impulse response data

    Publication Year: 1986, Page(s):1583 - 1588
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The objectives of this paper are: 1) to present a novel derivation of an approximate realization algorithm using singular value decomposition proposed by Kung; 2) to explain the difference between two versions of this algorithm which have been used interchangeably in the literature; and 3) to introduce a new version of this algorithm which exhibits the accuracy of the original algorithm and the th... View full abstract»

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  • An integrated-circuit-based speech recognition system

    Publication Year: 1986, Page(s):1465 - 1472
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    A high-performance, flexible, and potentially inexpensive speech recognition system is described. The system is based on two special-purpose integrated circuits that perform the speech recognition algorithms very efficiently. One of these integrated circuits is the front-end processor, which computes spectral coefficients from incoming speech. The second integrated circuit computes a dynamic-time-... View full abstract»

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  • A Kalman filtering approach to short-time Fourier analysis

    Publication Year: 1986, Page(s):1493 - 1501
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    The problem of estimating time-varying harmonic components of a signal measured in noise is considered. The approach used is via state estimation. Two methods are proposed, one involving pole-placement of a state observer, the other using quadratic optimization techniques. The result is the development of a new class of filters, akin to recursive frequency-sampling filters, for inclusion in a para... View full abstract»

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  • A self-orthogonalizing efficient block adaptive filter

    Publication Year: 1986, Page(s):1573 - 1582
    Cited by:  Papers (12)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    This paper deals with the development of a unique self-orthogonalizing block adaptive filter (SOBAF) algorithm that yields efficient finite impulse response (FIR) adaptive filter structures. Computationally, the SOBAF is shown to be superior to the least mean squares (LMS) algorithm. The consistent convergence performance which it provides lies between that of the LMS and the recursive least squar... View full abstract»

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  • Speech transformations based on a sinusoidal representation

    Publication Year: 1986, Page(s):1449 - 1464
    Cited by:  Papers (51)  |  Patents (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1528 KB)

    In this paper a new speech analysis/synthesis technique is presented which provides the basis for a general class of speech transformations including time-scale modification, frequency scaling, and pitch modification. These modifications can be performed with a time-varying change, permitting continuous adjustment of a speaker's fundamental frequency and rate of articulation. The method is based o... View full abstract»

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  • Bandpass and bandstop recursive filters with low sensitivity

    Publication Year: 1986, Page(s):1485 - 1492
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    In a sharp cutoff bandpass or bandstop recursive digital filter, the poles and zeros are expected to be clustered around the band edges, and in close proximity of the unit circle in the z-plane. Implementation of such filters with low sensitivity could be achieved by cascading second-order sections, with appropriate low sensitivity structures chosen for individual sections depending on the locatio... View full abstract»

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  • An optimal technique for constraint-based image restoration and reconstruction

    Publication Year: 1986, Page(s):1629 - 1642
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1760 KB)

    A new technique for finding an optimal feasible solution to the general image reconstruction and restoration problem is described. This method allows the use of prior knowledge of the properties of both the solution and any noise present on the data. The problem is formulated as the optimization of a cost function over the intersection of a number of convex constraint sets; each set being defined ... View full abstract»

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  • On the complex residue arithmetic system (CRNS)

    Publication Year: 1986, Page(s):1675 - 1677
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Recently, a number of papers has been published on the subject of performing complex arithmetic in the residue number system. Methods have been proposed which reduce the arithmetic complexity of a complex multiply by more than 50 percent. In this correspondence it is shown that these methods achieve Winograd's lower bound, and how these efficient mappings can be derived in terms of polynomial ring... View full abstract»

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  • A comparison of numerator estimators for ARMA spectra

    Publication Year: 1986, Page(s):1668 - 1671
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    This correspondence investigates the problems of estimating the numerator spectrum corresponding to an ARMA time series model once the denominator spectrum (i.e., the AR coefficients) has been estimated. A general form for an estimator of the numerator spectral (NS) coefficients is developed first. Six NS estimators from the recent literature are then compared by fitting them into this general fra... View full abstract»

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  • An unconstrained partitioned realization for derivative constrained broad-band antenna array processors

    Publication Year: 1986, Page(s):1376 - 1379
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    This paper presents an orthogonal decomposition approach for realizing the derivative constrained broad-band processor as an unconstrained partitioned form. The structure presented is similar to the generalized sidelobe canceller (GSC) structure described in the literature. Furthermore, the paper also examines the components of the unconstrained partitioned structure for the first-order case in de... View full abstract»

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  • Zero-tracking adaptive filters

    Publication Year: 1986, Page(s):1566 - 1572
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A new type of adaptive filter is proposed which can directly estimate and track its own zeros. The adaptation algorithm adapts the zeros of the filter and hence, indirectly, the filter coefficients. To first order in the adaptation parameter, the new algorithm is equivalent to the usual LMS algorithm, and thus it shares the same convergence properties with the latter. The cases of adaptive predict... View full abstract»

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  • Bias in the cross spectrum and time delay estimates due to misalignment

    Publication Year: 1986, Page(s):1662 - 1665
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The effect of misalignment in the weighted, overlapped segment averaging method used for estimating time delay is investigated. With nonwhite input, it is shown that the phase of the cross spectrum and the location of the peak in the cross correlator are biased. View full abstract»

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  • Adaptive equalizer using finite-bit power-of-two quantizer

    Publication Year: 1986, Page(s):1603 - 1611
    Cited by:  Papers (27)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    The stochastic gradient algorithm using a simplified arithmetic is analyzed in this paper. A power-of-two quantizer is used for the input of the multiplier to reduce the multiplication to at most a simple shift. In spite of its simple implementation, the performance is shown to be comparable to the classical LMS algorithm. A linearized approximation to the quantizer is first derived, followed by t... View full abstract»

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  • Efficient implementations of quadratic digital filters

    Publication Year: 1986, Page(s):1511 - 1528
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    Efficient implementation structures of quadratic filters are introduced in this paper using systolic arrays, distributed arithmetic, and linear convolutions with multipliers. The implementations are based on matrix decompositions and consist of a set of parallel 1-D FIR filters in cascade with a set of sequential square-in add-out type of operations. The structures are compared using various reali... View full abstract»

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  • Waveform substitution techniques for recovering missing speech segments in packet voice communications

    Publication Year: 1986, Page(s):1440 - 1448
    Cited by:  Papers (79)  |  Patents (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    Packet communication systems cannot, in general, guarantee accurate and prompt delivery of every packet. The effect of network congestion and transmission impairments on data packets is extended delay; in voice communications these problems lead to lost packets. When some speech packets are not available, the simplest response of a receiving terminal is to substitute silence for the missing speech... View full abstract»

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  • On averaging burg spectral estimators for segments

    Publication Year: 1986, Page(s):1473 - 1484
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    The Burg spectral estimator (BSE) exhibits better peak resolution than conventional linear spectral estimators, particularly for short data records. Based on this property, the quality of the BSE is investigated with the available data record segmented and the relevant parameters or functions associated with each segment averaged. Averaging of autoregressive coefficients, reflection coefficients, ... 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