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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 4 • Date April 1987

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Displaying Results 1 - 25 of 32
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (201 KB)
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1987, Page(s): c4
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    Freely Available from IEEE
  • Experimentation with synthesized speech generated from line-spectrum pairs

    Publication Year: 1987, Page(s):568 - 571
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Line-spectrum pairs (LSP's) are frequency-domain parameters similar to formant frequencies. Thus, they have frequency-selective spectral-error characteristics which allow LSP quantization in accordance with auditory perception. In addition, ease of estimating the spectral-error sensitivity of each line spectrum makes possible encoding each line spectrum efficiently. This correspondence, for the fi... View full abstract»

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  • On optimal image digitization

    Publication Year: 1987, Page(s):553 - 555
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Nielsen et al. recently addressed the problem of determining the optimal discretization grid and quantization depth when a given bivariate function f(x, y) has to be described with a predetermined number of bits. This was done under the assumption that the function value range and mean "fluctuation rates" in the x and y direction are given, and that ideal point sampling with zero-order-hold interp... View full abstract»

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  • A framework for beamforming structures

    Publication Year: 1987, Page(s):584 - 586
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A framework for describing linearly constrained minimum variance (LCMV) beamforming structures is presented. The framework results from factoring the processor impulse response into a weight vector and a matrix which describes the structure. Classes of structures with equivalent steady-state and adaptive performance are discussed. Examples are given which illustrate application of this framework t... View full abstract»

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  • A new realization fo 2-D digital filters

    Publication Year: 1987, Page(s):533 - 542
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A systolic array realization for 2-D digital filters is presented. It is based on Chan's local state-space model. This structure has the minimum number of states (minimum delays). A technique is also presented to reduce the number of multipliers to its minimum. Conditions that the system eigenvalues have to satisfy to ensure low sensitivity with respect to the variations in the multipliers are dev... View full abstract»

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  • A technique for using multipulse linear predictive speech synthesis in text-to-speech type systems

    Publication Year: 1987, Page(s):586 - 587
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A scheme for alteration of pitch and timing in multipulse linear predictive synthesized speech is presented. The method is a hybrid of waveform coding and linear prediction. It attempts to combine the high-quality sound units available in waveform techniques with the ability to alter prosody available from linear prediction. View full abstract»

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  • Modular architectures for adaptive multichannel lattice algorithms

    Publication Year: 1987, Page(s):543 - 552
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    A modular architecture for adaptive multichannel lattice algorithms is presented. This architecture requires no matrix computations and has a regular structure, which significantly simplifies its implementation as compared to the multichannel (matrix) version of the same algorithms. Because the suggested architecture exhibits a high degree of parallelism and local communication, it is well suited ... View full abstract»

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  • Simplifications in multidimensional stability margin computations

    Publication Year: 1987, Page(s):566 - 568
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Previously published algorithms for the computation of multidimensional stability margins of discrete systems require a stability test of these systems before starting the computational algorithm. In this correspondence, it is shown that the multidimensional stability test may be replaced by single-dimensional tests for one kind of stability margin, and can be omitted completely for the second kin... View full abstract»

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  • A new technique for adaptive frequency estimation and tracking

    Publication Year: 1987, Page(s):561 - 564
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A new technique is presented for estimating the frequency of a sinusoid in noise. Standard techniques typically estimate the frequency of a sinusoid from an estimate of the autocorrelation function or from a filter model. These techniques require a large number of samples for an accurate estimate of the frequency. Furthermore, if the frequency is varying with time, recomputation of the autocorrela... View full abstract»

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  • Resolution of signal wavefronts by eigenvector rotation

    Publication Year: 1987, Page(s):564 - 566
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    It is demonstrated that signal wavefronts may be resolved by eigenvector rotation. This technique relies on the source eigenvectors rather than the noise eigenvectors. It is shown that the technique is easy to perform numerically and that the resolution is superior to that obtained from the MUSIC algorithm. View full abstract»

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  • Streaking in median filtered images

    Publication Year: 1987, Page(s):493 - 503
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1512 KB)

    This paper presents a probabilistic analysis of the streaking or blotching effect commonly observed in median filtered signals in both one and two dimensions. The effcts are identified as runs of equal or nearly equal values which create visual impressions that have no visual correlate. For one-dimensional discrete iid random signals with continuous input probability densities, the probability of ... View full abstract»

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  • Direct phase retrieval

    Publication Year: 1987, Page(s):520 - 526
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    A direct, noniterative approach to retrieving a multidimensional complex image (i.e., its phase can vary from pixel to pixel) from the magnitude of its Fourier transform is developed. The uniqueness of the reconstruction is shown to be a direct consequence of the existence of zero surfaces or sheets in the multidimensional z transforms of the image. The analytic properties of these zero sheets ena... View full abstract»

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  • On the probability density of a maximum likelihood mean frequency estimator

    Publication Year: 1987, Page(s):579 - 580
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A simplified derivation of the probability density function of a mean frequency estimator that equates the mean to the location of the peak of the discrete power spectrum is presented. Although the model in which the signal straddles at most two spectral coefficients is emphasized, the general case of arbitrary signal leakage is also worked out in detail. Previous work on this topic implies that n... View full abstract»

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  • Arbitrarily high sampling rate adaptive filters

    Publication Year: 1987, Page(s):455 - 470
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    Adaptive filters have an inherent feedback from error signal back to the adaptation of the coefficients. This represents a problem in high sampling rate realizations. We demonstrate a realization of adaptive filters for which there is no theoretical limit on sampling rate in a given speed of hardware, at the expense of additional hardware and latency. Our realization does not change the input-outp... View full abstract»

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  • A new direct algorithm for image reconstruction from Fourier transform magnitude

    Publication Year: 1987, Page(s):511 - 519
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    In this paper we present a new direct solution to the problem of reconstructing a two-dimensional discrete signal of finite support from knowledge of only its Fourier transform magnitude and support. Using the autocorrelation function of the unknown signal, zeros are calculated of a polynomial whose coefficients correspond to the unknown image or the image reversed. From these zeros, a set of line... View full abstract»

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  • Hardware for image rotation by twice skew transformations

    Publication Year: 1987, Page(s):527 - 532
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Image processing systems in real time are going to be used in various fields, in both factories and offices. However, these performances are not sufficient when a very short processing time is required. This paper presents quite a new method of high-speed image rotation. Here an image is rotated only by twice skew transformations, whereby each pixel is shifted in parallel with each coordinate axis... View full abstract»

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  • Extensions of the stability criterion for ARMA filters

    Publication Year: 1987, Page(s):425 - 432
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Using the lattice representation of an ARMA filter, it is well known that the necessary and sufficient condition so that the poles are inside the unit circle is |k_{i} < 1, 1 \leq i \leq n where the ki's are the reflection coefficients. The filter is said to be wide sense stable if no pole is located outside the unit circle, and it is interesting ... View full abstract»

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  • On the rate of growth of condition numbers for convolution matrices

    Publication Year: 1987, Page(s):471 - 475
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    When analyzing linear systems of equations, the most important indicator of potential instability is the condition number of the matrix. For a convolution matrix W formed from a series w (where W_{ij} = w_{i-j+1}, 1 \leq i-j + 1 \leq k, W_{ij} = 0 otherwise), this condition number defines the stability of the deconvolution process. For the larger convolution... View full abstract»

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  • Confidence intervals for the maximum entropy spectrum

    Publication Year: 1987, Page(s):504 - 510
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    We present a computationally efficient method of calculating confidence intervals for the maximum entropy (ME) or autoregressive (AR) spectrum, based on new theoretical considerations. The method is consistent with the well-known asymptotic results, and it can be incorporated under certain assumptions into the Levinson-Durbin recursion. The method is also extended to ME wavenumber estimation. View full abstract»

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  • A Bayesian-adaptive decision method for the V/UV/S classification of segments of a speech signal

    Publication Year: 1987, Page(s):556 - 559
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In this correspondence, a method for voiced (V), unvoiced (UV), or silence (S) classification of speech segments, based on the maximum a posteriori probability criterion, is presented. The a posteriori probabilities of the three classes are determined using a vector x = ( f1,... , fL) of measurements on the segment under consideration. It is assumed that the vector x has an L... View full abstract»

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  • Convergence improvement in the adaptive implementation of Pisarenko's method

    Publication Year: 1987, Page(s):574 - 577
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The problems of the initialization and of the choice of the adjusting step in the adaptive implementation of Pisarenko's method have been overcome by two techniques recently proposed in the technical literature. In the present correspondence, the relation between them is investigated in detail. Moreover, some suggestions are given for improving their convergence and for reducing their computationa... View full abstract»

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  • On the approximate factorization of 2-D polynomials

    Publication Year: 1987, Page(s):577 - 579
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A method is presented for the approximate factorization of unfactorable bivariate polynomials. An efficient iterative algorithm is developed to minimize an appropriate criterion. The basic ideas can be easily extended to the case of polynomials in more than two independent variables. An example is presented to illustrate the utility of the method. View full abstract»

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  • On a fundamental property of the Wigner distribution

    Publication Year: 1987, Page(s):559 - 561
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    We discuss and illustrate the following fundamental property of the Wigner distribution: the Wigner distribution is not necessarily zero when the signal is zero. View full abstract»

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  • Closed-loop least mean square time-delay estimator

    Publication Year: 1987, Page(s):413 - 424
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    An LMS closed-loop time-delay estimator is presented. It uses the error between two samples of the incoming signal (the difference between the delayed signal and the reference signal passed through a known delay) as a performance index for the estimator. The LMS algorithm adaptively controls the delay so as to minimize the mean square of this error. The controlled delay is implemented using surfac... 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