By Topic

IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 12 • December 1987

Filter Results

Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (189 KB)
    Freely Available from IEEE
  • Comments on "Two-dimensional interpolation by generalized spline filters based on partial differential equation image models"

    Publication Year: 1987, Page(s):1778 - 1779
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The generalized spline formula corresponding to the separable semicausal Partial Differential Equation (PDE) image model is given in its correct form. In addition, the correct formula for the second-order B-spline is derived. Finally, it is shown that there is no reason to consider separable PDE image models only, at least when describing the concept of generalized splines. View full abstract»

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

    Publication Year: 1987, Page(s):1779 - 1781
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1987, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (3195 KB)
    Freely Available from IEEE
  • Relationships involving third moments and bispectra of a harmonic process

    Publication Year: 1987, Page(s):1725 - 1726
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Relationships between third moments of a harmonic random process and its bispectrum are presented. The skewness and asymmetry (with respect to a vertical axis) of the process and its derivative can be obtained by integrating the real, imaginary, and frequency-scaled real and imaginary parts of the bispectrum, respectively. Triads of Fourier coefficients containing a high-frequency component can co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Closed-form least-squares source location estimation from range-difference measurements

    Publication Year: 1987, Page(s):1661 - 1669
    Cited by:  Papers (352)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Three noniterative techniques are presented for localizing a single source given a set of noisy range-difference measurements. The localization formulas are derived from linear least-squares "equation error" minimization, and in one case the maximum likelihood bearing estimate is approached. Geometric interpretations of the equation error norms minimized by the three methods are given, and the sta... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Underwater acoustic model-based signal processing

    Publication Year: 1987, Page(s):1670 - 1683
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    An underwater acoustic model-based Signal processing algorithm is presented. Its performance was evaluated via computer simulation of various test cases and compared to that predicted by theory. The model-based algorithm, which is used in conjunction with an FFT beamformer for planar arrays, computes phase weights that correct for deterministic, ocean medium, phase effects due to ray bending as a ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multirate subband coding applied to digital speech interpolation

    Publication Year: 1987, Page(s):1684 - 1698
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1672 KB)

    It has been shown that the output of a multirate subband coder has an embedded bit stream, i.e., accepts bit deletion and insertion for dynamic rate conversion. This property is of great importance in a digital voice communication network since it allows any overloaded node to simply flag and drop appropriate bits from the bit stream, without tandeming of encode/decode operations. This paper prese... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two-dimensional block Kalman filtering for image restoration

    Publication Year: 1987, Page(s):1736 - 1749
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1752 KB)

    This paper is concerned with developing an efficient two-dimensional (2-D) block Kalman filtering for digital image restoration. A new 2-D multiinput, multioutput (MIMO) state-space structure for modeling the image generation process is introduced. This structure is derived by arranging a vector autoregressive (AR) model with a causal quarter-plane region of support in block form. This model takes... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A fixed-point implementation of the unnormalized least-squares lattice using scaled-integer arithmetic

    Publication Year: 1987, Page(s):1781 - 1782
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The unnormalized least-squares lattice algorithm is modified for fixed-point hardware by appropriate scaling of the cross-correlation, covariance, and likelihood parameters. The scaling reveals the dependence of the unnormalized parameter magnitudes on the number of error signal observations used in their respective updates. Comparing fixed-point and floating-point simulations shows no significant... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computationally lag-invariant recursive spectrum estimators

    Publication Year: 1987, Page(s):1713 - 1724
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    This paper is concerned with Fourier-based nonparametric spectral estimation methods for time-varying environments. It presents a class of interactive spectrum estimators in which the number of computations required to update the estimate at every data sample is independent of the number of the autocorrelation lags employed to produce this estimate. These estimators are termed lag invariant and fo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • FFT pruning applied to time domain interpolation and peak localization

    Publication Year: 1987, Page(s):1776 - 1778
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The efficiency of the fast Fourier transform may be increased by removing operations on input values which are zero, and on output values which are not required. This is applied to interpolation of complex and real valued time domain functions. For real functions, analytic signal concepts may be used to get the Hilbert transform as a byproduct, and applied to the cross correlation function this gi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An adaptive Kalman equalizer: Structure and performance

    Publication Year: 1987, Page(s):1727 - 1735
    Cited by:  Papers (28)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    The development of an adaptive infinite impulse response (IIR) linear equalizer is described. Using discrete time Wiener filtering theory, a closed form for the optimum mean-square error IIR filter is derived. A performance comparison using both minimum and non-minimum phase channels indicates the complexity/performance advantages inherent in the IIR system compared to an optimum finite impulse re... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Architectures for multiplierless fast Fourier transform hardware implementation in VLSI

    Publication Year: 1987, Page(s):1750 - 1760
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    This paper presents a novel processor for the implementation of multiplierless FFT's in VLSI. The arithmetic scheme is specially tailored for the simple binary coefficients used for these FFT's, which make multiplication trivial. (The class of coefficients dealt with are those that have a maximum of 2 nonzero digits; i.e., sum of 2 integers powers of 2 with each power in the range 0-4.) A single c... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new approach to signal registration with the emphasis on variable time delay estimation

    Publication Year: 1987, Page(s):1649 - 1660
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Signal registration is concerned with the problem of estimating a varying displacement between two random processes. We approach signal registration here as a recursive demodulation problem in which the recursion is between signal estimations and displacement estimation. Special attention is given to the problem of estimating a variable time delay. Thus, we present new algorithms for estimating D(... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new architecture for digital time domain beamforming

    Publication Year: 1987, Page(s):1761 - 1773
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1384 KB)

    This paper introduces a new approach to an architecture for digital time domain beamforming. The approach is unique as it produces sufficient beams to cover the observation space both simultaneously and continuously. Two implementation techniques are discussed; the first is a single chip beamformer based on a multibus architecture; the second is a multichip network-based architecture. The upper co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some analysis of microphone arrays for speech data acquisition

    Publication Year: 1987, Page(s):1699 - 1712
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    Speech data for recognition, talker verification, or recording are typically acquired using a head-mounted or hand-held microphone. These devices can be very inconvenient or provide a poor signal-to-noise ratio. A microphone array has the potential for surmounting both of these problems. Here, results on optimal spacing and gain for practical linear arrays are derived under the assumption that the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Invariance of the magnitude-squared coherence estimate with respect to second-channel statistics

    Publication Year: 1987, Page(s):1774 - 1776
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Properties of the magnitude-squared coherence (MSC) estimate in the presence of spherically symmetric noise are examined from a geometric point of view. Invariance to second-channel statistics is shown and the distribution function of the estimate is derived. A relationship between spherically symmetric and Gaussian sequences is also given. 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