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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 4 • August 1981

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Floating point roundoff error in the prime factor FFT

    Publication Year: 1981, Page(s):877 - 882
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (627 KB)

    The prime factor fast Fourier transform (PF FFT), developed by Kolba and Parks, makes use of recent computational complexity results by Winograd to compute the DFT with a fewer number of multiplications than that required by the FFT. Patterson and McClellan have derived an expression for the mean squared error (MSE) in the PF FFT, assuming finite precision fixed point arithmetic. In this paper, we... View full abstract»

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  • Comment on overflow in two's complement addition

    Publication Year: 1981, Page(s):937 - 938
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    If a total two's complement sum is correct, then the number of true overflows which may have occurred is even. View full abstract»

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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    Freely Available from IEEE
  • Quantization noise analysis of a general digital filter

    Publication Year: 1981, Page(s):883 - 892
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    A new, precise modeling technique is presented for the exact representation of digital filters, discrete systems, or computational algorithms. It leads to a method for the determination of the noise variance of the filter output due to quantization errors occurring at multipliers, summers, and the A/D converter. The noise formulae are in either infinite series or closed form and through their use ... View full abstract»

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  • An in-place, in-order prime factor FFT algorithm

    Publication Year: 1981, Page(s):806 - 817
    Cited by:  Papers (108)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    This paper presents a Fortran program that calculates the discrete Fourier transform using a prime factor algorithm. A very simple indexing scheme is employed that results in a flexible, modular algorithm that efficiently calculates the DFT in-place. A modification of this algorithm gives the output both in-place and in-order at a slight cost in flexibility. A comparison shows it to be faster than... View full abstract»

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  • A delay-lock period estimator

    Publication Year: 1981, Page(s):912 - 914
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    If the derivative of a periodic signal approximated by its first difference, and the difference between the signal and its estimated one period delayed version are correlated, it is possible to find the period using a simple algorithm similar to the quantized delay-lock discriminator. The estimator uses a fixed number of allocations to store samples of the input, taken at a variable rate by a samp... View full abstract»

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  • Some notes on closed phase glottal inverse filtering

    Publication Year: 1981, Page(s):917 - 919
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Berouti et al. [2]-[4] and Wong et al. [5] have reported procedures for the "closed phase" identification of the all-pole model of the vocal tract. These procedures are shown to be equivalent in a certain case. We argue for the superior performance of Wong's method when modeling errors exist. Finally, a modification to Berouti's method is suggested. View full abstract»

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  • Generation of cross-covariance sequences

    Publication Year: 1981, Page(s):922 - 923
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    We propose a linear method for the generation of cross-covariance sequences in multichannel systems described by rational transfer functions. The method relies on the determination of a linear discrete-time filter whose impulse response is the desired cross-covariance sequence. We also prove existence and uniqueness of the solution. View full abstract»

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  • Symmetry in two-dimensional rectangularly sampled digital filters

    Publication Year: 1981, Page(s):794 - 805
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    It is well known that exploiting the quadrantal, diagonal, or octagonal symmetry existing in the 2-D filter frequency response results in a reduction in the design and implementation complexities. This paper introduces new symmetries that could possibly exist in the frequency response. The symmetries are presented in a general framework that encompasses all previously known and newly discovered sy... View full abstract»

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  • Adaptive Gaussian filtering and local frequency estimates using local curvature analysis

    Publication Year: 1981, Page(s):854 - 859
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    This paper presents an adaptive filtering technique for smoothing noisy sampled data. Due to the adaptive nature of the process, distortion of the information content is significantly reduced. Each point of the smoothed output is the result of a central convolution of the noisy data with a Gaussian. Gaussians of different width are used to produce each point of the smoothed output. The width of ea... View full abstract»

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  • The allocation problem in distributed signal processing

    Publication Year: 1981, Page(s):817 - 830
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1592 KB)

    Functional allocation in a distributed signal processor is examined from the point of view of efficient use of system processing resources. An efficient allocation is one that either 1) achieves a smaller overall cycle time for a given processing sequence for the same, or fewer, resources than that of any other, or 2) uses a smaller number of resources than any other to satisfy a maximum allowable... View full abstract»

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  • An approximation to the cumulative distribution function of the magnitude-squared coherence estimate

    Publication Year: 1981, Page(s):932 - 934
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    We investigate a nonlinear distortion that converts the magnitude-squared coherence estimate to a near-Gaussian random variable. In particular, we present simple approximations for the mean and variance of this nonlinearly distorted magnitude-squared coherence estimate and fit a Gaussian cumulative distribution function over a wide range of parameters. View full abstract»

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  • On the eigenvectors of symmetric Toeplitz matrices

    Publication Year: 1981, Page(s):868 - 872
    Cited by:  Papers (88)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    This paper presents a number of results concerning the eigenvectors of a symmetric Toeplitz matrix and the location of the zeros of the filters (eigenfilters) whose coefficients are the elements of the eigenvectors. One of the results is that the eigenfilters corresponding to the maximum and minimum eigenvalues, if distinct, have their zeros on the unit circle, while the zeros of the other eigenfi... View full abstract»

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  • Computational analysis of Mandarin

    Publication Year: 1981, Page(s):941 - 942
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    First Page of the Article
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  • Low roundoff noise and normal realizations of fixed point IIR digital filters

    Publication Year: 1981, Page(s):893 - 903
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    Explicit design and performance equations are given in terms of the parameters of the desired transfer function H(z) for two classes of realizations. These realizations offer the digital circuit designer an alternative to the usual designs based on direct forms. In addition to low roundoff noise, these new realizations offer other desirable properties such as low coefficient sensitivities and free... View full abstract»

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  • Intersection filters for general decimation/Interpolation

    Publication Year: 1981, Page(s):934 - 936
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Optimum multiple stopband FIR filters for decimation or interpolation by integer factors have been presented in the literature. In this correspondence we extend these results to the case of general decimation/interpolation by rational factors. The resulting filters are called intersection filters because their stopbands are intersections of the stopbands required in the case of integer factors. Si... View full abstract»

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  • Model for the power spectral density of quantization noise

    Publication Year: 1981, Page(s):914 - 917
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A model is given for the spectrum of the noise produced by passing a signal through a uniform quantizer. The model requires knowledge only of the amplitude distribution of the derivative of this signal. The model is compared with experimental results for a sinusoidal input signal and the sum of two sinusoids. Conditions are given under which the quantization noise spectrum is white. View full abstract»

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  • Equal observation interval comparison of maximum entropy and weighted overlapped segment averaging spectrum estimation techniques

    Publication Year: 1981, Page(s):919 - 922
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This correspondence presents a brief summary of an experimental comparison between conventional spectral estimation methods and a maximum entropy spectrum analysis (MESA) algorithm. These results should be of some interest to workers in acoustical signal processing, especially sonar and surveillance, due to several factors in the form of the experimentation. Specifically, these factors are the ran... View full abstract»

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  • On approximating an FIR filter using discrete orthonormal exponentials

    Publication Year: 1981, Page(s):923 - 926
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A given causal FIR filter may be approximated by an IIR filter of lower order requiring fewer memory elements. An iterative procedure is given for optimizing the approximation in the discrete time domain, based on representing the IIR function as a sum of orthonormalized complex decaying exponentials. View full abstract»

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  • An improved endpoint detector for isolated word recognition

    Publication Year: 1981, Page(s):777 - 785
    Cited by:  Papers (154)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Accurate location of the endpoints of an isolated word is important for reliable and robust word recognition. The endpoint detection problem is nontrivial for nonstationary backgrounds where artifacts (i.e., nonspeech events) may be introduced by the speaker, the recording environment, and the transmission system. Several techniques for the detection of the endpoints of isolated words recorded ove... View full abstract»

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  • Extrapolation algorithms for discrete signals with application in spectral estimation

    Publication Year: 1981, Page(s):830 - 845
    Cited by:  Papers (164)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1552 KB)

    In this paper we present some new algorithms useful for extrapolation and spectral estimation of band-limited sequences in one and two dimensions. First we show that many of the existing extrapolation algorithms for noiseless observations are unified under the criterion of minimum norm least squares (MNLS) extrapolation. For example, the iterative algorithms proposed in [2] and [8]-[10] are shown ... View full abstract»

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  • Differintegral interpolation from a bandlimited signal's samples

    Publication Year: 1981, Page(s):872 - 877
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The Whittaker-Shannon cardinal series dictates that any L2bandlimited signal is defined everywhere by its (sufficiently closely spaced) sample values. This paper derives those interpolation functions necessary for direct evaluation of such a signal's derivatives, integrals, and fractional derivatives directly from the sample values. Generation and recursion formulas for these interpolat... View full abstract»

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  • A method of using Simpson's rule in the DFT

    Publication Year: 1981, Page(s):936 - 937
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The method of taking a 2N-point DFT by means of an N-point DFT is modified such that Simpson's rule replaces the trapezoidal rule in the approximation to the Fourier integral. The Simpson's rule version is compared to the trapezoidal rule version on the basis of equal upper bounds on truncation error, and it is shown that Simpson's rule has the advantage of requiring a lower sampling rate under th... View full abstract»

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  • Two-dimensional type-preserving circular windows

    Publication Year: 1981, Page(s):926 - 928
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    An approximate method for designing two-dimensional (2-D) windows with circular symmetry was developed. The 2-D window is obtained by rotating the frequency response of a 1-D window in Fourier space followed by the inverse Fourier transform. It has the identical width of the 1-D window, and features of the 1-D window are well preserved. 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