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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 4 • Date 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 (6)
    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
  • Separable-denominator state-space realization of two-dimensional filters using a canonic form

    Publication Year: 1981, Page(s):846 - 853
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    In this paper a procedure is developed for the computation of a state-space realization of a two-dimensional filter. The transfer function of this realization has a separable denominator. The procedure relies on a canonic form for the state-space realization and utilizes a finite sequence of two-dimensional pulse response coefficients (Markov parameters). View full abstract»

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

    Publication Year: 1981, Page(s):854 - 859
    Cited by:  Papers (5)
    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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  • Low roundoff noise and normal realizations of fixed point IIR digital filters

    Publication Year: 1981, Page(s):893 - 903
    Cited by:  Papers (42)
    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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  • The effect of sampling rate on autocorrelation estimation

    Publication Year: 1981, Page(s):859 - 867
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    In power spectral estimation of a continuous band-limited random process, one must usually estimate the continuous autocorrelation function at lags which are multiples of the Nyquist interval. This is done by sampling the random process at the Nyquist rate and basing the autocorrelation lag estimates on these samples. It is shown, however, that to approximately minimize the mean-square error of th... 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 (108)  |  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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  • Symmetry in two-dimensional rectangularly sampled digital filters

    Publication Year: 1981, Page(s):794 - 805
    Cited by:  Papers (14)
    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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  • An in-place, in-order prime factor FFT algorithm

    Publication Year: 1981, Page(s):806 - 817
    Cited by:  Papers (71)  |  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 method of using Simpson's rule in the DFT

    Publication Year: 1981, Page(s):936 - 937
    Cited by:  Papers (1)
    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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  • On the performance of optimum linear phase low-pass FIR digital filters under impulse response coefficient quantization

    Publication Year: 1981, Page(s):928 - 932
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The effects of coefficient quantization on the frequency response of FIR filters realized in direct form are analyzed in [1]. Applying such results to optimal low-pass filters, simple formulas are derived to predict, starting from the specifications on the frequency response, the filter order and the quantization step size which minimize the bit-multiplier product. View full abstract»

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  • The spectral envelope estimation vocoder

    Publication Year: 1981, Page(s):786 - 794
    Cited by:  Papers (52)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1264 KB)

    This paper describes a low bit-rate vocoder designed for improved speech reproduction quality and robustness. The vocoder is designed around a new algorithm, the spectral envelope estimator, which forms the nucleus of the spectral analyzer. In addition to estimating the speech spectrum, the spectral analyzer also allows determination of a continuous estimate of the background noise spectrum, which... View full abstract»

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  • SVD pseudoinversion image reconstruction

    Publication Year: 1981, Page(s):904 - 909
    Cited by:  Papers (34)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    The singular value decomposition (SVD) pseudoinversion method has been applied to image reconstruction from projections. In this paper, two SVD pseudoinversion methods are discussed in the search for optimum restoration; one uses Wiener filtering and the other uses truncated inverse filtering. These methods partly overcome the ill-conditioned nature of reconstruction problems by trading off betwee... 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 (8)
    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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  • Intersection filters for general decimation/Interpolation

    Publication Year: 1981, Page(s):934 - 936
    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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  • A modified version of Van-Cittert's iterative deconvolution procedure

    Publication Year: 1981, Page(s):938 - 939
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    It is well known that the iterative procedure of deconvolution proposed by Van-Cittert does not converge in every case. This correspondence gives a modified version of this method which converges for a broader class of distortions and removes some artifacts introduced by the original algorithm. 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 (21)
    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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  • An approximation to the cumulative distribution function of the magnitude-squared coherence estimate

    Publication Year: 1981, Page(s):932 - 934
    Cited by:  Papers (3)
    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 (55)
    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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  • Extrapolation algorithms for discrete signals with application in spectral estimation

    Publication Year: 1981, Page(s):830 - 845
    Cited by:  Papers (114)  |  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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  • Two-dimensional type-preserving circular windows

    Publication Year: 1981, Page(s):926 - 928
    Cited by:  Papers (5)
    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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  • Digital complex envelope demodulation using nonminimal normal form structures

    Publication Year: 1981, Page(s):910 - 912
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Through the use of a complex bandpass digital filter with decimated output, the complex envelope of a narrow-band signal can be obtained by multiplying the decimated filter output by a complex exponential sequence. For appropriate choices of decimation ratio, the complex envelope can be obtained directly from the output of the complex filter, with no multiplications by a complex exponential sequen... 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