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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 1 • February 1984

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1984, Page(s): 0
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    Freely Available from IEEE
  • Which is the better entropy expression for speech processing: -S log S or log S?

    Publication Year: 1984, Page(s):129 - 137
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    In maximum entropy spectral analysis (MESA), one maximizes the integral oflogS(f), where S(f) is a power spectrum. The resulting spectral estimate, which is equivalent to that obtained by linear prediction and other methods, is popular in speech processing applications. An alternative expression,-S(f)logS(f), is used in optical processing and elsewhere. This paper considers w... View full abstract»

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  • Alpha-trimmed means and their relationship to median filters

    Publication Year: 1984, Page(s):145 - 153
    Cited by:  Papers (209)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (903 KB)

    Suppose that X is a finite set of N numbers, The α-trimmed mean of X is obtained by sorting X into ascending order, removing (trimming) a fixed fractionalpha(0 leq alpha leq 0.5)from the high and low ends of the sorted set, and computing the average of the remaining values. When applied to a sliding window of length LW, the α-trimming process is called α-trim filtering. F... View full abstract»

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  • Correction to "The 'unity-lagged' short-time spectrum of a narrow-band Gaussian process" ¡

    Publication Year: 1984, Page(s): 189
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1984, Page(s): c4
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    Freely Available from IEEE
  • A roundoff error analysis of the LMS adaptive algorithm

    Publication Year: 1984, Page(s):34 - 41
    Cited by:  Papers (145)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The steady state output error of the least mean square (LMS) adaptive algorithm due to the finite precision arithmetic of a digital processor is analyzed. It is found to consist of three terms: 1) the error due to the input data quantization, 2) the error due to the rounding of the arithmetic operations in calculating the filter's output, and 3) the error due to the deviation of the filter's coeff... View full abstract»

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  • Optimal choice of intermediate latching to maximize throughput in VLSI circuits

    Publication Year: 1984, Page(s):28 - 33
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    In many computational tasks, especially in signal processing, it is the throughput that is important, rather than the latency, or delay. If a special-purpose VLSI chip is designed for a particular signal processing task, such as FIR filtering, for example, the maximum clock rate, and hence throughput, is determined by the depth of the combinational logic between registers and the time required for... View full abstract»

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  • Delay estimation by expected value

    Publication Year: 1984, Page(s):19 - 27
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The estimation of time delay between narrowband signals is discussed. A minimum mean square error (MMSE) estimator is used that utilizes the maximum likelihood (ML) window derived by Knapp and Carter in obtaining the required conditional probability density function from which the delay estimate is calculated. The results of simulations using a narrowband signal are presented which evaluate and co... View full abstract»

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  • Iterative nonparametric spectrum estimation

    Publication Year: 1984, Page(s):59 - 69
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    Starting with the traditional spectrum estimation technique, a new iterative nonparametric algorithm is developed. In each iteration of the algorithm, the effect of the previous spectral estimate is removed from the original signal by inverse filtering by a minimum-phase impulse response to obtain a residual signal whose spectral characteristics are then estimated to improve the previous estimate.... View full abstract»

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  • On the optimum tapered burg algorithm

    Publication Year: 1984, Page(s):185 - 186
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Kaveh and Lippert's recently published optimum window technique is reexamined from a frequency-domain viewpoint. It is shown that the overall variance of the error in the frequency estimator is dominated by contributions from those frequency regions near 0 and π where the error model itself is unreliable. Excluding these regions from the variance calculations reveals that the optimum window m... View full abstract»

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  • A generalized window approach to spectral estimation

    Publication Year: 1984, Page(s):7 - 19
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    An approach to spectral estimation is developed. The estimator is constructed from only two starting requirements: closeness to an original autocorrelation estimate and planarity, i.e., smoothness, of the corresponding spectral estimator. The inverse of the variance of the original autocorrelation estimate enters as a weight. By making various a priori assumptions about the variance, and by select... View full abstract»

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  • The structure and performance of estimators for real-time estimation of randomly varying time delay

    Publication Year: 1984, Page(s):81 - 94
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    Structures for time-delay estimation are described which are deduced using the maximum likelihood technique. The performance of estimators, designed for time-invariant delays, is discussed for the case of signals with a time-variable delay. A two-step algorithm for the estimation of a randomly varying time delay between two stochastic signals is developed. In the first step, the maximum likelihood... View full abstract»

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  • A two-parameter family of weights for nonrecursive digital filters and antennas

    Publication Year: 1984, Page(s):108 - 118
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    We derive analytically a two-parameter family of weights for use in finite duration nonrecursive digital filters and in finite aperture antennas. This family of weights is based on the Gegenbauer orthogonal polynomials, which are a generalization of both Legendre and Chebyshev polynomials. It is shown that one parameter controls the main lobewidth and the other parameter controls the sidelobe tape... View full abstract»

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  • Digital communications

    Publication Year: 1984, Page(s): 190
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    First Page of the Article
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  • Estimating acoustic attenuation from reflected ultrasound signals: Comparison of spectral-shift and spectral-difference approaches

    Publication Year: 1984, Page(s):1 - 6
    Cited by:  Papers (59)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    The acoustic attenuation coefficient of soft biological tissue has been observed to have an increasing linear-with-frequency attenuation characteristic with a slope, denoted by β, that varies with the disease condition of the liver. Hence, it would be diagnostically useful to estimate the value of β from reflected ultrasound signals. Two approaches for estimating β are examined: the... View full abstract»

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  • A coefficient fabrication error model for sampled data filters

    Publication Year: 1984, Page(s):70 - 80
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    A coefficient fabrication error model is derived for sampled data filters that requires the first two moments of the random perturbed filter coefficients as inputs. Two examples of model usage are given for an electrooptical processor (EOP) implementation of a finite impulse response (FIR) filter. Both types of EOP coefficient fabrication errors (mask aperture misalignment and mask aperture dimens... View full abstract»

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  • Image display techniques using the cosine transform

    Publication Year: 1984, Page(s):173 - 177
    Cited by:  Papers (18)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Transform coding has the ability to rapidly display a picture of low resolution by inverse transformation of a few of the low sequency coefficients only. Picture resolution is then progressively built up as more coefficients are received and decoded. In this paper, different sequences of transmitting the coefficients are investigated to find one which achieves the best subjective quality with the ... View full abstract»

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  • Stochastic convergence properties of the adaptive gradient lattice

    Publication Year: 1984, Page(s):102 - 107
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A stochastic fixed-point theorem is used as a basis for the study of stochastic convergence properties (in mean-squares sense) of the adaptive gradient lattice filter. Such properties include conditions on the stepsize in the adaptive algorithm and analytic expressions for the misadjustment and convergence rate. Our results indicate that the limits on the stepsize are stricter than the ones obtain... View full abstract»

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  • Mechanical filters in electronics

    Publication Year: 1984, Page(s): 191
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    First Page of the Article
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  • An extended FFT algorithm for ARMA spectral estimation

    Publication Year: 1984, Page(s):168 - 170
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The conventional FFT algorithm can be used for the computation of ARMA spectral estimates, but a large number of operations would involve zeros. An extended fast Fourier transform algorithm which entirely eliminates or greatly reduces such operations is introduced in this paper. Subsequently, the derived algorithm has been applied to ARMA spectral estimation and its effectiveness compared to other... View full abstract»

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  • An improved LPC algorithm for voiced-speech synthesis

    Publication Year: 1984, Page(s):180 - 183
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Current LPC synthesizers have a problem when the driving function is periodic; an output synthesized from LPC analysis has spectral properties which are not identical to those of the analyzed input. These distortions prevent a vocoder from being truly transparent for many voiced sounds. An iterative method, which modifies the conventional LPC coefficients such that the autocorrelation function of ... View full abstract»

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  • An improved maximum likelihood method for power spectral density estimation

    Publication Year: 1984, Page(s):170 - 173
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    In this paper, we present a new procedure for spectral analysis; it represents a tradeoff between the high resolution provided by the maximum entropy method (MEM) and the low sidelobe characteristic of the maximum likelihood method (MLM). The approach that we follow is to introduce a slight modification of the second technique to obtain from the ML filter the true spectral density, not the power l... View full abstract»

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  • Accurate depth determination in well logging

    Publication Year: 1984, Page(s):42 - 48
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    In well logging, where a measuring instrument or "tool" is suspended from a cable in a well bore, accurate information on the instantaneous depth of file tool is difficult to obtain because the tool tends to bounce up and down as the cable is drawn up the borehole. A particularly difficult situation is "stick and slip," i.e., where the sonde stops momentarily, and then jumps forward as cable tensi... View full abstract»

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  • Statistical analysis of Pisarenko's method for sinusoidal frequency estimation

    Publication Year: 1984, Page(s):95 - 101
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    Statistical analysis is performed for Pisarenko's method of sinusoidal frequency estimation by using the periodogram technique. Under the assumption that the data consist of several sinusoids plus white noise, we give an asymptotic expression of the error variance of the sinusoidal frequency estimator. Also, a modified method is proposed. This is computationally efficient but the statistical prope... View full abstract»

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  • A distributed arithmetic MFIR filter

    Publication Year: 1984, Page(s):186 - 189
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The design of high-order FIR filters is considered in the context of speed and complexity. It is shown that by using the multiplicative form of the FIR and the distributed filter architecture, high-order high-speed filters can be designed which have significantly reduced hardware and circuit board requirements. 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