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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 1 • Date Jan. 1988

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Displaying Results 1 - 21 of 21
  • Maximum likelihood estimation of the parameters of a plane wave tone at an equispaced linear array

    Publication Year: 1988, Page(s):128 - 130
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    Maximum likelihood estimation of the amplitude, phase, frequency, and arrival angle of a plane wave tone at an M-element linear array using equispaced discrete-time observations is considered. The estimator is obtained for the case when the signal amplitude at each element is equal and is extended to the case of arbitrary amplitudes. The Cramer-Rao bounds are obtained for both cases and a Monte Ca... View full abstract»

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  • Some improvements on the synchronized-overlap-add method of time scale modification for use in real-time speech compression and noise filtering

    Publication Year: 1988, Page(s):139 - 140
    Cited by:  Papers (4)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The synchronized-overlap-add (SOLA) method of time-scale modification has proven to be a useful technique for speech compression, both alone and when cascaded with other methods. The authors present a modification of the method which, while costing approximately 3% in compression ratio, increases the computation speed of the method by 30% and results in much higher quality transmission. They also ... View full abstract»

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  • Transit-time estimation in turbulent flows

    Publication Year: 1988, Page(s):20 - 28
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The transit-time estimation problem in a two-sensor arrangement for noncontact flow measurement is considered. In a two-phase flow, due to turbulent motion and flow profile, the transit times of individual particles between the two sensors are not identical. Based on a macroscopic description of the turbulent effects, a process model is developed. An estimator for the mean transit time, i.e. the m... View full abstract»

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  • On the asymptotic distribution of exponentially weighted prediction error estimators

    Publication Year: 1988, Page(s):136 - 139
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors establish the distribution of the exponentially weighted prediction error estimators for a class of general (possibly nonlinear) discrete-time systems. An explicit formula for the covariance matrix of the estimation errors is provided. The distributional results presented hold for a large number N of data points and a weighting (or forgetting) factor λ close to one View full abstract»

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  • Effects of amplitude and phase errors on linear predictive array processors

    Publication Year: 1988, Page(s):10 - 19
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    The effects of amplitude and phase errors are determined for symmetric and asymmetric linear predictive array processors. The maximum entropy method (MEM) corresponds to linear prediction in the asymmetric case of a line array of equispaced elements with an end reference. A comparison to conventional beamforming and maximum-likelihood processing shows that they have the same peak location as the s... View full abstract»

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  • Harmonic retrieval of analog signals

    Publication Year: 1988, Page(s):134 - 136
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A harmonic retrieval algorithm, analogous to that of V. Pisarenko (1973), is derived for extracting harmonics from analog data. The analog hardware required consists of integrators and power meters. The power meter outputs are sampled and a Hankel matrix is formed from these quantities. A minimum matrix pencil problem involving this Hankel matrix is then solved to extract the frequency estimates a... View full abstract»

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  • An adaptive two stage Kalman structure for passive undersea tracking

    Publication Year: 1988, Page(s):3 - 9
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A structure has been developed for tracking maneuvering undersea targets when the observations are passive. Inherent in this problem is the ability to smooth the original measurements before the highly nonlinear transformations to range, so that the range estimate will be less biased. Unlike other tracking techniques, the approach offered is to break up the problem into two stages, before and afte... View full abstract»

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  • Estimation of the power distribution function

    Publication Year: 1988, Page(s):132 - 134
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The authors present two estimators for the power spectral distribution (PSD) function associated with a time series. Although both of them are based on a fast Fourier transform, they converge, with probability=1, the true PSD, and they are consistent under the appropriate hypotheses. Monte Carlo simulations confirm the result that the variance of the proposed estimates depends on the inverse of th... View full abstract»

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  • Maximum likelihood estimation of magnitude-squared coherence

    Publication Year: 1988, Page(s):130 - 132
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A maximum-likelihood estimator (MLE) for coherence is derived. The MLE should be unbiased, and there should be no unbiased estimator with smaller variance. An approximation to the MLE, valid for coherence estimates with a large number of degrees of freedom (DOF), is also derived. The two MLE algorithms and two estimators discussed in earlier literature are compared in a simulation consisting of 81... View full abstract»

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  • Frequency estimation by principal component AR spectral estimation method without eigendecomposition

    Publication Year: 1988, Page(s):95 - 101
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An eigenvalue filtering method is proposed that applies a transformation to an autocorrelation matrix, which has the effect of truncating the undesired eigenvalues so that the corresponding matrix function closely approximates the pseudoinverse. It is shown using a computer simulation that compared to the forward-backward method, the proposed method enhances the threshold in SNR by about 6-8 dB. F... View full abstract»

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  • A frequency-weighted Itakura spectral distortion measure and its application to speech recognition in noise

    Publication Year: 1988, Page(s):41 - 48
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The authors propose an adaptively weighted Itakura distortion measure. They studied its effects on the performance of a conventional dynamic time-warping (DTW)-based speech recognizer in a series of speaker-independent, isolated-digit-recognition experiments. The equivalent SNR improvement achieved by using the proposed weighted Itakura distortion at low SNRs is about 5-7 dB View full abstract»

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  • Rank order operators and the mean absolute error criterion

    Publication Year: 1988, Page(s):63 - 76
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1164 KB)

    The author shows that among all randomizing stack filters whose output decisions are based on the sum of the bits in the window on each level of the threshold decomposition architecture, rank-order operators are optimal under an error criterion which is the sum of the absolute error incurred on each level of the threshold decomposition architecture. He also shows that if the filtering class being ... View full abstract»

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  • Lattice structures for optimal design and robust implementation of two-channel perfect-reconstruction QMF banks

    Publication Year: 1988, Page(s):81 - 94
    Cited by:  Papers (160)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB)

    A lattice structure and an algorithm are presented for the design of two-channel QMF (quadrature mirror filter) banks, satisfying a sufficient condition for perfect reconstruction. The structure inherently has the perfect-reconstruction property, while the algorithm ensures a good stopband attenuation for each of the analysis filters. Implementations of such lattice structures are robust in the se... View full abstract»

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  • 2-D Wilson spectral factorization

    Publication Year: 1988, Page(s):125 - 128
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    G. Wilson's method of spectral factorization (1969) is considered for generalization to the two-dimensional (2-D) case. For practical implementation, finite-order approximants to the 2-D spectral factors of infinite order are obtained. Although stability or convergence cannot be guaranteed in general, justifications are given for the success of the proposed generalization. Illustrative examples ar... View full abstract»

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  • Band-limited interpolation from unevenly spaced sampled data

    Publication Year: 1988, Page(s):110 - 122
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    The author addresses the problem of reconstructing a bandlimited signal from a finite number of its unevenly spaced sampled data. A Fourier analysis of the available unevenly spaced sampled data is presented. The result is utilized to develop an interpolation scheme from the available data. Conditions for accurate reconstruction are examined. Algorithms to implement the reconstruction scheme are d... View full abstract»

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  • A new statistical approach for the automatic segmentation of continuous speech signals

    Publication Year: 1988, Page(s):29 - 40
    Cited by:  Papers (105)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A statistical approach for the segmentation of a continuous speech signal to detect acoustic events is presented. Experiments are carried out to test the segmentation algorithms. Reasonable results are obtained with speech signals, although these are not exactly piecewise stationary. A comparison between the experimental results of automatic and handmade segmentations, demonstrates the potential a... View full abstract»

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  • Taylor series approximation of the energy spectral density

    Publication Year: 1988, Page(s):102 - 105
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A novel method is presented for approximating the energy spectral density (ESD) of discrete data sequences over a limited frequency range. The method uses a truncated Taylor series expanded about one frequency, and is faster than FFT (fast Fourier transform) interpolation. The approximation error is analytically bounded, using the remainder theorem. As an example application, the procedure is used... View full abstract»

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  • Signal enhancement-a composite property mapping algorithm

    Publication Year: 1988, Page(s):49 - 62
    Cited by:  Papers (275)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    A signal enhancement algorithm is developed that seeks to recover a signal from noise-contaminated distorted measurements made on that signal. This object is achieved by utilizing a set of properties which the signal is known or is hypothesized as possessing. The measured signal is modified to the smallest degree necessary to sequentially possess each of the individual properties. Conditions for t... View full abstract»

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  • A simple algorithm for arbitrary polynomial transformation

    Publication Year: 1988, Page(s):77 - 80
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A very simple algorithm is developed for the arbitrary rational transformation of a polynomial. The fact that many of the multiplications performed involve one zero factor is not explicitly taken into account. If desired, this could be done, with some increase in the complexity of the algorithm itself. Finally, if roundoff error is expected to be a problem, double precision arithmetic could be use... View full abstract»

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  • Satisfying the Haar condition in halfband FIR filter design

    Publication Year: 1988, Page(s):123 - 124
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    A reformulation of the FIR symmetric halfband filter design problem is described that allows elimination of the constraints on coefficients from the design, thereby facilitating the direct use of the Parks-McClellan design procedure. In this procedure, it is only necessary to use a single-frequency care-band for approximation with about one-half the filter order of the halfband filter View full abstract»

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  • An iterative method for the identification of MA systems

    Publication Year: 1988, Page(s):106 - 109
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    An iterative method for the identification of an nth-order moving average (MA) system is proposed which is based on a matrix splitting. Because of the special structures of the matrices involved, only O(n) storage is needed. One iteration is accomplished in O(n2) operations, and the algorithm may be executed on a pipeline multiprocessor. Few ... 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