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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 5 • Date May 1989

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Displaying Results 1 - 24 of 24
  • Optimistic and pessimistic approximations to variance of time delay estimators

    Publication Year: 1989, Page(s):634 - 641
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    A general theorem is presented that can be used to find an optimistic or, if preferred, pessimistic expression for the variance of a time delay estimator. The theorem concerns the relative locations of the maxima of two functions which are contaminated with identical additive noise. The utility of the method developed is demonstrated by applying the approach to the generalized cross correlator to ... View full abstract»

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  • Joint optimization of linear predictors in speech

    Publication Year: 1989, Page(s):642 - 650
    Cited by:  Papers (9)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    Formant and pitch predictors which are jointly optimized are discussed. The first configuration considered is a combination prediction error filter (in either a transversal or lattice form) that performs the function of both a formant and a pitch filter. Although a transversal combination filter outperforms the conventional F-P (formant followed by pitch) sequential solution, the combination filte... View full abstract»

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  • Unstable covariance LPC solutions from nonstationary speech waveforms

    Publication Year: 1989, Page(s):651 - 654
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (357 KB)

    Linear Predictive Coding (LPC) analysis of speech is made using a stationary model while parts of speech such as stop consonants are highly nonstationary. An asymptotic analysis is made of the stability of the LPC model obtained from a simplified model of a nonstationary waveform. This model is used to predict the occurrence of unstable LPC models in the analysis of a stop consonant.<> View full abstract»

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  • Algebraic approach to two-dimensional recursive digital filter synthesis

    Publication Year: 1989, Page(s):655 - 664
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    An effective algorithm is developed for synthesizing two-dimensional recursive digital filters which approximate prescribed ideal frequency response specifications. The algorithm is based on an algebraic approach that uses the eigenvalue-eigenvector decomposition of the ideal filter's excitation-response matrix in conjunction with a recently developed signal-enhancement method. This results in a r... View full abstract»

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  • Two-channel perfect-reconstruction FIR QMF structures which yield linear-phase analysis and synthesis filters

    Publication Year: 1989, Page(s):676 - 690
    Cited by:  Papers (190)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1403 KB)

    Two perfect-reconstruction structures for the two-channel quadrature mirror filter (QMF) bank, free of aliasing and distortions of any kind, in which the analysis filters have linear phase, are described. The structure in the first case is related to the linear prediction lattice structure. For the second case, new structures are developed by propagating the perfect-reconstruction and linear-phase... View full abstract»

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  • Ll-filters-a new class of order statistic filters

    Publication Year: 1989, Page(s):691 - 701
    Cited by:  Papers (84)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1025 KB)

    The Ll-filters are introduced to generate the order statistic filters (L-filters) and the nonrecursive linear, or finite-duration impulse-response (FIR), filters. Such estimators are particularly effective filtering signals that do not necessarily follow Gaussian distributions. They can be designed to restore one-dimensional or multidimensional signals corrupted by noise of impulsive type. Such fi... View full abstract»

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  • Identification of nonstationary models with application to myoelectric signals for controlling electrical stimulation of paraplegics

    Publication Year: 1989, Page(s):713 - 719
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    It has been shown that the estimates of the nonstationary identifier proposed by A. Kitagawa and W. Gersch (1985) do indeed exist for all inputs because the formation is uniformly observable with probability one, and that the identifier is stable because the formulation is uniformly controllable. Some of the complicating factors concerning their nonstationary identification algorithm are clarified... View full abstract»

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  • MUSIC, maximum likelihood, and Cramer-Rao bound

    Publication Year: 1989, Page(s):720 - 741
    Cited by:  Papers (1177)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1638 KB)

    The performance of the MUSIC and ML methods is studied, and their statistical efficiency is analyzed. The Cramer-Rao bound (CRB) for the estimation problems is derived, and some useful properties of the CRB covariance matrix are established. The relationship between the MUSIC and ML estimators is investigated as well. A numerical study is reported of the statistical efficiency of the MUSIC estimat... View full abstract»

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  • A VLSI systolic adder for digital filtering of delta-modulated signals

    Publication Year: 1989, Page(s):749 - 754
    Cited by:  Papers (14)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A fully systolic VLSI architecture allowing addition of N sequentially available input numbers is presented. It consists of a bit-level systolic adder, systolically resettable, which accumulates the partial sums, and of a systolic control network which provides the correct signs of the input data. This architecture has all the advantages of systolic arrays, such as concurrence of calculations and ... View full abstract»

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  • Estimating the intrinsic dimensionality of discrete utterances

    Publication Year: 1989, Page(s):755 - 757
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB)

    The intrinsic dimensionally (ID) of different sets of isolated word utterances is estimated through a method recently proposed by K.W. Pettis et al. (1979). This results show ID values ranging from 3 to 15, which are consistent with the intuitive degree of difficulty associated to the sets considered. Also, some speculative applications of ID estimating are discussed.<> View full abstract»

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  • Stability of recursive QRD-LS algorithms using finite-precision systolic array implementation

    Publication Year: 1989, Page(s):760 - 763
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (377 KB)

    A proof of the stability (in the sense of bounded input/bounded output) of the recursive QRD-LS algorithm using finite-precision systolic array implementation is presented. Two popular systolic array structures are considered. A similar proof can be extended to other systolic implementations. The first structure discussed is due to W.M. Gentleman and H.T. Kung (1981), and the second one is due to ... View full abstract»

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  • Frequency-varying sinusoidal modeling of speech

    Publication Year: 1989, Page(s):763 - 765
    Cited by:  Papers (14)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (307 KB)

    A sinusoidal model is presented where the nonstationary nature of speech is considered by using a time-varying frequency and amplitude for each sinusoid. The proposed model generalizes other sinusoidal models while still having an analytically tractable short-time spectrum. The estimation of the parameters of the sinusoids is done in the frequency domain by a suboptimal linear estimator. The exper... View full abstract»

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  • Efficient realizations of two-dimensional quadratic digital filters

    Publication Year: 1989, Page(s):765 - 768
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (319 KB)

    Realization structures of two-dimensional finite-support quadratic digital filters which are based on matrix decomposition are introduced. The resulting structures consist generally of a number of parallel branches which operate simultaneously and independently on a common input array. By proper decomposition of the coefficient matrix, each parallel branch can be realized by a two-dimensional fini... View full abstract»

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  • On counting rules in distributed detection

    Publication Year: 1989, Page(s):772 - 775
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    A distributed network of n identical sensors sending their binary decisions to a fusion center is studied. The asymptotic performance of k out of n rules at the fusion center for finite k (finite (n-k)) is evaluated. For these rules, the error probability of making a wrong decision does not tend to zero as n to infinity , unless the probability distributions under the hypothesis satisfy certain co... View full abstract»

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  • Distributed detection of a signal in generalized Gaussian noise

    Publication Year: 1989, Page(s):775 - 778
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB)

    The problem of distributed detection of a signal in incompletely specified noise is conducted. The noise assumed belongs to the generalized Gaussian family, and the sensors in the distributed network use the Wilcoxon test. The sensors pass the test statistics to a fusion center, where a hypothesis testing results in a decision regarding the presence or the absence of a signal. Three monotone and a... View full abstract»

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  • A block coding technique for encoding sparse binary patterns

    Publication Year: 1989, Page(s):778 - 780
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB)

    An efficient method is presented for encoding sparse binary patterns. This method is very simple to implement and performs in a near-optimum way. The sparse pattern is assumed to be a memoryless binary source. This kind of pattern is found in a three-dimensional authentication scheme. In the data compression area, the patterns are usually not memoryless sources. However, when LPC (linear predictio... View full abstract»

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  • Parallel VLSI computing array implementation for signal subspace updating algorithm

    Publication Year: 1989, Page(s):742 - 748
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The parallel VLSI computing array implementation is discussed for novel signal subspace iteration algorithm (SSIA) proposed by I. Karasalo (1986). By making use of a sparse structure, a linearly connected VLSI computing structure is developed for the singular valve decomposition operation used in this algorithm. It is first shown that by making use of a sparse structure matrix the computing time o... View full abstract»

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  • A derivation of the normal equation in FIR Wiener filters

    Publication Year: 1989, Page(s):759 - 760
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    In developing the normal equation of the finite-duration impulse-response Wiener filter, the method of taking a gradient of scalar-valued mean-square error to complex tap-weight vector is discussed. A variational method used to attain the normal equation is also included View full abstract»

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  • Cramer-Rao bounds for AR parameter and reflection coefficient estimators

    Publication Year: 1989, Page(s):769 - 772
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The finite examples Cramer-Rao bound for the autoregressive parameters of a Gaussian autoregressive model is given in closed form. Quick algorithms for computing this bound for the autoregressive parameters and also for the reflection coefficients are presented. The exact bounds are of interest since they can differ appreciably from the asymptotic bounds. If replicated independent records are avai... View full abstract»

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  • Asymptotically optimal detection in incompletely characterized non-Gaussian noise

    Publication Year: 1989, Page(s):627 - 633
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The problem of detecting a signal known except for amplitude in non-Gaussian noise is addressed. The noise samples are assumed to be independent and identically distributed with a probability density function known except for a few parameters. Using a generalized likelihood ratio test, it is proven that, for a symmetric noise probability density function, the detection performance is asymptoticall... View full abstract»

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  • On the design of FIR filters by complex Chebyshev approximation

    Publication Year: 1989, Page(s):702 - 712
    Cited by:  Papers (78)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    The long-standing problem of approximating a complex-valued desired function with a finite impulse-response (FIR) filter is considered. It is formulated as an equalization to be solved using complex-valued filters. The proposed algorithm deals directly with the complex error function, which depends linearly on the coefficients of the filter to be designed. The magnitude of this error function is m... View full abstract»

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  • Performance of fast time delay estimators

    Publication Year: 1989, Page(s):757 - 759
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The performances of fast time delay estimators, the hybrid-sign, and the polarity coincidence have been evaluated for general signal and noise spectra and compared to the classical direct technique. Some physical spectra have been analyzed in particular for the white noise case: polarity coincidence time delay estimation has been verified to exceed hybrid sign time delay estimation for large SNR a... View full abstract»

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  • Interpolation by the FFT revisited-an experimental investigation

    Publication Year: 1989, Page(s):665 - 675
    Cited by:  Papers (55)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A numerical investigation into the accuracy of interpolation by, fast Fourier transform (FFT), using a sinusoidal test signal, is described. The method is precisely defined, including a previously unnoticed detail which makes a significant difference to the accuracy of the result. The experiments show that, with no input windowing, the accuracy of interpolation is almost independent of sinusoidal ... View full abstract»

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  • Comparison of adaptive and robust receivers for signal detection in ambient underwater noise

    Publication Year: 1989, Page(s):621 - 626
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Three receivers are compared for the detection of a known signal in additive ambient underwater noise of seagoing merchant vessels. These receivers are: the matched filter, which is the classical linear receiver based on a Gaussian assumption; the correlation-limiter, which is the Neyman-Pearson minimax robust receiver when the noise uncertainty is modeled as a mixture process with a Gaussian nomi... 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