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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 8 • Date Aug. 1988

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Displaying Results 1 - 22 of 22
  • Effect of course maneuvers on bearings-only range estimation

    Publication Year: 1988, Page(s):1193 - 1199
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1524 KB)

    The Cramer-Rao lower bound (CRLB) is used to examine the relative merits of tracking strategies in bearings-only target motion analysis. A formula is derived for the expected range error from a maximum-likelihood estimator (MLE) for the long-range situation. Monte Carlo simulations, with respect to the measurement noise, are used to show that for small amounts of noise the variance of the MLE rang... View full abstract»

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  • Multiband excitation vocoder

    Publication Year: 1988, Page(s):1223 - 1235
    Cited by:  Papers (275)  |  Patents (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1535 KB)

    A speech model, referred to as the multiband excitation model, is presented. In this model the band around each harmonic of the fundamental frequency is declared voiced or unvoiced. Estimation methods for the parameters of the model are developed and methods to synthesize speech from the model parameters are described. To illustrate a potential application of the speech model, an 8 kb/s vocoder is... View full abstract»

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  • Minimum worst case processing loss

    Publication Year: 1988, Page(s):1369 - 1371
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A figure of merit-the worst-case processing loss-is defined to characterize a data window's influence on the detection of a tone in broadband noise using the discrete Fourier transform. The minimum loss is close to -3 dB and occurs when the window's normalized second moment is about 1/5 View full abstract»

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  • Robust image modeling techniques with an image restoration application

    Publication Year: 1988, Page(s):1313 - 1325
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1424 KB)

    A robust parameter-estimation algorithm for a nonsymmetric half-plane (NSHP) autoregressive model, where the driving noise is a mixture of a Gaussian and an outlier process, is presented. The convergence of the estimation algorithm is proved. An algorithm to estimate parameters and original image intensity simultaneously from the impulse-noise-corrupted image, where the model governing the image i... View full abstract»

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  • Image representation by one-bit Fourier phase: theory, sampling, and coherent image model

    Publication Year: 1988, Page(s):1292 - 1304
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1596 KB)

    The problem of recovering an image from its Fourier-transform phase quantized to one bit, or, equivalently, finding the locations of the zero crossings of the real part of the Fourier transform, is addressed. Theoretical results are presented that set an algebraic condition under which real zero crossings uniquely specify a band-limited image. It is then shown that sampling in the frequency domain... View full abstract»

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  • Focussing matrices for coherent signal-subspace processing

    Publication Year: 1988, Page(s):1272 - 1281
    Cited by:  Papers (241)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A class of focussing matrices is proposed for use in the coherent signal-subspace method (CSM) (H. Wang and M. Kaveh, ibid., vol.ASSP-33, Aug. 1985). When the directions-of-arrival of wideband sources fall into more than one group of one beamwidth each, this class leads to performance substantially better than those suggested in previous studies on direction-of-arrival estimation. New insight into... View full abstract»

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  • A channel efficient method for high-resolution active direction finding of multiple targets

    Publication Year: 1988, Page(s):1367 - 1369
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A high-resolution direction-finding method for active systems is presented. Unlike the available high-resolution method, which requires the number of coherent receiver channels to be larger than the number of targets, this method requires only two (three) channels for one (two)-dimensional direction-finding, regardless of the number of targets to be resolved, thus reducing the implementation cost.... View full abstract»

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  • Embedded delta modulation

    Publication Year: 1988, Page(s):1236 - 1243
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    In an embedded delta modulation (EDM) encoder, a supplemental pulse-code-modulation (PCM) encoder processes the error signal of a delta modulator. The PCM and DM bit streams are multiplexed and then transmitted. The decoder adds and then filters the analog versions of the separately decoded PCM and DM signals. To enhance the efficiency of EDM, it is desirable to filter and decimate the DM error si... View full abstract»

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  • Target parameter estimation in the near field with two sensors

    Publication Year: 1988, Page(s):1357 - 1360
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A performance-prediction procedure is presented for the evaluation of a passive-tracking technique for the localization of targets in the near field of two sensors. Parameter identifiability is established with the aid of the Fisher information matrix, which is evaluated for various combinations of measurements. This is used to determine bounds on localization performance. The corresponding uncert... View full abstract»

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  • A robust approach to sequential detection

    Publication Year: 1988, Page(s):1200 - 1210
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    The problem of signal detection in severe and/or changing noise environments, often encountered in underwater acoustics, radar, and some communications applications, is considered. The detector operates at near optimum levels for a particular noise environment, and is robust by virtue of maintaining high efficiency in other than nominal noise environments by adapting its optimum nonlinearity using... View full abstract»

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  • Adaptive trimmed mean filters for image restoration

    Publication Year: 1988, Page(s):1326 - 1337
    Cited by:  Papers (78)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    An adaptive smoothing filter is proposed for reducing noise in digital signals of any dimensionality. The adaptive procedure is based on the selection of an appropriate inner or outer trimmed mean filter according to local measurements of the tail behavior (impulsivity) of the noise process. The set of trimmed means used provides robustness against a wide range of noise possibilities ranging from ... View full abstract»

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  • Inhomogeneous Gaussian image models for estimation and restoration

    Publication Year: 1988, Page(s):1305 - 1312
    Cited by:  Papers (26)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    Two inhomogeneous Gaussian-image models are presented for estimation and restoration. By incorporating the local statistics of an image, a homogeneous autoregressive (AR) random field can be extended to an inhomogeneous AR field. This inhomogeneous random field can provide a better description of the image than the homogeneous one. As a consequence of this improved modeling, a minimum-mean-square-... View full abstract»

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  • Adaptive algorithms for constrained ARMA signals in the presence of noise

    Publication Year: 1988, Page(s):1282 - 1291
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    A family of algorithms is developed for adaptive parameter estimation of constrained autoregressive moving-average (ARMA) signals in the presence of noise. These algorithms utilize a priori information about the signal's properties, such as its spectral type (for example, low-pass, bandpass, etc.) or a spatial-domain characteristic. Special applications include modeling of autoregressions (AR) and... View full abstract»

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  • Stack filters and the mean absolute error criterion

    Publication Year: 1988, Page(s):1244 - 1254
    Cited by:  Papers (149)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1044 KB)

    A method to determine the stack filter which minimizes the mean absolute error between its output and a desired signal, given noisy observations of this desired signal, is presented. Specifically, an optimal window-width-b stack filter can be determined with a linear program with O(b2b) variables. This algorithm is efficient since the number of different inputs to a wi... View full abstract»

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  • On statistical identification of a class of linear space-invariant image blurs using non-minimum-phase ARMA models

    Publication Year: 1988, Page(s):1360 - 1363
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    An optimal statistical parameter estimation technique was previously presented by the authors (ibid., vol.ASSP-34, p.963-72) for the identification of a class of unknown linear systems that can be modeled by a zero-phase finite impulse response filter. This technique is now extended to a more general case using a spectrally equivalent minimum-phase (SEMP) representation of the system. The original... View full abstract»

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  • Optimum FIR array filters

    Publication Year: 1988, Page(s):1211 - 1222
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    An optimum finite impulse response (FIR) filter bank is derived that recovers a desired signal from an array of sensors in the presence of random sensor noise and one or more coherent interfering noise sources. The required filter order is determined by the relative delays between the signal and coherent noise at each sensor, and is independent of the time duration of either the signal or coherent... View full abstract»

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  • On resolving two-dimensional sinusoids in white noise using different spectral estimates

    Publication Year: 1988, Page(s):1338 - 1350
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Several well-known spectrum estimates are examined in terms of their performance in resolving two closely located sinusoids in white noise. Closed-form expressions for the estimates, using the different approaches and models, are derived and used to study the resolution question. The notions of 3-dB contour and single-peak area (SPA) are introduced and used to compare the different models. The har... View full abstract»

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  • On determining optimum multirate structures for narrow-band FIR filters

    Publication Year: 1988, Page(s):1255 - 1271
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    Several lower bounds on the storage and multiplication rate required to implement a bandpass filter using multirate structures are developed. These lower bounds suggest hypothetical optimum structures that actual optimum structures are found to resemble. The hypothetical structures are useful for predicting the number of stages, decimation and interpolation factors, and cost of actual structures f... View full abstract»

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  • Maximum likelihood estimation of the autoregressive model by relaxation on the reflection coefficients

    Publication Year: 1988, Page(s):1363 - 1367
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    A method for autoregressive parameter estimation, which successively maximizes the likelihood with respect to each reflection coefficient while keeping the others fixed, is presented. The algorithm generalizes the recursive-maximum-likelihood technique of S.M. Kay (1983), which corresponds to performing only one iteration cycle. An interesting application is the estimation of a Toeplitz covariance... View full abstract»

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  • Bias and resolution of the MUSIC and the modified FBLP algorithms in the presence of coherent plane waves

    Publication Year: 1988, Page(s):1351 - 1352
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    A study of the characteristics of the MUSIC and the modified forward-backward linear prediction (MFBLP) methods of angle-of-arrival estimation, in terms of their sample bias and resolution in the fully correlated signal environment, is presented. Using Monte Carlo simulations, it is shown that the MFBLP algorithm has better capability in resolving two fully correlated signals than the spatially sm... View full abstract»

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  • Computationally efficient stepup and stepdown procedures for real predictor coefficients

    Publication Year: 1988, Page(s):1353 - 1355
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Algorithms are presented for the stepup and stepdown problem for the real case. It is shown that the split Levinson algorithm and similar algorithms can be used to reduce the multiplicative complexity of the problem considerably View full abstract»

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  • A note on line spectral frequencies [speech coding]

    Publication Year: 1988, Page(s):1355 - 1357
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The main properties of line spectral frequencies (LSFs) are analyzed by means of the root-locus technique. This leads to a better insight into the nature of this efficient predictor filter parametrization. The effects of quantization of the LSFs are illustrated by a numerical example 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