International Conference on Acoustics, Speech, and Signal Processing

3-6 April 1990

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  • ICASSP 90. 1990 International Conference on Acoustics, Speech and Signal Processing (Cat. No.90CH2847-2)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (573 KB)
    Freely Available from IEEE
  • A fast computational algorithm for the QR-like decomposition of the modified covariance method of linear prediction

    Publication Year: 1990
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

    Summary form only given. A fast QR algorithm for the batch modified covariance method of linear prediction that is the companion to the fast Cholesky algorithm has been developed. A Fortran program that performs the QR solution for the linear prediction parameters has also been developed. The numerical accuracies of the fast QR algorithm and fast Cholesky algorithm solutions for the least-squares ... View full abstract»

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  • Adaptive comb filters for enhancement of quasi periodic signals

    Publication Year: 1990, Page(s):1461 - 1464 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Adaptive comb filters (ACFs) have notches at multiples of the fundamental frequency. For the ACF proposed only one parameter is adapted for removal of harmonic components. The RML (recursive maximum-likelihood) algorithm used is much less complex than the existing ones. The ACF is implemented as cascaded second-order cells and only the parameter of the first cell is estimated. Depending on the ene... View full abstract»

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  • Phoneme-level parameterization of speech using an articulatory model

    Publication Year: 1990, Page(s):337 - 340 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    An analysis scheme is presented for estimating the phoneme-level articulatory parameters to obtain best fits to natural speech. The working units of optimization are the parameters of an articulatory model (one vector per phoneme) and vectors of time and speed of transition for each parameter. The output of a text-to-speech system is used to initialize these parameters. A single prototype interpol... View full abstract»

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  • High quality time scale modification of speech signals using fast synchronized-overlap-add algorithms

    Publication Year: 1990, Page(s):409 - 412 vol.1
    Cited by:  Papers (6)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Some important modifications that make the synchronized overlap-add (SOLA) algorithm of S. Roucos and A.M. Wilgus (Proc. IEEE ICASSP, p.493-6, 1985) faster while obtaining higher quality are presented. The modifications require the transmission of the synchronization factor. This results in a set of modifications of the original SOLA algorithm that cover the range from high-quality, nonreverberant... View full abstract»

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  • A fast exact least mean square adaptive algorithm

    Publication Year: 1990, Page(s):1457 - 1460 vol.3
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A general block-formulation is presented for the LMS (least-mean-square) algorithm for adaptive filtering. This formulation has an exact equivalence with the initial LMS, hence retaining the same convergence properties while allowing a reduction in the arithmetic complexity, even for very small block lengths. Furthermore, tradeoffs between number of operations and convergence rate are obtainable b... View full abstract»

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  • A linear periodically time-varying filter for time-frequency scaling of speech

    Publication Year: 1990, Page(s):405 - 408 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A method is introduced for finding a signal fˆ(n ) with a time-varying spectrum Cˆ(nω) approximating a geometric transformation C(αn,βω) in the mean-square sense. The phases of C(n,ω) and C(αn ,βω) are allowed to differ by a smooth function of n View full abstract»

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  • A variable-step LMS based on tap weight time variation

    Publication Year: 1990, Page(s):1453 - 1456 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A promising method is introduced for adjusting the LMS (least-mean-square) step size μ, based on the time variation of the tap weights. This method belongs to the class of diagonal step-matrix algorithms: a separate μ is used for each tap weight. Computer simulations are presented for a self-tuning filter configuration operating on a sine wave of abruptly changing frequency in Gaussian white... View full abstract»

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  • A new numerically stable structure for fast RLS adaptive filtering

    Publication Year: 1990, Page(s):1409 - 1412 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A numerically stable structure is presented in which the conventional fast transversal recursive-least-squares (RLS) algorithms and a mixed time-and-order (MTO) updating procedure are combined to provide instantaneous RLS solution for each time step with O( M) computations, where M is the order of filter. Since the new structure is continuously propagated only over 2... View full abstract»

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  • Complexity reduction in Volterra connectionist modelling by consideration of output mapping

    Publication Year: 1990, Page(s):885 - 888 vol.2
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The output mapping method is used to demonstrate an approach which makes the Volterra connectionist model highly efficient computationally, in comparison with current neural networks. Although the system was applied to yield linear recognizers, exactly the same approach can be used to reduce the order of a nonlinear recognizer. The network is not constrained to fit arbitrary indices and may utiliz... View full abstract»

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  • Variable parameter speaker verification system based on hidden Markov modeling

    Publication Year: 1990, Page(s):281 - 284 vol.1
    Cited by:  Papers (16)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A text-independent speaker verification system based on an adaptive vocal tract model which emulates the vocal tract of the speaker is described. Each speaker is represented by a set of feature vectors derived from speech segments belonging to different classes of phonemes. Linear predictive hidden Markov modeling and maximum-likelihood Viterbi decoding are applied to a speech utterance to obtain ... View full abstract»

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  • An auditory model based on the analysis of envelope patterns

    Publication Year: 1990, Page(s):401 - 404 vol.1
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An auditory model incorporating critical band filtering, short time adaptation, and temporal analysis of the auditory nerve responses is presented. Unlike previously proposed synchrony models, this model emphasizes the instantaneous amplitude (i.e. the envelope) of the neural responses rather than the instantaneous frequency as the carrier of perceptually relevant information. It is demonstrated h... View full abstract»

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  • On the implementation of adaptive filters with adjustable linear constraints

    Publication Year: 1990, Page(s):1449 - 1452 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Linearly constrained systems are specified using a set of vector inner products with the filter weights in which each of the M inner products is constrained to equal a scalar value. The constraint vectors are presumed known and fixed while adaptation takes place on the M constraint scalars. The filter structure simultaneously adapts to minimize output power while maintaining the ... View full abstract»

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  • Vector quantization and perceptual criteria in SVD based CELP coders

    Publication Year: 1990, Page(s):33 - 36 vol.1
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Experiments in which singular value decomposition (SVD) is applied to code excited linear prediction (CELP) coders are presented. This means that the concept of selection of the optimum innovation pattern through an analysis by synthesis (ABS) method can be replaced by a weighted mean-squared-error computation in a transformed domain. The transformed signal is obtained by representing the residual... View full abstract»

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  • A new algorithm for iterative deconvolution of sparse spike trains

    Publication Year: 1990, Page(s):1547 - 1550 vol.3
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    An iterative algorithm for deconvolution of Bernoulli-Gaussian processes is presented. This detection-estimation problem is formulated as that of a change of initial conditions in linear least-squares estimation. An algorithm with a very simple structure is obtained. It allows the evaluation of either marginal or joint likelihood criteria without any approximation; the resulting method is easy to ... View full abstract»

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  • A hidden Markov model approach to the classification of acoustic transients

    Publication Year: 1990, Page(s):2731 - 2734 vol.5
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A system for the detection and classification of acoustic transients based on hidden Markov model (HMM) methods is described. The system was tested using two different sets of data. The results from these tests are summarized and compared to some other known algorithms and to the performance of human beings. The effect of observation noise on the training and classification process is also discuss... View full abstract»

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  • Modified LMS algorithms for robust ADPCM

    Publication Year: 1990, Page(s):1405 - 1408 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The robustness of adaptive differential pulse code modulation (ADPCM) systems versus transmission errors is addressed. To secure the stability of the decoder, it is necessary to modify the form of the LMS (least-mean-square) algorithm used to adapt the predictor. Solutions introducing soft constraints are investigated. The leakage algorithm is proved to be not fully satisfactory, and a new stabili... View full abstract»

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  • Morphological signal decomposition

    Publication Year: 1990, Page(s):2169 - 2172 vol.4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A method of signal analysis is presented. It is based on mathematical morphology of gray scale functions. The proposed representations are translation invariant and use simple functions as the components of the representation. The analysis is unique and the signal can be reconstructed from its components. This method can be used for multiscale signal representation and signal recognition. It can a... View full abstract»

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  • An approximate maximum entropy solution for bearing estimation of coherent sources

    Publication Year: 1990, Page(s):2875 - 2878 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A method for finding an approximate solution of the maximum entropy (ME) method for bearing estimation is presented. It is especially suitable for the coherent source problem. This solution shows that the ME spectrum is an all-pole spectrum and the coefficients of its denominator polynomial can be found from the estimation error for the signals. Since no spatial smoothing is required, it is possib... View full abstract»

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  • Chebyshev polynomial based transfer functions for orthogonal lattice filters

    Publication Year: 1990, Page(s):1341 - 1344 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A modification to the standard Schur algorithm is introduced. This is achieved by transforming the power series polynomials from the z domain to the Chebyshev polynomial domain. This transformation is performed using the mathematical formulae. The Schur algorithm is reformulated in the Chebyshev domain, and it is shown that this modified version has a similar complexity to the original v... View full abstract»

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  • Discrete-time nonlinear systems modeling

    Publication Year: 1990, Page(s):2587 - 2590 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Systems theory and some canonical representations are introduced for a class of nonlinear systems. Techniques are devised to identify, synthesize, and model such systems and their signals. Nonlinear systems theory is introduced at a fundamental level. To identify a system from input and output (or just output) data, parameters are estimated for a canonical state-space or difference-equation repres... View full abstract»

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  • Stabilized complex downdating in adaptive beamforming

    Publication Year: 1990, Page(s):2659 - 2662 vol.5
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Two main findings are reported. The first is an extension to the complex case of the stabilized hyperbolic Householder transformation. The second is a demonstration by computer simulations that this complex stabilized hyperbolic Householder transformation exhibits superior numerical behavior in beamforming applications relative to its conventional counterpart. The problem statement for stabilized ... View full abstract»

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  • A dual form adaptive filter

    Publication Year: 1990, Page(s):1433 - 1436 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A structure for adaptive arrays (or filters) is proposed and analyzed. It is based on a dual solution of the constrained Wiener filtering problem that arises in broadband linearly constrained adaptive arrays. The primary advantage of the dual solution is that the update equations of the adaptive algorithm involve the Lagrange multipliers of the constrained optimization problem. Hence, the dimensio... View full abstract»

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  • Discriminant methods for improving the robustness of Mandarin syllables recognition based upon hidden Markov model

    Publication Year: 1990, Page(s):561 - 564 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Two types of hidden Markov modeling (HMM), discrete-type (vector quantization (VQ)-based) and mixture density, are used to overcome part of the problem of Mandarin syllable recognition. In the VQ-based HMM part, a two-stage process is used to generate a VQ codebook in the hope of avoiding the possible domination of the vowel signal vectors on the codewords in vector space. A polyobservation sequen... View full abstract»

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  • ATR HMM-LR continuous speech recognition system

    Publication Year: 1990, Page(s):53 - 56 vol.1
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    An improvement of the hidden Markov model (HMM) LR continuous-speech recognizer using multiple codebooks, HMM state duration control and fuzzy vector quantization is described. The system recognizes Japanese phrases (Bunsetsu) according to a context-free grammar including 1035 words. In speaker-dependent conditions, a phrase recognition rate of 88.4% (99.0% for the top five candidates) was attaine... View full abstract»

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