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Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Date 3-6 April 1990

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Displaying Results 1 - 25 of 725
  • ICASSP 90. 1990 International Conference on Acoustics, Speech and Signal Processing (Cat. No.90CH2847-2)

    Publication Year: 1990
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    Freely Available from IEEE
  • Fast speaker adaptation for speech recognition systems

    Publication Year: 1990, Page(s):133 - 136 vol.1
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Different speaker adaptation methods for speech recognition systems adapting automatically to new and unknown speakers in a short training phase are discussed. The adaptation techniques aim at transformations of feature vectors, optimized with respect to some constraints. Two different adaptation strategies are discussed. The first one is based on least mean-squared-error optimization. The second ... View full abstract»

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  • Behaviour analysis of adaptive ARMA predictors with nonstationary inputs

    Publication Year: 1990, Page(s):1819 - 1822 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The behavior of autoregressive moving average (ARMA) predictors is analyzed for neglected dynamic cases with nonstationary signals. For this analysis, nonstationarity types must be considered (abrupt or smooth changes in the mean and variance). Some procedures can be used to improve the algorithm performances and limit the self-stabilization oscillations. The resulting algorithm is not much more c... View full abstract»

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  • Discrete cosine transform filtering

    Publication Year: 1990, Page(s):1281 - 1284 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Circular convolution-multiplication relationships for the discrete cosine transform (DCT) that are similar to those for the discrete Fourier transform (DFT) are developed. The relations are valid if the filter frequency response is real and even. Two fairly simple relations are developed. The multiplication of the DCT of signal sequence and the DFT of filter sequence results in circular convolutio... View full abstract»

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  • 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 (84 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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  • Laplacian pyramid versus wavelet decomposition for image sequence coding

    Publication Year: 1990, Page(s):1965 - 1968 vol.4
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Implementation of a set of pyramid transforms in a hierarchical approach for a real television sequence which consists of a 3-D data information set is presented. The investigation is based on several visual and objective comparative criteria, including the relevance to the motion information. Several pyramid transforms for image sequence coding are investigated and compared. The nonorthogonal pyr... View full abstract»

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  • DSP specification using the Silage language

    Publication Year: 1990, Page(s):1056 - 1060 vol.2
    Cited by:  Papers (28)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The Silage language is presented, together with a number of extensions to the original design which result in a powerful specification language and design environment for complex digital signal processing (DSP) systems. Aspects of Silage discussed include the applicative language, timing information and time-domain operations, data typing, and functional language, pragmatic directives, and loops a... View full abstract»

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  • Compensation for mutual coupling effects in direction finding

    Publication Year: 1990, Page(s):2631 - 2634 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Mutual coupling between array sensors is studied, and schemes for compensating for these effects are proposed. Particular attention is given to nonsearch algorithms such as ESPRIT and the moving window. Computer simulations are included to demonstrate the effectiveness of the proposed compensation schemes View full abstract»

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  • Results on the application of simulated annealing algorithm for the design of digital filters with powers-of-two coefficients

    Publication Year: 1990, Page(s):1301 - 1304 vol.3
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Results on the application of the simulated annealing (SA) algorithm to the problem of finding the coefficients of a digital filter with very coarse coefficients values (namely, power-of-two) are presented. For a minimax criterion in the frequency response, the algorithm was found particularly useful for designing a cascade-form FIR (finite impulse response) filter whose performance is known to be... View full abstract»

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  • A dynamical systems approach to speech processing

    Publication Year: 1990, Page(s):365 - 368 vol.1
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    An approach to speech processing, based on nonlinear dynamical systems, is presented. It is shown that two fundamental problems in speech processing, dimensionality reduction and nonlinear temporal variability, can be addressed using geometrical methods from nonlinear dynamics. An effective dynamical system is extracted by training a nonlinear predictor of the signal samples. A variety of signal c... View full abstract»

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  • A novel blind adaptive equalization technique

    Publication Year: 1990, Page(s):1445 - 1448 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A preliminary study of a new adaptive equalization technique is addressed. The new technique consists of two cascade stages: an adaptive blind amplitude equalizer (ABAE) and a commonly used adaptive linear equalizer (ALE). The ABAE can compensate the amplitude distortion of the channel without the need for the values of the desired signals or the decision-directed symbols, so as to mitigate the bu... View full abstract»

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  • Multiuser sonar properties for Costas array frequency hop coded signals

    Publication Year: 1990, Page(s):2727 - 2730 vol.5
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The cross-ambiguity properties of Costas-array frequency-hop coded signals for use in wideband multiuser sonar systems are established. In order to prevent system crosstalk, cross-ambiguity function for the signals should be minimized. The conditions under which Costas arrays achieve the minimum value of their cross-ambiguity functions are provided. The upper bound on the maximum number of hits in... View full abstract»

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  • Subband coding of video with adaptive vector quantization

    Publication Year: 1990, Page(s):2109 - 2112 vol.4
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A low bit rate adaptive video coding technique is proposed. The redundancy within adjacent video frames is exploited by motion-compensated interframe prediction, and the motion-compensated frame difference (MCFD) signal is decomposed by using a quadrature mirror filter (QMF) structure. The subband signals are vector quantized adaptively. The MCFD signals are low correlated, hence transform coding ... View full abstract»

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  • The Frazier-Jawerth transform

    Publication Year: 1990, Page(s):2483 - 2486 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The Frazier-Jawerth transform (FJT), a simple yet rigorous method for the time-frequency analysis of nonstationary signals, is discussed. The FJT is related to the wavelet transform. Both the FJT and the wavelet methods improve upon the classical methods of time-frequency analysis due to Wigner and Gabor. A tutorial introduction to the FJT is given, and a brief discussion is presented of an exampl... View full abstract»

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  • On mask selection for time-varying filtering using the Wigner distribution

    Publication Year: 1990, Page(s):2487 - 2490 vol.5
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The application of a multiplicative modification function, or mask, to the Wigner distribution (WD) of a signal has been proposed as an implementation of time-varying filtering in the time-frequency plane. Because the least squares synthesis technique involves an eigenvalue/eigenvector decomposition, the effects of mask size, shape, and placement on the reconstructed system output are not well und... View full abstract»

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  • A morphological model for large vocabulary speech recognition

    Publication Year: 1990, Page(s):577 - 580 vol.1
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A morphological model, applicable to inflected languages, which combines the robustness of the tripos model with the prediction power of the lemma is proposed. A semantic component acts at the lemma level, without taking into account the different inflections of a lemma, thus making its trainable even for 200000 words. The training corpus for the lemma model (consisting of 38 million words) is lab... View full abstract»

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  • A comparison of element and beam space spatial-spectrum estimation for multiple source clusters

    Publication Year: 1990, Page(s):2643 - 2646 vol.5
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Some of the relative advantages and disadvantages of performing eigenspace spatial-spectrum estimation in beam-space as opposed to element-space are considered. The issue of relative performance, specifically spectral-resolvability and peak position variance and bias, are addressed. It is concluded that when there are only sources impinging from a single sector (the sector selected for beam-space ... View full abstract»

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  • Robust pitch determination via SVD based cepstral methods

    Publication Year: 1990, Page(s):253 - 256 vol.1
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A greatly enhanced cepstral-based pitch estimator which uses the MUSIC algorithm for estimating background noise characteristics is presented. This approach couples the signal enhancement capabilities of MUSIC, which is based on singular value decomposition (SVD) orthogonalization, with the harmonic spectrum estimation capabilities of the cepstrum. Marked improvements are demonstrated over standar... View full abstract»

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  • Effect of floating-point error reduction with recursive least square for parallel architecture

    Publication Year: 1990, Page(s):1487 - 1490 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A finite wordlength floating-point error analysis for the RLS (recursive least squares) algorithm using UD factorization is presented. It is known that this algorithm is suitable for parallel architectures; however, it is not known how the wordlength of the algorithm should be chosen for hardware implementation. An investigation is conducted of the relation between the word length and the converge... View full abstract»

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  • Statistical analysis of a change detector based on image modeling of difference picture

    Publication Year: 1990, Page(s):2185 - 2188 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A statistical analysis of a change detector for motion detection based on image modeling of a difference picture is presented. The approach is founded upon the fact that complete silhouettes of moving objects can be segmented at each frame time using a change detector based on image modeling of the difference picture. The change detection problem can be treated as a signal detection problem in whi... View full abstract»

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  • Use of penalty function or Lagrangian multipliers for constrained deconvolution

    Publication Year: 1990, Page(s):1559 - 1562 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Two methods are presented to achieve constrained deconvolution. The first is based on the use of the classical penalty function in the optimization procedure. This approach allows the introduction of various kinds of constraints. The second is more particular, because it works only with some constraints, especially with a positivity constraint. In this case, the use of Lagrangian multipliers gives... View full abstract»

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  • ESPRIT with perturbed subarrays

    Publication Year: 1990, Page(s):2947 - 2950 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The effectiveness of the ESPRIT direction-finding algorithm in the presence of array perturbations is addressed. For the single-signal case, expressions are found for the errors in the angle of arrival due to element location perturbations, element gain and phase errors, and subarray rotations. Results are also presented for the multiple signal situation. For random location perturbations, the var... View full abstract»

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  • Robust speaker-independent word recognition using static, dynamic and acceleration features: experiments with Lombard and noisy speech

    Publication Year: 1990, Page(s):857 - 860 vol.2
    Cited by:  Papers (39)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Speaker-independent recognition of Lombard and noisy speech by a recognizer trained with normal speech is discussed. Speech was represented by static, dynamic (first difference), and acceleration (second difference) features. Strong interaction was found between these temporal features, the frequency differentiation due to cepstral weighting, and the degree of smoothing in the spectral analysis. W... View full abstract»

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  • Pitch predictors with high temporal resolution

    Publication Year: 1990, Page(s):661 - 664 vol.2
    Cited by:  Papers (43)  |  Patents (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A first-order pitch predictor is described whose delay is specified as an integer number of samples plus a fraction of a sample at the current sampling rate. This realization has a better performance than conventional multiple coefficient predictors and leads to more efficient coding of the predictor parameters. Also discussed is the application of noninteger delay pitch predictors to low-bit-rate... View full abstract»

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  • Tomographic imaging algorithm based on circular arc projections

    Publication Year: 1990, Page(s):2337 - 2340 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    An algorithm is developed to reconstruct the two-dimensional (2-D) image of the surface plane or section plane of an object from reflected signal data when a sensor moves along a straight-line path. It is considered as a tomographic imaging problem from arc projections. The principle of tomographic imaging is introduced and an imaging algorithm is derived. Computer simulation results are given. Th... View full abstract»

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