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ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing

11-14 April 1988

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Displaying Results 1 - 25 of 718
  • A generalized vocal tract model for pole-zero type linear prediction (speech processing)

    Publication Year: 1988, Page(s):687 - 690 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (349 KB)

    The authors consider a generalized acoustic tube model of the vocal tract, relating it to the pole-zero type linear prediction. The generalization is done by including the nasal cavity for the modeling, thus forming a three-branched model. The transfer function is obtained from the generalized model by conglomerating one of the three branches to the branch section at the junction of the three bran... View full abstract»

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  • Fractal dimension estimation by adaptive mask selection

    Publication Year: 1988, Page(s):1116 - 1119 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB)

    An algorithm is presented for solving conflicts between noise reduction and correct fractal dimension estimates. The basic idea has been derived from edge-preserving methods, which have been used for similar problems. Around each pixel, different masks are used; the most homogeneous neighborhood (in terms of fractal dimension) is then selected, and the fractal dimension D of the region is computed... View full abstract»

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  • Adaptive filtering via cumulants and LMS algorithm

    Publication Year: 1988, Page(s):1479 - 1482 vol.3
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    A novel adaptive identification scheme is introduced for a nonGaussian white-noise-driven linear, nonminimum-phase FIR (finite-impulse response) system. The adaptive scheme is based on noncausal autoregressive (AR) modeling of higher-order cumulants of the system output. In particular, the magnitude and phase response estimates at each iteration are expressed in terms of the updated parameters of ... View full abstract»

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  • Matrix pencil method and its performance

    Publication Year: 1988, Page(s):2476 - 2479 vol.4
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (235 KB)

    A novel method called matrix pencil method for estimating poles or frequencies from exponentially damped or undamped sinusoidal sequences is presented as an alternative to either the ESPRIT or pencil-of-functions method. A singular generalized eigenvalue problem in this method is solved in several different ways. First-order perturbation analysis reveals many fundamental perturbation properties of... View full abstract»

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  • Fast algorithms in active noise or vibration control

    Publication Year: 1988, Page(s):2582 - 2585 vol.5
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (242 KB)

    Algorithms are presented for active cancellation of acoustic or mechanical fields with sinusoidal components. The first method is an efficient but not very fast algorithm using Fourier transforms. Experimental results on a multidimensional, multifrequency stationary mechanical problem are given. An adaptive algorithm is presented for cancellation of nonstationary fields with components that are kn... View full abstract»

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  • ICASSP 88: 1988 International Conference on Acoustics, Speech, and Signal Processing (Cat. No.88CH2561-9)

    Publication Year: 1988
    Request permission for commercial reuse | PDF file iconPDF (359 KB)
    Freely Available from IEEE
  • Regression surfaces for estimated reflection coefficients

    Publication Year: 1988, Page(s):2432 - 2435 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The distributions of the estimates of reflection coefficients depart considerably from normality, even using moderately long data records. As a result of this, the interdependencies among those estimates are nonlinear. The authors examine the nature of those nonlinear relationships by studying the regression surfaces of the estimated reflection coefficients, obtained using a classical nonGaussian ... View full abstract»

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  • Detection and estimation of transient signals in coloured Gaussian noise

    Publication Year: 1988, Page(s):2821 - 2824 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors present an adaptive method to detect transient signals of unknown waveform in colored Gaussian noise. The signal is modeled as the impulse response of a rational transfer function. After a prewhitening of the observed signal, the order of the rational transfer function is estimated by a method based on the covariance matrix perturbation and the coefficients by a maximum-likelihood esti... View full abstract»

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  • A new technique for speaker-independent isolated word recognition

    Publication Year: 1988, Page(s):195 - 198 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Speech recognition system using dynamic time warping are considered. It is proposed to generate a single pattern to be used as a time aligning pattern (TAP) for all the words in the system (reference and unknowns). An unknown word is time-aligned using only the TAP, and the distance between the time-aligned version and any of the reference templates (which have already been time-aligned with the t... View full abstract»

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  • A performance comparison of smoothing approaches for high-resolution active direction-finding of completely-correlated targets

    Publication Year: 1988, Page(s):2428 - 2431 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    For high-resolution active direction-finding of completely-correlated targets, one can use two approaches: the frequency-domain smoothing and the nonfrequency-domain smoothing such as spatial smoothing or multidimensional search of signal-subspace. The authors present a performance comparison of the two approaches for the fluctuating target cases under equal transmitted-energy constraints. Both th... View full abstract»

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  • Time-frequency analysis applied to signaturing of underwater acoustic signals

    Publication Year: 1988, Page(s):2817 - 2820 vol.5
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The Wigner-Ville distribution (WVD) and the cross Wigner-Ville distribution (XWVD) are applied to signal detection and classification, and signal-to-noise ratio (SNR) performance is discussed. The method is applied to signaturing the individual cylinders of a diesel engine. A comparison with the short-time Fourier transform is provided View full abstract»

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  • A connectionist approach to speech recognition using peripheral auditory modelling

    Publication Year: 1988, Page(s):699 - 702 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A prototype isolated word recogniser was constructed, with an auditory-based analysis component and a pattern classification module based on a parallel distributed processing paradigm. The auditory model used was a band-pass non-linear (BPNL) configuration which incorporates the effects of lateral suppression. Pattern classification was performed by a layered, feed-forward neural network, consisti... View full abstract»

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  • Speech recognition with high recognition rate by smoothed space pseudo Wigner-Ville distribution (SSPWD) and overlap slide window spectrum methods

    Publication Year: 1988, Page(s):191 - 194 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Smoothed-spaced pseudo Wigner-Ville distribution (SSPWD) and time overlap slide window spectrum are used to obtain a very high recognition rate for single-syllable-utterance speech recognition systems. Many modified WD spectra are defined and the reason for the high recognition rate is illustrated by examples View full abstract»

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  • Variable-rate multi-stage vector quantization for image coding

    Publication Year: 1988, Page(s):1156 - 1159 vol.2
    Cited by:  Papers (31)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A hierarchical approach to encoding of images using vector quantization (VQ) is described which allows VQ of large blocks with a tolerable computational complexity and permits progressive image reconstruction at bit rates as low as 0.3 bit/pixel. The technique used, multi-stage hierarchical VQ (MSHVQ), is a successive approximation approach for quantization that is based on recursive decomposition... View full abstract»

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  • Performance evaluation of an ARMA estimator

    Publication Year: 1988, Page(s):2424 - 2427 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The authors study the asymptotic error variance of the ARMA (autoregressive moving-average) parameters. The ARMA estimation method involves a two-step procedure: first, the AR parameters are estimated using the Burg algorithm and the time-varying components of a Kalman filter gain. Then the MA parameters are obtained using a fast identification algorithm derived from Chandrasekhar equations. The a... View full abstract»

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  • A low delay 16 kbits/sec speech coder

    Publication Year: 1988, Page(s):243 - 246 vol.1
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The authors study a speech coder using a tree code generated by a stochastic innovations tree and backward adaptive synthesis filters. The synthesis configuration uses a cascade of two all-pole filters-a pitch (long time delay) filter followed by a formant (short time delay) filter. Both filters are updated using backward adaptation. The formant predictor is updated using an adaptive lattice algor... View full abstract»

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  • Experiments on automatic classification of shallow water acoustic signal sources using two pattern recognition methods

    Publication Year: 1988, Page(s):2693 - 2696 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The problem of classifying underwater acoustic signals has been approached from a pattern recognition point of view. The signals of 25 acoustic sources were recorded from shallow-water environments, including several disturbances. The classification was performed using two statistical methods: the learning subspace method and a method based on T. Kohonen's (1981) self-organizing feature maps. In b... View full abstract»

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  • Representing sonar/radar returns as a Markov process

    Publication Year: 1988, Page(s):2813 - 2816
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The author formulates the multiple transmission application in terms of a sequential detection problem based on the likelihood ratio. The first application is for a Rayleigh fluctuating target. The likelihood ratio is constructed based on probability density functions. This gives the optimum receiver for the assumed conditions. A more general model based on Markov process is considered next. In th... View full abstract»

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  • A comparison of five 16 kbps voice coding algorithms

    Publication Year: 1988, Page(s):695 - 698 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The US Government's digital voice processor consortium measured the performance of five voice processors designed to produce high quality, high intelligibility speech at a digital transmission rate of 16 kbps. Performance was measured in terms of word intelligibility using the diagnostic rhyme test (DRT) and of voice quality using the diagnostic acceptability measure (DAM). Mean opinion scores (MO... View full abstract»

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  • New speech recognition approaches based upon finite state vector quantization with structural constraints

    Publication Year: 1988, Page(s):187 - 190 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The label-transition finite-state vector-quantization (FSVQ) algorithm is extensively explored to exhibit the power of finite-state machines for speech recognition. It is found that the FSVQ algorithm combined with special structural constraints can discriminate a finite set of candidates very successfully. All the consonant initials of isolated Mandarin monosyllables from designated speakers are ... View full abstract»

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  • Image edge detection and segmentation based on the Hilbert transform

    Publication Year: 1988, Page(s):1152 - 1155 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    An efficient edge detection model based on a two-stage procedure is presented. The first stage consists of a linear transformation of an artificially created signal that has the property of detecting step edges irrespective of the distribution of the intervals between two consecutive edges. It is demonstrated that the Hilbert transform possesses this property and also outperforms the derivative op... View full abstract»

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  • Successive correlation based Prony modeling very low SNR behavior analysis

    Publication Year: 1988, Page(s):2420 - 2423 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The efficiency of the higher-order correlation function as a means to extract sinusoids from white noise with the help of Prony modeling is studied. An improved white-noise-estimation approach is given. It is shown that it is unsatisfactory for low SNR and high order. A statistical analysis is given of the probability of success of the Prony-based modeling of the higher-order correlation. Curves a... View full abstract»

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  • An improved Toeplitz approximation method

    Publication Year: 1988, Page(s):2352 - 2355 vol.4
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors suggest a modification of the Toeplitz approximation method for estimating frequencies of multiple sinusoids from covariance measurements. The method constructs a state-feedback matrix following a low-rank approximation of the Toeplitz covariance matrix via singular-value decomposition. Ideally, the eigenvalues of this state-feedback matrix will be on the unit circle in the complex pla... View full abstract»

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  • Impact of noise and encoder/decoder mistracking on ADPCM system performance

    Publication Year: 1988, Page(s):239 - 242 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An analytic expression is derived that characterizes the distortion occurring in an adaptive differential pulse code modulation (ADPCM) system, when the system encoder and decoder mistrack, in the presence of quantization and coded channel noise. These expressions demonstrate that, when such mistracking occurs, the presence of channel and quantization noise is further accentuated by the transfer f... View full abstract»

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  • Maximum likelihood parameter estimation by simulated annealing

    Publication Year: 1988, Page(s):2741 - 2744
    Cited by:  Papers (47)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The author presents a method for finding the maximum-likelihood estimates of a set of signal parameters. The algorithm is based on simulated annealing, which is a form of stochastic optimization that has been found to be a powerful technique for solving multidimensional combinatorial optimization problems. He also presents a simulated annealing solution to a typical parameter estimation problem th... View full abstract»

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