ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing

7-11 April 1986

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Displaying Results 1 - 25 of 786
  • Proceedings ICASSP '86. IEEE-IECJ-ASJ International Conference on Acoustics, Speech, and Signal Processing [front matter]

    Publication Year: 1986
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    Freely Available from IEEE
  • Markov modeling of continuous parameters in speech recognition

    Publication Year: 1986, Page(s):45 - 48
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (123 KB)

    This paper presents how to avoid the labelling part of a speech recognition strategy based on hidden Markov models, while keeping a stochastic formulation. After a brief recall of how a Markov model can be used for speech recognition, we propose another formulation, in which the labels are suppressed, dealing only with continuous parameters. The notion of speech generator is then introduced, and t... View full abstract»

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  • Estimation of frequencies of sinusoids in colored noise

    Publication Year: 1986, Page(s):177 - 180
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    This paper is concerned with the estimation of frequencies of sinusoids based on the data disturbed by colored noise. The noise is assumed to be an MA process and the bias compensated least squares (BCLS) algorithm is derived for estimating the coefficients of the linear difference equation for the sum of sinusoids. For the white noise case, the algorithm is closely related to the well-known Pisar... View full abstract»

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  • A fast codebook search algorithm for nearest-neighbor pattern matching

    Publication Year: 1986, Page(s):265 - 268
    Cited by:  Papers (47)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (101 KB)

    A critical issue in the use of Vector Quantization is to circumvent the complexity bottleneck that prevents the full power of this data compression technique from being exploited. The demanding exhaustive codebook search can be avoided by more efficient algorithms for locating the nearest codevector in a codebook to a given input vector. This paper introduces a fast nearest neighbor search algorit... View full abstract»

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  • Optical circuitry and architectures for digital optical computing

    Publication Year: 1986, Page(s):477 - 480
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (35 KB)

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  • Optical signal processors consisting of collinear acousto-optic channel waveguides

    Publication Year: 1986, Page(s):489 - 492
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

    Optical signal processors consisting of optical switches using collinear acous-to-optic (A-O) interaction are proposed. Several optical signals with different wavelength are switched independently to each other at the same time. High A-O interaction efficiency is realized because both optical and acoustic waves are confined in channel waveguides. Wavelength-selective switching was demonstrated in ... View full abstract»

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  • Floating point error analysis of recursive least squares and least means squares adaptive filters

    Publication Year: 1986, Page(s):513 - 516
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (102 KB)

    A floating point error analysis of the Recursive Least Squares and Least Mean Squares (LMS) algorithms is presented. Both the prewindowed growing memory RLS algorithm (λ=1) for stationary systems and the exponential sliding window RLS algorithm (λ < 1) for time varying systems are studied. For both algorithms the expression for the mean square prediction error and the expected value o... View full abstract»

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  • Refutation based recognition to help vowel articulation

    Publication Year: 1986, Page(s):645 - 648
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    Between speech training and speech recognition, we provide speech teachers with an innovative tool for teaching deaf children how to master the articulation of voiced sounds. Two theoretical aspects of this work are important :bulletPhonemes are seen as elements of an organized structurebulletThe phonetic recognition is based on rejection principles The following developments... View full abstract»

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  • Japanese speech synthesis system in a book reader for the blind

    Publication Year: 1986, Page(s):661 - 664
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB)

    This paper describes a Japanese speech synthesis system in a book reader for the blind and its performance evaluation results. A prototype book reader, which reads Japanese language books, has been developed. The speech synthesis system for this book reader is based on speech synthesis by rule using formant synthesis and diphone like segment compilation method. This system is small and inexpensive... View full abstract»

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  • A real-time ADPCM encoder using variable order prediction

    Publication Year: 1986, Page(s):825 - 828
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    The compression of digitally encoded speech in real-time is of interest to those working on voice transmission and storage systems. This paper evaluates the application of a variable order predictor to Adaptive Differential Pulse Code Modulation (ADPCM) to lower the bit rate without mitigating the speech quality. The technique encodes the speech waveform by using a lattice prediction filter to pre... View full abstract»

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  • Acoustical transformation technique as a practical tool

    Publication Year: 1986, Page(s):905 - 907
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    The STSF method (Spatial Transformation of Sound Fields) is extremely versatile in the way that any acoustical parameter (pressure, velocity or intensity) can be estimated in the half space in from of the noise object. This allows simulation of attenuation of noise sources on the surface of the noise object, and the effect in the far field can be estimated. View full abstract»

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  • An adaptive state-prediction digital facsimile coding technique

    Publication Year: 1986, Page(s):1013 - 1016
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    This paper presents an adaptive state-prediction facsimile coding technique. It is based on the third-order Markovian state prediction coding and the Chinese characterast-pattern. By detecting the particular state-pair along the right and left inclined strokes the predictor state will be changed adaptively. Then we can get more accurate predictions and bigger data compression ratio. View full abstract»

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  • Duality theory of composite sinusoidal modeling and linear prediction

    Publication Year: 1986, Page(s):1261 - 1264
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (163 KB)

    This paper reveals that an elegant duality exists between Linear Prediction (LPC) and Composite Sinusoidal Modeling (CSM) from the viewpoint of orthogonal polynomial theory. Both LPC and CSM are formulated as orthogonal polynomial theory with variablesz = e^{jomega}(LPC) andx = cosomega(CSM) where the "inner product" is defined by the integral of a pair of functions of freque... View full abstract»

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  • Optimal speech data reduction using a stochastic realization algorithm

    Publication Year: 1986, Page(s):1265 - 1268
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (99 KB)

    The paper discusses some results of application of a stochastic realization algorithm for developing an ARMA type predictor for a class of speech signals. It is shown that a minimal order adaptive predictor can be obtained for the given speech data using a finite window version of the realization algorithm. The utility of the predictor is first established by processing synthetic signals generated... View full abstract»

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  • A new adaptive summing technique for audio teleconferencing

    Publication Year: 1986, Page(s):1325 - 1328
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    Simultaneous speech from two test subjects were used as the source data to test the effectiveness of a proposed algorithm. The audio results indicate that, as predicted, the direct summation of μ-law and adaptive PCM signals creates severe distortion. When an adaptive voice summing technique was applied, the distortion was dramatically decreased. Our results show that the resultant intelli... View full abstract»

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  • Maximum-entropy spectrum from a non-extendable autocorrelation function

    Publication Year: 1986, Page(s):1377 - 1379
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (71 KB)

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  • "Fast maximum likelihood joint estimation of frequency and frequency rate"

    Publication Year: 1986, Page(s):1409 - 1412
    Cited by:  Papers (36)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (119 KB)

    A Fast Maximum Likelihood Algorithm for the Joint estimation of the Frequency and Frequency rate of a sinusoid in Gaussian white noise is presented here. The novelty of this algorithm is the use of Newton's method for finding the zero of a function to determine the maximum of the log-likelihood function. The rate of convergence of Newton's method is extremely fast. Simulation of the algorithm show... View full abstract»

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  • Edge detection using zero crossings of directional derivatives of a random field model

    Publication Year: 1986, Page(s):1465 - 1468
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    An edge detector using the first and second directional derivatives of a random field model is described. The method consists of representing the pixels in a window by a 2 - D causal autoregressive (AR) model, whose parameters are adaptively estimated using a Kalman filter. Due to the modelling assumption, the directional derivates are functions of AR parameter estimates. An edge is detected if th... View full abstract»

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  • An iterative method for restoring noisy images

    Publication Year: 1986, Page(s):1481 - 1484
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (103 KB)

    A new iterative image restoration method is presented which incorporates a priori knowledge concerning the image and noise statistics directly in the iterative procedure. The iterative algorithm is computationally efficient in that only a small number of computations per pixel are required and appears to exhibit neither high noise sensitivity nor significant loss of resolution. It is demonstrated ... View full abstract»

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  • Karhunen-Loeve transform-based fast algorithms for image restoration

    Publication Year: 1986, Page(s):1493 - 1496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (138 KB)

    In this work, we study restoration of digital images degraded by white and colored noise using the Wiener filtering technique. It has been established that the Karhunen-Loeve transform (KLT) of the covariance matrix of a first order Markov process can be closely approximated by the discrete cosine transform (DCT) [1]. This property is used to establish that the Wiener filtering equations for an (n... View full abstract»

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  • A wafer scale DTW multiprocessor

    Publication Year: 1986, Page(s):1557 - 1560
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (117 KB)

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  • A continuous parameter and frequency domain based Markov model

    Publication Year: 1986, Page(s):1597 - 1600
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    In most of the existing Automatic Speech Recognition Systems which make use of Markov Models, the output of the Markov Chain are strings whose symbols belong to a finite alphabet and are generated sequentially over the time domain. We propose a Markov Model System in which symbols are substituted by Spectral Lines which are sequentially generated over the frequency domain. Each spectral line is re... View full abstract»

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  • Analysis, synthesis and perception of the French nasal vowels

    Publication Year: 1986, Page(s):1601 - 1604
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    The purpose of the research reported here was to find out some acoustical and perceptual characteristics of the French nasal vowels. Acoustic analysis was made using a Pole-Zero Analysis-by-Synthesis procedure : below 4 kHz (in the case of male adult informants) the main acoustic correlates of the nasal vowels are the formant shifts and the introduction of two pole-zero pairs, one below F1, the ot... View full abstract»

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  • Fundamental limits on multiple PRF radar performance

    Publication Year: 1986, Page(s):1943 - 1946
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    The product of the unambiguous range and doppler bandwidth of a multiple PRF radar is equal to:R_{max} cdot BW_{max} = frac{c}{2} frac{lcm of PRF's}{gcd of PRF's}While this number can be increased without limit by suitable choices of the PRF's, the probability of error in resolution of ambiguity will in general increase with it, although not monotonically. In the paper new results are d... View full abstract»

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  • Multi-scale edge detection with Gaussian filters

    Publication Year: 1986, Page(s):2047 - 2050
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The article gives a possible solution to an open problem of how to effectively combine the different scales of analysis at the early visual information processing level. View full abstract»

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