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Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '80.

Date 9-11 April 1980

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Displaying Results 1 - 25 of 258
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Signal processing and complexity of computation

    Publication Year: 1980, Page(s):94 - 101
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (258 KB)

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  • Moving image restoration and registration

    Publication Year: 1980, Page(s):418 - 421
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    A new method for moving image restoration and registration is established. The observations are sequences of low-resolution, possibly undersampled, discrete frames. The result is a restored high-resolution image. The restoration part is attractive for the purpose of real time implementation since the computation consists of only a few complex operations per pel of the resultant high resolution ima... View full abstract»

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  • A phonetic dictionary for demisyllabic speech synthesis

    Publication Year: 1980, Page(s):565 - 567
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (77 KB)

    Demisyllables and affixes (1,2,3) have been found to be very promising units for concatenative speech synthesis View full abstract»

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  • [Back cover]

    Publication Year: 1980, Page(s): c4
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    Freely Available from IEEE
  • A dynamic programming approach to variable rate speech transmission

    Publication Year: 1980, Page(s):28 - 31
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    For many sounds, the successive frames of a speech signal do not differ significantly, and they can be represented by the same set of parameters (PARCOR coefficients). This paper examines the possibility of transmitting only some of the new parameters and replacing the rest by the parameters already transmitted. Several frames are considered, and all the possible decision sequences (paths) are exa... View full abstract»

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  • Experiments in syllable-based recognition of continuous speech

    Publication Year: 1980, Page(s):880 - 883
    Cited by:  Papers (37)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    An exploratory implementation of a syllable-based recognizer is described. Continuous speech is first divided into syllabic units, and the units are then matched against syllable templates using a dynamic programming algorithm. A hierarchical transition network is used to limit the syllable search to possible continuations of the current partial sentence hypotheses. Competing hypotheses are pruned... View full abstract»

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  • A novel innovation based time domain pitch detector

    Publication Year: 1980, Page(s):40 - 44
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    We present a novel innovations based time-domain pitch detection technique for speech-like signals using one of our recursive least-squares ladder algorithms. The basic assumption is that the speech driving process consists of an approximately Gaussian part (unvoiced) and a jump part (voiced). The pitch pulse positions located by processing the innovations alone are known not to be very accurate d... View full abstract»

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  • A conversational mode airline information and reservation system using speech input and output

    Publication Year: 1980, Page(s):203 - 208
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    We describe a conversational mode speech understanding system which enables its user to make airline reservations and obtain timetable information through a spoken dialog. The system is structured as a three level hierarchy consisting of an acoustic word recognizer, a syntax analyzer and a semantic processor. The semantic level controls an audio response system making two way speech communication ... View full abstract»

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  • Singular value decomposition of 2-D impulse responses

    Publication Year: 1980, Page(s):749 - 752
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The Singular Value Decomposition of impulse responses of 2-D FIR filters allows to consider these filters as a sum of 2-D separable filters. This property is used to solve two important problems. First the design of variable cut-off 2-D filters is studied. Second, the implementation of 2-D filters with fixed-point arithmetic is investigated. Experimental results in the field of image processing ar... View full abstract»

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  • SIPROL: A high level language for digital signal processing

    Publication Year: 1980, Page(s):1056 - 1059
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    This paper presents the design ideas for a high level signal processing language. The design objectives for the signal processing language SIPROL are adaptation to the problem domain, portability and code efficiency. SIPROL is derived from PASCAL and comprises abstraction as the most significant extension. The problem of signal processing requirements is discussed and the main language issues are ... View full abstract»

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  • Two-dimensional prediction of area functions for coding of LPC speech parameters

    Publication Year: 1980, Page(s):11 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    In this study, predictive coding of area functions for data rate reduction of LPC coded speech is examined. The properties of several predictors are described, and the benefit obtained from use of the mutual information among the areas is assessed. Coding methods examined include differential coding and two-dinmensional prediction. This experimental study uses an objective speech quality measure t... View full abstract»

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  • Four outdoor classical music sound reinforcement systems compared

    Publication Year: 1980, Page(s):682 - 685
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Given the common goals of even coverage, sufficient loudness, naturalness, wide frequency response, good instrumental and tonal balance, and generally pleasing sound, that are common to all outdoor classical music sound systems, the actual design of the individual systems will vary, depending on the size of the audience, background noise conditions encountered, topography of the site, and any requ... View full abstract»

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  • A stable family of adaptive IIR filters

    Publication Year: 1980, Page(s):1001 - 1004
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    This paper unifies a rapidly growing area of inquiry: adaptive infinite impulse response (IIR) filter development and evaluation. A class of stably convergent adaptive IIR filters has evolved from a proven adaptive IIR filter with an auto-regressive, moving-average (ARMA) structure. The convergence proof was originally based on a hyperstability evaluation of an identification format. This paper re... View full abstract»

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  • A rapidly converging algorithm for adaptive beam forming

    Publication Year: 1980, Page(s):1052 - 1055
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A new formulation of the adaptive beam forming processor is provided that facilitates the application of Kalman filtering algorithm. The problem formulation is such that it does not require apriori knowledge about the signal or the interference. Only the signal look direction needs to be specified. The resulting algorithm is capable of faster convergence then some other algorithms reported. View full abstract»

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  • Confidence bounds for signal-to-noise ratios from magnitude-squared coherence estimates

    Publication Year: 1980, Page(s):650 - 653
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    Coherence is used frequently to determine the degree to which one observed voltage is related to another observed voltage. Typically, in practice, these observables are degraded by system noise that is often independent, white, and Gaussian. Often, in measuring coherence, the interest is to determine the fraction of the observed power that is due to coherent signals and the fraction that is due to... View full abstract»

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  • Dynamic beamforming of a random acoustic array

    Publication Year: 1980, Page(s):311 - 314
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Design trade-offs in a programmable time-delay-and-sum digital beamformer built by MPL will be discussed. This dynamic beam-former permits the incorporation of slow changes in element positions and/or beam steering direction while the beamformer carries out the real-time formation of 1300 beams from 32 input sensors. The sensors are distributed in a random but known manner over an aperture diamete... View full abstract»

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  • Near optimal frequency/Angle of arrival estimates based on maximum entropy spectral techniques

    Publication Year: 1980, Page(s):829 - 832
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    The problem of estimating the parameters of sinusoids corrupted by additive noise arises both in time series analysis and array processing. The performance of a certain type of maximum entropy spectral estimator based on a modified covariance method of linear prediction has been studied analytically in the high signal-to-noise region. The peak positions in the spectral estimate have been shown to ... View full abstract»

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  • Optimal noise shaping in adaptive predictive coding of speech

    Publication Year: 1980, Page(s):539 - 542
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    Spectral shaping of quantizing noise is an important issue for achieving "transparent" speech quality with low bit rate wave-form coding. To obtain optimum quality in an Adaptive Predictive Coder with Noise Feedback (APC-NF), we have defined a class of functional forms for the noise spectrum, controlled by three parameters, that could span as completely as possible the space of reasonable shapes i... View full abstract»

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  • Application of the optimal control theory to the deconvolution problem

    Publication Year: 1980, Page(s):947 - 949
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (55 KB)

    The problem of the deconvolution of two signals combined by convolution is often encountered in signal processing and therefore the deconvolution is largely treated in litterature, but most of the authors deals with the stationary case. we discuss here a method based on the optimal control theory which is applicable unaltered in the stationary or non-stationary case. View full abstract»

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  • "Return to forever": A touring sound system for concert halls

    Publication Year: 1980, Page(s):690 - 691
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (28 KB)

    In 1974 and 1975 the quartet, "Return to Forever," toured North America and Europe, playing to concert hall audiences. Highly complex and highly amplified, the quartet required a sound system capable of playing a variety of acoustic environments. Rose City Sound, of Portland, Oregon, provided a system, which, in addition to projecting to the house, afforded each musician a separate "monitor mix." ... View full abstract»

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  • Reduction of broadband noise in speech by spectral weighting

    Publication Year: 1980, Page(s):1045 - 1051
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    This paper describes a general approach for reducing the level of broadband noise in speech. The method is derived by considering the probability density functions of the complex spectrum parameters corrupted by additive noise. This leads to a general formulatian of the problem and a class of speech spectral estimators is introduced, which include spectral subtraction as a special case. An optimum... View full abstract»

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  • Tracking properties of adaptive signal processing algorithms

    Publication Year: 1980, Page(s):466 - 469
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Adaptive signal processing algorithms are often used in order to "track" an unknown time-varying parameter vector. Such algorithms are typically some form of stochastic gradient-descent algorithm. The Widrow LMS algorithm is apparently the most frequently used. This work develops an upper bound on the norm-squared error between the parameter vector being tracked and the value obtained by the algor... View full abstract»

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  • Detection of partitioned signals by discrete cross-spectrum analysis

    Publication Year: 1980, Page(s):638 - 641
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    Partitioning of the observation space using quantiles of the underlying noise distribution is a useful technique to achieve distribution-free performance. A set of quantiles and related functions essentially determine a nonlinearity which depends on the underlying noise and precedes the standard detector. In this paper, the received data in each channel of the array is first partitioned by a set o... View full abstract»

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  • Improvement of delay measurements from sonar arrays via sequential state estimation

    Publication Year: 1980, Page(s):804 - 806
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (67 KB)

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