By Topic

ICASSP '77. IEEE International Conference on Acoustics, Speech, and Signal Processing

9-11 May 1977

Filter Results

Displaying Results 1 - 25 of 221
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (670 KB)
    Freely Available from IEEE
  • Inverse covariance-invariant signal processing

    Publication Year: 1977, Page(s):54 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

    Techniques are outlined for synthesizing continuous-time systems and signals which are covariance-invariant (CI) with corresponding discrete-time systems and signals. The property of covariance-invariance (CI) insures that the covariance sequence characterizing the response of a stable, linear discrete-time system to "white-noise" equals the sampled covariance function that characterizes the sampl... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the variance of time and frequency averages over modified periodograms

    Publication Year: 1977, Page(s):58 - 62
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    Expressions of a common form will be given for the variance of spectral estimators which are either time or frequency averages over modified periodograms. A modified periodogram is a generalization of the usual periodogram in which the time sample is premultiplied by a data window. Such estimates include almost all in common use and this discussion should clarify the relationships between practica... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Efficient cubic spline fit

    Publication Year: 1977, Page(s):109 - 111
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (50 KB)

    A new method is presented for fitting a cubic spline (piecewise cubic polynomial with two derivatives continuous at the joints) to a set of n equispaced data. The method exploits the eigenfunction-eigenvalue expansion of a particular sparse matrix, and determines the piecewise polynomial coefficients in2nlog_{2}noperations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Speed enhancement of digital signal processing software via microprogramming a general purpose minicomputer

    Publication Year: 1977, Page(s): 163
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10 KB)

    Summary form only given, as follows. Execution time of digital signal processing software can be substantially reduced using automatically generated code which incorporates precomputed, data independent, control and data access parameters. In this paper, further speed enhancement of such software via microprogramming of computational kernels is discussed and demonstrated. It is shown that, in addi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance evaluation of the canonical signed-digit code (CSC)

    Publication Year: 1977, Page(s):168 - 172
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    This paper discusses algorithms and performance, in terms of average number of operative symbols for shift right and shift left Canonical Signed-digit Codes [CSC] which can be applied to generation of multiplications on sequential type microprocessing machines. The reference algorithms are based on application of codes which minimize the number of operative symbols required to perform binary multi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The application of a functional perceptual model of speech to variable-rate LPC systems

    Publication Year: 1977, Page(s):219 - 222
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (137 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The creation of psycho-acoustic traditions for synthesized music

    Publication Year: 1977, Page(s):231 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microprocessor-based signal processing for the perceptually deaf

    Publication Year: 1977, Page(s):255 - 256
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (42 KB)

    A two-band compression system is being designed to improve the intelligibility of speech in noise for persons suffering from sensori-neural hearing impairment, The compressor is microprocessor based allowing variable thresholds, compression ratios above threshold, and expansion below threshold. The compressor will have significantly lower cost than commercial units based completely on analog devic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A variable band coding scheme for speech encoding at 4.8 kb/s

    Publication Year: 1977, Page(s):444 - 447
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A microprogrammable signal processor

    Publication Year: 1977, Page(s):494 - 497
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

    Digital signal processing has cone full circle from software algorithms performed on general purpose computers through special purpose, dedicated, real time processors to the programmable signal/array processor. The Programmable Number Thresher (PNTJT) is an addition to the list and its organization and features is described. The PNUT is intended primarily for the linear front end computations req... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A general realization scheme for 2-D digital transfer functions

    Publication Year: 1977, Page(s):539 - 542
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    Because of the inherent impossibility of factorizing arbitrary 2-D polynomials, all realization techniques for the general 2-D digital transfer function presented so far deal with the realization of such functions as a whole. This paper presents a new realization scheme which is based on realizing multi-input, multi-output subnetworks of multipliers and adders interconnecting 2-D digital subnetwor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A modular audio response system for computer output

    Publication Year: 1977, Page(s):579 - 582
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (89 KB)

    We describe a flexible, modular system for representation of a text-to-speech system which provides for ease of understanding, facile development, a variety of end-use systems, exportability, and ready implementation into novel technology to meet real-time needs. This system thus serves as a research base, a framework for experimentation, and the seat of structural formalisms which can imply speci... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On two or more dimensional optimum quantizers

    Publication Year: 1977, Page(s):640 - 643
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    It is hard to compute the performance of an N-level K-dimensional optimum quantizerhat{Q}_{N}directly. In this paper the performance ofhat{Q}_{N}is studied more closely from the performance of Q'N, a class of stationary quantizers. An analytical derivation of the algorithm for generating Q'Nquantizers and a computer experimental study on the performance ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1977, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (236 KB)
    Freely Available from IEEE
  • A fixed point computation of partial correlation coefficients in linear prediction

    Publication Year: 1977, Page(s):742 - 743
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    This paper introduces a new method for the computation of the partial correlation coefficients from the autocorrelation sequence. Derived from Levinson's algorithm, it involves the calculation of the crosscorrelations between the inputs and the outputs of the successive models which are formed. Using these, a fixed-point implementation is found for real time speech analysis on a 16-bits microproce... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Quantitative measurement techniques for fitting hearing instruments using selective spectrum filtering

    Publication Year: 1977, Page(s):248 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Clinical investigation has shown that significant improvements in hearing can be achieved with selective spectrum shaping using active filters. A study was conducted with 20 subjects having sensorineural losses using a matrix technique for quantitatively measuring listener performance. A master hearing instrument was used having adjustable filter responses. Test data showed that listener SDS (inte... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multichannel complex maximum entropy spectral analysis

    Publication Year: 1977, Page(s):736 - 741
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    The Burg reflection-coefficient method for maximum entropy spectral estimation is generalized to apply to multichannel complex signals. The virtues of the single-channel Burg process, particularly superior resolution and a guarantee that all power matrices are positive definite, carry over to the generalization. Results of some numerical computations are presented in graphical form. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An innovative approach to measurements of vocal changes following sudden onset complete hearing loss

    Publication Year: 1977, Page(s):240 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    Following sudden profound bilateral hearing loss in a 14 year old child, vocal changes were recorded and subjected to a multi-dimensional analysis. Parameters investigated included total speaking time, rate, phonation time, pause time, vocal pitch, pitch range, harmonic distribution, and intensity measures. The method of measurement which was employed is proposed for serving as a basis for the qua... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Subjective effects of phase delay on synthesized speech

    Publication Year: 1977, Page(s):587 - 590
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    The contents of this paper describes the results of a study to determine the subjective effects of phase delay on synthesized speech. It is well known that synthesized speech is generally associated with a "machine-like" quality. Previously performed work in the speech processing field has shown that phase differentials over the speech spectrum in some cases improve the speech quality. However, no... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computation of the complex cepstrum by factorization of the z-transform

    Publication Year: 1977, Page(s):723 - 726
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (86 KB)

    We compute the complex cepstrum of a finite duration slgnal by completely factoring its z-transform and summing the easily obtained complex cepstra of the factors. The method requires no phase unwrapping and introduces no aliasing. The only approximation is the unavoidable finite time window. Thus the factorization method provides a means for evaluating other methods for computing the complex ceps... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Vowel pre-processing with a neurally based model

    Publication Year: 1977, Page(s):265 - 269
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    We assume that (1) nervous system activity is most usefully represented as the set of simultaneous individual neuron activities in a group of neurons, (2) different memory traces make use of the same synapses and (3) synapses associate two patterns of neural activity by incrementing synaptic connectivity proportional to the product of pre- and post-synaptic activity (a Hebbian rule). We extend thi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A two-mass model of the vocal cords: Determination of control parameters and their respective consequences

    Publication Year: 1977, Page(s):583 - 586
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A two-mass model of the vocal cords is controlled by physiological control parameters : subglottal pressure, mass and stiffness of the vocal cords. Their values, specified in the frame of this study, are investigated by an indirect method and a statistical proceeding. Several kinds of models are considered. Each of them can give, with different stiffness, a right shape corresponding to the volume ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Advanced acoustic techniques in automatic speech understanding

    Publication Year: 1977, Page(s):663 - 666
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The BBN Speech Understanding System (HWIM) has two ways by which it may access the acoustic data of an unknown utterance. The first is an Acoustic-Phonetic Recognition component which derives a bottom-up phonetic transcription of the utterance. New techniques in probabilistic modeling of multi-dimensional density distributions have allowed many acoustic features to be fully utilized. HWIM (for Hea... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recursive autocorrelation computation for LPC analysis

    Publication Year: 1977, Page(s):1 - 4
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    A method for recursively calculating the autocorrelation functions for LPC analysis in a vocoder environment is developed theoretically and studied experimentally. The method has three specific advantages: (1) it requires very little memory for its implementation; (2) it is realized by a structure consisting of several identical modules; and (3) the effective window length may be changed without v... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.