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

Date 9-11 May 1977

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

    Publication Year: 1977, Page(s): 0
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    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»

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  • On the variance of time and frequency averages over modified periodograms

    Publication Year: 1977, Page(s):58 - 62
    Cited by:  Papers (1)
    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»

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  • 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»

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  • 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)

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  • 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)

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  • 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»

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  • A variable band coding scheme for speech encoding at 4.8 kb/s

    Publication Year: 1977, Page(s):444 - 447
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

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  • 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»

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  • 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»

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  • [Back cover]

    Publication Year: 1977, Page(s): c4
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    Freely Available from IEEE
  • Acoustic-phonetic recognition of connected speech using transient information

    Publication Year: 1977, Page(s):667 - 670
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    Acoustic-phonetic conversion is probably the most critical step in continuous speech recognition. The transitional information can be used as follows, in order to improve the results. First we contitute a lexicon of the phoneme steady-state spectra and a lexicon of all the transitions (diphones), each one being characterized by a"differential spectrum". The unknown continuous speech wave is segmen... View full abstract»

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  • A stability test for 2-D recursive digital filters using the complex cepstrum

    Publication Year: 1977, Page(s):535 - 538
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A procedure is presented for testing the stability of 2-D recursive filters. This test is based on the mapping properties of the complex cepstrum. A numerical algorithm for computing the 2-D cepstrum is described, and subsequently used in calculating numerical examples of the stability test. View full abstract»

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  • Designing near linear phase recursive filters using linear programming

    Publication Year: 1977, Page(s):88 - 92
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Previous linear programming design techniques have concentrated on magnitude only specifications, In the technique presented here we design the filter to prescribed real and imaginary components of the frequency domain specifications. Although general phase characteristics have proved difficult to achieve, good results are obtained for constant group delay designs. The technique employed is to alt... View full abstract»

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  • Algorithm for the reduction of the order of recursive digital filters

    Publication Year: 1977, Page(s):101 - 104
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Recursive digital filters of high order are necessary to provide a sharp cut-off response; the implementation of these necessarily involves high cost. This paper presents an algorithm for the design of lower order filters whose amplitude response approximates those of higher order filters. The algorithm makes use of the phase correction technique PCT 1 applied to the numerator and denominator of t... View full abstract»

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  • Polar plane blockquantization of speech signals using bit-pattern matching techniques

    Publication Year: 1977, Page(s):200 - 203
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Fourier Transformation and blockquantization offers a good tool for decorrelation and data compression of speech signals as well as for correlated random processes. Polar plane quantization versus cartesian quantization is presented and the objective and subjective performance is discussed according to the effects of introducing phase errors. The theoretical and practical limits for voiced and unv... View full abstract»

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  • Spline stochastic processes

    Publication Year: 1977, Page(s):41 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A definition of spline stochastic processes is given in this paper. We show that an interpolation of discrete stationary stochastic processes by splines does not lead to a continous stationary stochastic process. Randomization is neccessary in order to get a stationary stochastic process. Than we discuss properties of these spline stochastic processes. We relate the statistics of the discrete stoc... View full abstract»

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  • Comparison of natural speech with glottal area waveform synthetic speech

    Publication Year: 1977, Page(s):37 - 40
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    We report on an investigation of the role of the vocal cord vibratory pattern in the production of natural phonation. The naturalness of synthetic phonation, generated by exciting a vocal tract model with the glottal area waveform; was evaluated and compared to the actual phonation via a formal listener evaluation. The glottal area was measured from ultra high-speed films obtained by photographing... View full abstract»

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  • Performance of linear prediction analysis on speech with additive noise

    Publication Year: 1977, Page(s):20 - 23
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    We shall present in this paper the results of investigations on the performance of Linear Prediction (LP) analysis of speech when the signal is corrupted with additive white noise. In particular we shall discuss the effect of noise on various parameters derived from LP analysis. Theoretical justification for the observed results is given. View full abstract»

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  • Total error in signal processing due to linear detector approximation errors

    Publication Year: 1977, Page(s):859 - 863
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Several linear approximations to square root of the sum of the squares operation are well known and have been designed for implementation by digital hardware. Various papers have been written which calculate the peak, average, and mean square errors of the approximations as compared to an exact linear detector. In many radar signal processors, in-phase and quadrature moving-target-indicator residu... View full abstract»

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  • A fast microprogrammed digital filter design

    Publication Year: 1977, Page(s):523 - 526
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    In this paper the design of a fast bipolar microprocessor based digital filter bank is considered. The filter is completely microprogrammed and can be used to realize modular digital filter structures. Several steps have been taken in the design to minimize the processing time, e.g. a separate RAM address processor and a separate hardware array multiplier are included. View full abstract»

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  • Vector radix fast Fourier transform

    Publication Year: 1977, Page(s):548 - 551
    Cited by:  Papers (50)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    A new radix-2 two-dimensional direct FFT developed by Rivard is generalized in this paper to include arbitrary radices and non-square arrays. It is shown that the radix-4 version of this algorithm may require significantly fewer computations than conventional row-column transform methods. Also, the new algorithm eliminates the matrix transpose operation normally required when the array must reside... View full abstract»

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  • The AR-10 family of signal processors

    Publication Year: 1977, Page(s):490 - 493
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The AR-10 family of Signal Processors developed by Stein Associates is the culmination of over two years of intensive R&D. The processors range from a small single computing element to a large three-section multiprocessor. Among the AR-10 processor unique features are: 1) the AR/BUS, permitting large blocks of data to flow through the AR-10, never slowing down the processing rate; 2) two "styl... View full abstract»

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  • Voice programming of numerically controlled machines

    Publication Year: 1977, Page(s):452 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    Voice programming for numerical control (VNC) allows factory personnel using normal English words to speak commands needed for parts programming, thereby eliminating the need to convert the information into a computer compatible format. When using VNC, the individual verbally calls out each basic operation. The system is interactive in that each command is displayed sequentially for positive verif... View full abstract»

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  • A linear-filtering transform algorithm based on permutations

    Publication Year: 1977, Page(s):45 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (66 KB)

    An algorithm is described which computes the discrete Fourier transform using only the following operations: multiplication by a term of constant frequency; multiplication by a sequence containing only the four numbers ± 1, ± j; permutation of the sequence; convolution with a fixed impulse response; permutation of the convolved sequence, multiplication by a sequence containing only ±... View full abstract»

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