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ICASSP '78. IEEE International Conference on Acoustics, Speech, and Signal Processing

10-12 April 1978

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Displaying Results 1 - 25 of 210
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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  • New stochastic realization algorithms for identification of ARMA models

    Publication Year: 1978, Page(s):208 - 213
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (155 KB)

    Autoregressive moving-average (ARMA) models are of great interest in speech processing. This paper presents new stochastic realization algorithms for identification of such models, by use of a special canonical filter form in the state space, directly and simply connected with ARMA models. We take advantage of certain matrix properties to develop algorithms, which eliminate a matrix inversion, usi... View full abstract»

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  • Design considerations for feedback amplifiers

    Publication Year: 1978, Page(s):252 - 254
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    Circuit design concepts for negative feedback amplifiers are discussed. Preferred circuit architecture for the minimization of transient and static distortions is presented. A discussion of the application of these concepts to audio power amplifiers and phonograph preamplifiers is given. View full abstract»

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  • Computer analysis of transient distortion and low transient distortion amplifier design

    Publication Year: 1978, Page(s):267 - 269
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (57 KB)

    First Page of the Article
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  • High resolution spectral analysis of sinusoids in correlated noise

    Publication Year: 1978, Page(s):349 - 351
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    A high resolution technique for estimating the frequencies, powers, and the number of sinusoids in noise is examined. Unlike the Pisarenko decomposition method which may only be applied to sinusoids in uncorrelated noise, the technique examined in this paper may be applied even when the noise is correlated. This technique consists of applying Prony's algorithm to a segment of the autocorrelation f... View full abstract»

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  • An error formula for iterative prefiltering frequency estimates

    Publication Year: 1978, Page(s):369 - 371
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  • Digital filters with prescribed zeros

    Publication Year: 1978, Page(s):487 - 490
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (68 KB)

    We discuss the design of digital filters with maximally flat or equiripple passband behavior and transfer functions of the formH(z)= K frac{(z+1)^{q}Pimin{i=1}max{r}(z-e^{jomega_{i}})(z-e^{-jomega_{i}})}{D_{n}(z)}, where q+2r, the number of finite-plane zeros, is allowed to vary from 0 to n, the filter order. Analytic expressions are given for the magnitude squared function. Identificat... View full abstract»

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  • A phoneme recognition system based on human audition

    Publication Year: 1978, Page(s):557 - 560
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (169 KB)

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  • Signal processing with number theoretic transforms and limited word lengths

    Publication Year: 1978, Page(s):619 - 623
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (85 KB)

    Number Theoretic Transforms (NTT's), unlike the Discrete Fourier Transform (DFT), are defined in finite rings and fields rather than in the field of complex numbers. Some NTT's have a transform structure like the Fast Fourier Transform (FFT) and can be used for fast digital signal processing. The computational effort and the signal-to-noise ratio (SNR) performance of linear filtering in finite rin... View full abstract»

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  • Number theoretic transforms with modulus 22q- 2q+ 1

    Publication Year: 1978, Page(s):624 - 627
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (87 KB)

    Number theoretic transforms using the modulus2^{2_{q}} - 2^{q} + 1, which require no multiplications, are introduced. These transforms have 50% greater sequence lengths for a given wordlength than Fermat transforms, and there is greater flexibility in the choice of wordlength. Furthermore, arithmetic modulo2^{2_{q}} - 2^{q} + 1is not significantly more complex than arithmetic... View full abstract»

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  • Real-factor FFT algorithms

    Publication Year: 1978, Page(s):634 - 637
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB)

    The FFT algorithms are described which, like those described by Rader and Brenner, use pure real (or imaginary) constant factors. Since these factors containcos(2pik/N)(orsin(2pik/N)), these processes are somewhat better conditioned than those of Rader/Brenner, and are comparably efficient. View full abstract»

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  • An algorithm for testing stability of two-dimensional digital recursive filters

    Publication Year: 1978, Page(s):769 - 772
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    The Principle of the Argument is applied to test the stability of a 2-D recursive filter with denominator B(Z1,Z2). This approach to stability testing leads to an efficient numerical implementation requiring only the computation of a 2-D DFT, followed by phase unwrapping and a search for zeros ofB(e^{jomega_{1}},e^{jomega_{2}}). In the absence of zeros ofB(e^{... View full abstract»

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  • On an extension of A. N. Krylov's numerical method for determining the frequencies of small vibrations of systems with damping

    Publication Year: 1978, Page(s):846 - 847
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (22 KB)

    In many engineering problems we must find the roots of an equation of the formdet B(lambda)=0where B(λ) is a nonlinear matrix of λ. In this paper we show how this problem may be reduced to integrating a system of ordinary differential equations subject to known initial conditions. The method covers also the case of complex roots. It gives directly the roots i: without the need... View full abstract»

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  • [Back cover]

    Publication Year: 1978, Page(s): c4
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    Freely Available from IEEE
  • A programmable sonar signal processor

    Publication Year: 1978, Page(s):237 - 240
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    A 36-channel digital sonar processor has been designed and constructed based on computer simulation results. For CW pulse operation, 16 stored doppler replicas in ROM units are used for correlation with the received signal. For FM pulse operation, a hard limited replica stored in a ROM is used to correlate with this received signal. The advantage of processing the signals in this way is that the r... View full abstract»

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  • High resolution autoregressive spectrum analysis using noise power cancellation

    Publication Year: 1978, Page(s):345 - 348
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Autoregressive spectrum analysis, alternately known as maximum entropy spectrum analysis, has received much attention as a higher resolution alternative to conventional spectra computed using the modulus of the FFT. This paper examines the relationship of the autoregressive spectrum analysis technique to the Prony and Pisarenko spectral decomposition techniques. The Prony method yields a new signa... View full abstract»

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  • A multiplexing scheme for multirate digital filtering with half-band filters

    Publication Year: 1978, Page(s):504 - 507
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    The multiplexing scheme presented here applies to multirate filtering with half-band FIR filters which must be implemented with the help of a single multiplier. It consists of interleaving the data samples of the filter stages, according to the binary rate multiplier principle. For the realization of the stages, the transposed direct form is retained with serial processing of the data. No extra bu... View full abstract»

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  • Frequency estimation by linear prediction

    Publication Year: 1978, Page(s):352 - 356
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The application of linear prediction to frequency estimation for sinusoidal signals in noise is investigated. It is shown that improved performance is obtained by processing a complex-valued version of the real-valued input signal, with the corresponsing sampling rate reduced by one-half. The case of a single sinusoid in white noise is studied in detail, including the eigenvalues of the covariance... View full abstract»

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  • JPL 220Channel 300 MHz bandwidth digital spectrum analyzer

    Publication Year: 1978, Page(s):808 - 811
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (67 KB)

    A million (2020) channel, 300 MHz bandwidth, digital spectrum analyzer is being constructed at the Jet Propulsion Laboratory (JPL). The design, fabrication, and maintenance philosophy of the modular, pipelined, Fast Fourier Transform hard-ware are described. The spectrum analyzer will be used to examine the region from 1.4 GHz to 26 GHz for Radio Frequency Interference (RFI) which may b... View full abstract»

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  • An excitation function for LPC synthesis which retains the human Glottal phase characteristics

    Publication Year: 1978, Page(s):171 - 174
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    An excitation function for LPC synthesis is constructed from a best estimate of the glottal volume velocity waveform. By proper smoothing, inverse filtering, and truncation, the phase characteristics of the glottal wave are preserved, while the basic requirement of an essentially flat spectrum is also satisfied. The new function is suggested as an excitation for reducing the buzzy quality often pe... View full abstract»

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  • Studies on pattern recognition approach to voiced-unvoiced-silence classification

    Publication Year: 1978, Page(s):1 - 4
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    A pattern recognition approach for deciding whether a given segment of speech should be classified as voiced speech, unvoiced speech or silence based on a set of five measurements of the signal is given by Atal and Rabiner [1]. In this paper, we demonstrate that it is possible to achieve this classification with much less computational effort. These computational savings are mainly achieved by ado... View full abstract»

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  • Reconnaissance sonar for deep ocean seamount detection

    Publication Year: 1978, Page(s):241 - 244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    A system design concept for deep ocean seamount detection at athwartship ranges to 16 km is presented. The calculation of required sonar parameters is based on actual measurement of seamount backscatter levels, employing a non-linear acoustics source wlth similar beamwidth and frequency. Shadow zones limit the system's ability to distinguish between seamounts and abyssal hills. Consequently the ma... View full abstract»

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  • Techniques for residue-to-analog conversion for high data rate digital filtering

    Publication Year: 1978, Page(s):804 - 807
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    This paper presents two approaches to the design of residue-to-analog converters to be used with residue number digital filters. The first approach, based on the associated mixed radix number system, is effective when it is desired to translate the residue samples directly into analog form. The second approach, based on the Chinese Remainder Theorem, is a more direct method for translating from re... View full abstract»

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  • Super directive spectrum analyzer by use of moving microphones

    Publication Year: 1978, Page(s):824 - 827
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    This paper describes a new method of estimating spectrum of incident sound from a specified direction. A fixed microphone and a moving microphone form a basic composition. The moving microphone moves along a straight line from the fixed one to the specified direction. After giving the time delay to the output of the moving microphone according to the distance between two microphones,the cross spec... View full abstract»

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  • Implementation of a channel vocoder synthesizer using a fast, time-multiplexed digital filter

    Publication Year: 1978, Page(s):167 - 170
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    This report describes the implementation of a 19-channel vocoder synthesizer, with a computer driven digital filter. The digital filter is a special purpose digital processor, which produces the transfer function of a second order section, with two poles and two zeros. Since up to 128 indipendent filter calculations can be completed during one sampling interval of the resulting speech wave, it can... View full abstract»

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