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ICASSP '81. IEEE International Conference on Acoustics, Speech, and Signal Processing

March 30 1981-April 1 1981

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Displaying Results 1 - 25 of 296
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Constrained algorithms for multi input adaptive lattices in array processing

    Publication Year: 1981, Page(s):297 - 301
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (102 KB)

    This paper is concerned with problems of enhancing the look-direction signal in the presence of spatially distributed interference sources and sensor noise, when a multi channel processor is employed subject to the constraint that it has a desired frequency response for look-direction signals. The multi-channel algorithms to be presented possess stage by stage decoupling and do not involve an arbi... View full abstract»

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  • Multifactor algorithms for noncyclic digital convolution

    Publication Year: 1981, Page(s):310 - 314
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    The computation of the (noncyclic) convolution of two sequences occurs in a variety of digital signal processing applications, e.g., correlation and linear filtering. Direct evaluation involving sequences of length N requires N multiplications and (N-1)2additions. A std. approach for large N uses the FFT to reduce the number of computations. This requires that one append a guard band of... View full abstract»

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  • Adaptive ARMA spectral estimation

    Publication Year: 1981, Page(s):475 - 479
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    A novel adaptive method for efficiently obtaining an ARMA model spectral estimate of a wide-sense stationary time series is presented. It is adaptive in the sense that as a new element of the time series is observed, the coefficients of a (p,p)th order ARMA model may be algorithmically updated. This algorithm's computational complexity (i.e., the number of multiplications and additions required) i... View full abstract»

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  • Architecture for a digital programmable image processing element

    Publication Year: 1981, Page(s):658 - 661
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    A very high speed integrated circuit is required to perform a 3-pixel-by-3-pixel sliding window convolution over an image. To perform this on real-time video requires on the order offrac{9 mult}{pixel} times frac{512^{2} pixels}{frame}or 71 × 106multiplies/sec. A device has been designed to perform 90 × 106multiply-accumulate operations/sec. using 8-bit i... View full abstract»

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  • An l2-stability theorem for multidimensional IIR digital filters

    Publication Year: 1981, Page(s):716 - 719
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (77 KB)

    The evaluation of the quantization error in two-dimensional (2-D) digital filters involves the following computationJ = Sigmamin{m=0}max{infin} Sigmamin{n=0}max{infin} y^{2}(m,n)In this paper a theorem concerning l2-stability is given and a general method for the evaluation of J based on a Laurent expansion of the integrand is presented. An illustrative example is given. View full abstract»

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  • Digital simulation of loudspeaker systems

    Publication Year: 1981, Page(s):782 - 785
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    The signal flow graph for the vented box woofer with voice coil inductance is used to obtain the matrix differential equation. The computing algorithm for finding the steady state sinusoidal response is given. The simulation program is written in BASIC for time shared computation. The simulation is well verified by application to a 10 inch woofer in an 80 liter vented box. View full abstract»

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  • Computer simulation studies of a simplified model for a certain class of autoregressive systems

    Publication Year: 1981, Page(s):869 - 872
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    An autoregressive (AR) systemx{n} = Sigmamin{i=1}max{M} a_{i}(n) x(n-i) + A(n) w(n)where{a_{i}(n)}, and A(n) are general stationary stochastic processes and w(n) is white noise, is well modeled by a similar equation in which the random processes are replaced by their averages, if the resulting constant coefficient model is sufficiently lowpass, low gain (LPLG) [1]. By compute... View full abstract»

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  • A time-recursive lattice algorithm for autoregressive estimation

    Publication Year: 1981, Page(s):873 - 876
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    A time-recursive least-squares lattice estimation algorithm is presented. The reflection coefficients, kj, are estimated from residual energy estimates,hat{RE}_{j}, so that|hat{k}_{j}| < 1for all j. Thus the stability of the inverse filter is guaranteed. Computation and storage may be reduced by normalizing the forward and backward prediction errors throughout t... View full abstract»

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  • A new recursive method for identification of multivariate linear systems from impulse response and output covariance information

    Publication Year: 1981, Page(s):890 - 893
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (102 KB)

    A new recursive method is proposed for fitting multivariate ARX models and testing their stability from impulse response and output covariance information. This recursive algorithm, differing from that of Mullis and Roberts, consists of two types of recurrences, one of which is related to updating AR orders and the other to updating MA orders. It offers more computational convenience especially in... View full abstract»

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  • An evaluation of hierarchical features in speech recognition

    Publication Year: 1981, Page(s):979 - 982
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    First Page of the Article
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  • Improving LPC analysis of noisy speech by autocorrelation subtraction method

    Publication Year: 1981, Page(s):1082 - 1085
    Cited by:  Papers (6)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (111 KB)

    A robust linear predictive coding (LPC) method that can be used in noisy as well as quiet environment has been studied. In this method, noise autocorrelation coefficients are first obtained and updated during non-speech periods. Then, the effect of additive noise in the input speech is removed by subtracting values of the noise autocorrelation coefficients from those of autocorrelation coefficient... View full abstract»

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  • Application of fuzzy set theory in detecting x-ray edges

    Publication Year: 1981, Page(s):1125 - 1128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    An algorithm for extracting different regional boundaries of x-ray images is described which includes three-stage enhancement of the image in the fuzzy property plane and a smoother before the detection of edges. The property plane is extracted from the spatial domain using S and π functions and fuzzifiers. The operator 'contrast intensifier' is used as an enhancement tool. The final edge det... View full abstract»

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  • Multiplicative linear phase FIR filters

    Publication Year: 1981, Page(s):1201 - 1204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    A linear phase MFIR realization of a desired frequency response magnitude|H_{d}|is shown to requireO(n log_{2}N)multipliers and adders, where N is the order of the minmax FIR design of|H_{d}|and n of the IIR design of|H_{d}|^{1/2}. Lowpass filters are used as the basis of our computational comparison. Frequency response error bounds are found and roundof... View full abstract»

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  • On limit cycle amplitudes in error-feedback digital filters

    Publication Year: 1981, Page(s):1227 - 1230
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    It has been indicated by several authors that an upper bound on limit cycles in digital filter structures, which are equivalent to error-feedback digital filters, is given bySigmamin{n=0}max{infin} |h(n)|, where h(n) is the unit pulse response from an error source due to quantization operation to the filter output. For such cases, H(z), the z-transform of h(n), has two poles and two zer... View full abstract»

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  • [Back cover]

    Publication Year: 1981, Page(s): c4
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    Freely Available from IEEE
  • A two-dimensional finite field processor for image filtering

    Publication Year: 1981, Page(s):1140 - 1143
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The paper describes the design of a high speed two-dimensional digital convolver for use as a preprocessor element in a quality control inspection system. The preprocessor architecture is based on the concepts and structures associates with parallel finite field transforms that have been implemented with read-only-memory arrays. The transform is computed over two second-degree extension Galois Fie... View full abstract»

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  • An allpass transformed lattice filter with improved sensitivity properties

    Publication Year: 1981, Page(s):209 - 212
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    The sensitivity of a lattice filter pole location to perturbation of the PARCOR coefficients determines the number of bits of precision required for scalar quantization of those coefficients in LPC. It is demonstrated that the sensitivity characteristics can be altered without sacrificing the desirable properties of the lattice filter. Further, it is argued that for speech it is desirable to lower... View full abstract»

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  • An experimental study of sub-band coder design incorporating recursive quadrature filters and optimum ADPCM

    Publication Year: 1981, Page(s):808 - 811
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    This paper presents the results of an analytical and experimental study of the use of IIR quadrature mirror filters and forward adapting ADPCM with optimum quantizers for octave band sub-band coders for speech. It is shown that the underlying analysis-synthesis systems can be designed such that there is no inter-band aliasing distortion in the coded speech and such that the analysis-synthesis tran... View full abstract»

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  • Feature extraction for laryngeal evaluation

    Publication Year: 1981, Page(s):137 - 140
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Signal processing techniques are utilized in an attempt to discriminate speakers with laryngeal pathology from a normal population. These include classical periodicity analysis and discriminant analysis performed on a set of features representative of the associated all-pole LP models. These are applied to both the acoustic and electroglottographic waveforms. Preliminary results encourage further ... View full abstract»

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  • Time-frequency signal analysis by means of the Wigner distribution

    Publication Year: 1981, Page(s):69 - 72
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The Wigner distribution is a signal transformation that exhibits some very interesting properties with regard to time-frequency signal analysis. The most important of these properties are discussed. The Wigner distribution is then compared with other time-frequency signal representations, such as the spectrogram. It appears that the Wigner distribution is better able to display non-stationarities ... View full abstract»

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  • Effects of input power fluctuations on passive sonar receiver performance

    Publication Year: 1981, Page(s):1034 - 1037
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    Passive sonar receivers operate in environments producing signals and noise with fluctuating power envelopes. The effect of these fluctuations on receiver performance was investigated by a combination of analysis and a Monte Carlo simulation in which signals and noise were represented by members of compound random processes. The receiver was represented by a multichannel analog with an adaptive de... View full abstract»

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  • Acoustic noise suppression in the context of a perceptual model

    Publication Year: 1981, Page(s):1086 - 1088
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    An acoustic noise suppression algorithm has been developed which suppresses noise from speech by first filtering it into a set of signals which approximate the loudness components perceived by the auditory system. These signals are generated by passing the input stimulus waveform through a filter bank with frequency bandwidths which approximate the ear's critical bandwidths. The noise on each sign... View full abstract»

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  • A comparison of spectral estimators for real data

    Publication Year: 1981, Page(s):492 - 495
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    Spectral estimation of real data can be performed by a number of algorithms. This paper compares four methods of estimation. The comparisons are based on three examples which are evaluated in terms of the quality of the estimate, the complexity of the algorithm, and the noise immunity of the estimate. The four estimators are the well-known periodogram, Burg's maximum entropy (AR modelling) method,... View full abstract»

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  • Vocal fold vibratory patterns: Comparison of film and inverse filtering

    Publication Year: 1981, Page(s):133 - 136
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    This paper describes a system for the automatic measurement of numerous vibratory parameters of the vocal cord from high speed films. Our new system, which is an extension of our earlier work, has a much higher gray level range and spatial resolution (256 gray levels, 640×680 pixels) as compared to the previous system (8 gray levels, 90×35 pixels). We present the parameters measured for ... View full abstract»

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