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IEEE Transactions on Acoustics, Speech, and Signal Processing

Issue 6 • December 1979

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Displaying Results 1 - 25 of 38
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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  • An efficient algorithm for a large Toeplitz set of linear equations

    Publication Year: 1979, Page(s):612 - 615
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    An algorithm is presented which requires2n^{2} + 8n log_{2} n - ncomputations for solving a set ofnlinear Toeplitz equations for n = 2k, where k is a positive integer. The previously known algorithms require a minimum of 3n2computations. The major advantage of the algorithm is realized for those applications where the set of n Toeplitz equations Tx = c i... View full abstract»

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  • Comments on "The theory of transient intermodulation distortion"

    Publication Year: 1979, Page(s):653 - 654
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (262 KB)

    The conditions for avoiding transient intermodulation distortion (TIMD) in a feedback amplifier have been overstated. There is no TIMD penalty whatsoever in using high loop gain around a forward path that has a dominant pole, provided the forward-path gain is concentrated after this dominant pole. View full abstract»

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  • Authors' reply

    Publication Year: 1979, Page(s): 654
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (147 KB)

    First Page of the Article
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  • Correction to "Nonminimal realizations of fixed point digital filters that are free of all finite wordlength limit cycles"

    Publication Year: 1979, Page(s): 658
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB)

    First Page of the Article
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  • Guest editorial

    Publication Year: 1979, Page(s): 669
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1979, Page(s): c4
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    Freely Available from IEEE
  • Fortran subroutines for the solution of Toepltiz sets of linear equations

    Publication Year: 1979, Page(s):656 - 658
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Two subroutines for the solution of a Toeplitz set of m linear equations are presented. The symmetric case requires 3m memory locations, while the nonsymmetric case requires 5m memory locations. View full abstract»

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  • Image modeling and quality criteria

    Publication Year: 1979, Page(s):649 - 652
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    When an image which is disturbed by additive noise is recursively filtered, the filter is derived from a dynamic model based on the second-order statistics of the original image and noise. For given image statistics, it is possible to consider different models. The choice of a model may influence the quality of the filter results. To compare different models representing the same image, three qual... View full abstract»

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  • Digital echo cancellation for baseband data transmission

    Publication Year: 1979, Page(s):768 - 781
    Cited by:  Papers (97)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2304 KB)

    In analogy with analog speech transmission, simultaneous two-way ("full-duplex") transmission of data signals over two-wire circuits can, in principle, be achieved by the application of hybrid couplers. In practice the resulting imperfect isolation between transmitter and receiver at the same end of a connection is disastrous for the detection of the data from the other end and has to be nullified... View full abstract»

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  • Optimal design of FIR digital filters with monotone passband response

    Publication Year: 1979, Page(s):643 - 649
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The application of linear programming to the design of FIR digital filters with constraints on the derivative of the frequency response is described. Numerical considerations in the implementation are discussed and a program is given with examples for the design of filters with optional monotone response in passbands. The method provides the user with an additional degree of flexibility over the R... View full abstract»

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  • A PCM/ADM and ADM/PCM code converter

    Publication Year: 1979, Page(s):762 - 768
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    In this paper a bidirectional code converter system that converts PCM to ADM and ADM to PCM directly in the digital domain is studied. The particular coding schemes chosen for study are the μ-255 PCM with the rate of 64 kbits/s and the continuously variable slope delta modulation (CVSD) with 32 kbits/s. Efficient realization of the converter hardware is also considered. View full abstract»

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  • A new approach for the design of digital interpolating filters

    Publication Year: 1979, Page(s):637 - 643
    Cited by:  Papers (33)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The paper presents a new class of interpolators characterized by the property that the mean power of their error sequence, as a function of frequency, approximates zero in the Chebyshev sense. The design method, which is based on some observation and newly found general properties, will be described in some detail. An example shows the special properties of these interpolators in comparison with f... View full abstract»

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  • Image enhancement by stochastic homomorphic filtering

    Publication Year: 1979, Page(s):625 - 637
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4128 KB)

    The problem of image enhancement by nonlinear two-dimensional (2-D) homomorphic filtering is approached using stochastic models of the signal and degradations. Homomorphic filtering has been previously used for image enhancement, but the linear filtering operation has generally been chosen heuristically. In this paper stochastic image models previously described and analyzed by the authors are use... View full abstract»

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  • Design of a 24-channel transmultiplexer

    Publication Year: 1979, Page(s):752 - 762
    Cited by:  Papers (40)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    The design of a transmultiplexer capable of performing the bilateral conversion between one 1544 kbit/s digital signal (which represents 24 PCM coded voice channels) and two analog group signals (each one containing 12 voice channels in the 60-108 kHz band) is investigated. It is shown that an FIR filter bank required as part of such a transmultiplexer can be realized efficiently by cascading a di... View full abstract»

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  • Shifted sideband beamformer

    Publication Year: 1979, Page(s):713 - 722
    Cited by:  Papers (13)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    A fundamentally different time domain beamformer structure is described which can be used to process bandpass sensor signals efficiently. The beamformer operates directly on complex, frequency translated, single sideband representations of the input signals to obtain a similar representation of the beam output. Such representations are typically obtained by complex demodulation of the signals to f... View full abstract»

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  • Near-field performance of passive coherence processing sonars

    Publication Year: 1979, Page(s):573 - 582
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Recently, passive sonar systems using two or more stationary receivers have been used for the detection and localization of moving acoustic targets. In far-field configurations, where the receivers are remotely located from the source, the use of the magnitude-squared coherence function (MSCF) has proved attractive. In this paper near-field configurations are considered, where the interreceiver sp... View full abstract»

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  • An introduction to statistical signal processing with applications

    Publication Year: 1979, Page(s):660 - 661
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    First Page of the Article
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  • An underwater acoustic pulse compression system

    Publication Year: 1979, Page(s):723 - 728
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    This paper describes the signal processing scheme used in sources and receivers for the remote acoustic measurement of the oceanic sound velocity field. Ocean sound velocity varies in response to interior dynamic processes so that a continuous sound field measurement is expected to provide a unique view of physical oceanographic phenomena. The basic signal processing technique uses maximal length ... View full abstract»

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  • On the problem of designing IIR digital filters with short coefficient word lengths

    Publication Year: 1979, Page(s):620 - 624
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The paper presents an algorithm for designing IIR digital filters with short coefficient word lengths. The algorithm has the flexibility of obtaining a better design at the expense of investing more computational time. It was found that, by incorporating Crochiere's idea of equalizing passband and stopband statistical word lengths before applying the algorithm, we are capable of obtaining a furthe... View full abstract»

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  • A hardware multitone digital frequency synthesizer

    Publication Year: 1979, Page(s):804 - 809
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The synthesis of two or more tones simultaneously has numerous applications, including telephone signaling, music synthesis, waveform generation, and man-machine communications. We describe a hardware approach in which the basic tones are generated digitally for accuracy and stability, using time-shared circuitry. The tones are combined and their levels are controlled by an analog approach using a... View full abstract»

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  • Speaker-independent isolated word recognition for a moderate size(54 word)vocabulary

    Publication Year: 1979, Page(s):583 - 587
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Recent work at Bell Laboratories has shown that statistical clustering techniques could be used to provide a reliable set of reference templates for a speaker-independent isolated-word recognition system. The vocabulary on which the system was tested consisted of the 26 letters of the alphabet, the 10 digits (0 to 9), and 3 command words. Since this vocabulary consisted of a large number of acoust... View full abstract»

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  • A radix-4 FFT processor for application in a 60-channel transmultiplexer using TTL technology

    Publication Year: 1979, Page(s):746 - 751
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A hardware solution for the two 128-point o2DFT processors with a transform time of 125 μs needed in a 60-channel transmultiplexer for conversion between FDM and TDM signals is presented. It is shown how the mathematical redundancy of the processing can be removed, thus leading to a structure where the two transforms are realized as a 64-point FFT processor with 64 complex pre- and... View full abstract»

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  • Digital processing of ionospheric electron content data

    Publication Year: 1979, Page(s):705 - 712
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    Ionospheric electron content data contain periodicities that are produced by a diversity of sources including hydromagnetic waves, gravity waves, and lunar tides. Often these periodicities are masked by the strong daily variation in the data. Digital filtering can be used to isolate the weaker components. The filtered data can then be further processed to provide estimates of the source properties... View full abstract»

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  • On a microcomputer implementation of an intrusion-detection algorithm

    Publication Year: 1979, Page(s):782 - 789
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The main objective of this paper is to discuss various aspects of implementing a specific intrusion-detection scheme on a micro-computer system using fixed-point arithmetic. The proposed scheme is suitable for detecting intruder stimuli which are in the form of transient signals. It consists of two stages: an adaptive digital predictor and an adaptive threshold detection algorithm. Experimental re... View full abstract»

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Aims & Scope

This Transactions ceased production in 1990. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope