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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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    Freely Available from IEEE
  • 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
  • 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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  • 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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  • 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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  • 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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  • 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 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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  • Applications of adaptive digital filtering to the data processing for the environmental system

    Publication Year: 1979, Page(s):790 - 803
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    In this paper a least mean-square (LMS) adaptive digital filter (ADF) is used in order to detect the extraordinary levels of air pollution data, to predict the future air pollution levels, and to identify the unknown parameters in the environmental system. The technique used here is based on the recursive adaptive digital filtering method proposed by White, which is an extension of the usual ADF b... View full abstract»

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  • Analytic signal processing in music computation

    Publication Year: 1979, Page(s):670 - 684
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    Digital synthesis of music has led to the consideration of models other than the usual additive (Fourier) synthesis of waveforms. One of these methods, based on the FM equation, has been found to be of particular value due to its easy implementation and the richness and evolutionary character of its harmonic structure in time. Any useful synthesis procedure should be accompanied by a corresponding... 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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  • 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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  • 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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  • On tape-cut editing with a fixed head type PCM tape recorder

    Publication Year: 1979, Page(s):739 - 745
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    The PCM tape recorder should perform the traditional function of recording for practical use in studios. Along with electronic editing, tape-cut editing will also play an important role in studio work. Advantages of tape-cut editing are as follows. 1) Editing time can be minimized if splice points are not numerous. 2) Editing can be performed with only one PCM deck without expensive electronic equ... View full abstract»

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  • A speech digitizer at 2400 bits/s

    Publication Year: 1979, Page(s):729 - 733
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    This paper describes a speech digitizer that is capable of transmitting and receiving at 2400 bits/s. Comparisons are made between this implementation and past approaches. Typical applications of such digitizers are also described. 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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  • Microcomputer-based digital filters for EEG processing

    Publication Year: 1979, Page(s):697 - 705
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    Fourth-order bandpass recursive digital filters, realized in cascade form, are implemented in a 16-bit microprocessor, enabling sampling frequencies up to 3.3 kHz, with the use of the processor's multiply instruction. The design did not follow the usual choice of canonical forms and scaling within the filter structure. On the contrary, the input wordlength is set at 12 bits and the filters are all... 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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  • 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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Aims & Scope

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

Full Aims & Scope