Proceedings of the IEEE

Issue 4 • April 1977

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

    Publication Year: 1977, Page(s): c1
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  • Scanning the issue

    Publication Year: 1977, Page(s): 499
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  • A survey of sparse matrix research

    Publication Year: 1977, Page(s):500 - 535
    Cited by:  Papers (124)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4220 KB)

    This paper surveys the state of the art in sparse matrix research in January 1976. Much of the survey deals with the solution of sparse simultaneous linear equations, including the storage of such matrices and the effect of paging on sparse matrix algorithms. In the symmetric case, relevant terms from graph theory are defined. Band systems and matrices arising from the discretization of partial di... View full abstract»

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  • Adaptive quantization of picture signals using spatial masking

    Publication Year: 1977, Page(s):536 - 548
    Cited by:  Papers (107)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1482 KB)

    Visual sensitivity of human observers decreases at and adjacent to large luminance changes: a fact well known to psychophysicists but not yet fully utilized for picture coding. In this paper we present a systematic investigation of these changes in visual sensitivity and apply it to adapt the quantizer of a predictive coder. The paper consists of three parts. In the first part, earlier psychophysi... View full abstract»

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  • The future outlook for U.S. electricity supply and demand

    Publication Year: 1977, Page(s):549 - 561
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    In this paper we assess the prospects of the United States' electric utility industry from now to 1995. The methodology employed is a mathematical model of electricity supply and demand that has been constructed to analyze the future behavior of the industry in response to changing resource and regulatory parameters. A set of supply and demand projections derived from the model is compared and con... View full abstract»

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  • Applications of numbered undirected graphs

    Publication Year: 1977, Page(s):562 - 570
    Cited by:  Papers (102)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1040 KB)

    Numbered undirected graphs are becoming an increasingly useful family of mathematical models for a broad range of applications. They have found usage in various coding theory problems, including the design of good radar-type codes, synch-set codes and convolutional codes with optimal autocorrelation properties. They facilitate the optimal nonstandard encodings of integers. They have also been appl... View full abstract»

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  • Reflection mechanisms, Doppler effect, and special relativity

    Publication Year: 1977, Page(s): 572
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (142 KB)

    Recently, Ashworth and Davies concluded that the theory of special relativity cannot be tested by reflection of light from a mirror moving parallel to itself. It is now shown that the corner reflector, which is already implemented in the space vehicle LAGEOS, is equally inadequate. However, the corner reflector does produce a second-order transverse Doppler effect, as already noted by Dashchuk. Th... View full abstract»

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  • The coefficients of potential of two-dimensional regions with rotational antisymmetry

    Publication Year: 1977, Page(s):572 - 574
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (273 KB)

    If a two-dimensional compound region with rotational antisymmetry is sixfold, eightfold, or twelvefold, the matrix of coefficients of potential can be derived from the consideration of previous letters [1], [2]. This matrix leads us to the exact resistance values of various connections of electrodes. View full abstract»

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  • Frequency domain synthesis of IIR digital filters by means of associated FIR filters

    Publication Year: 1977, Page(s):574 - 576
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (271 KB)

    This correspondence describes a synthesis technique for IIR digital filters which allows the use of approximation methods already developed for designing FIR filters. The technique is based on the definition, by means of a suitable transformation, of a FIR filter associated to the desired IIR filter. An example of application is given and the related results are briefly discussed. View full abstract»

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  • A note on periodic solutions in weakly nonlinear systems

    Publication Year: 1977, Page(s): 574
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    A counterexample to a weakly nonlinear approach [1] to the existence of oscillations is presented. View full abstract»

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  • Evaluation of constituent matrices of a companion matrix with repeated eigenvalues

    Publication Year: 1977, Page(s):576 - 577
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (207 KB)

    An analytical function of a companion matrix with repeated eigenvalues is expressed in terms of constituent matrices. The constituent matrices are then found to be equal to the product of two matrices with elements partly from a certain matrix and its inversion. This matrix may be either a Vandermonde matrix or a modal matrix. Equations for computing these matrices are given as a power series of x... View full abstract»

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  • An alternate parallel realization of digital transfer function

    Publication Year: 1977, Page(s):577 - 578
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (210 KB)

    A new type of parallel realization of a digital transfer function is proposed. The new structure is also canonic with respect to delays, multipliers, and adders. Expressions for the round-off noise variances for the new structure and its transpose are derived. An illustrative example is included. View full abstract»

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  • Transmission line discriminators for FM noise measurements

    Publication Year: 1977, Page(s):578 - 580
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (355 KB)

    There is a need for a simple FM noise measurement technique for signal sources operating below 5 GHz. Improved transmission line discriminators are described which have good immunity to incidental AM on the test signal and have adequate threshold. Operating procedures and experiences are discussed. View full abstract»

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  • A parallel-T based RC active notch filter

    Publication Year: 1977, Page(s):580 - 581
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (217 KB)

    A new single amplifier (infinite gain) symmetrical notch network is described where the pole positions are defined by the transmission zeroes of an RC parallel-T circuit. It is shown that the structure described has an independently adjustable notch depth and is relatively insensitive to amplifier gain variations. View full abstract»

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  • On the "Metastable region" of flip-flop circuits

    Publication Year: 1977, Page(s):581 - 583
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (255 KB)

    In [1], Couranz and Wann studied the behavior of synchronizers operating in the metastable region; their analysis of the circuit was based on a probabilistic description using random noise as the driving force. We present an alternate and much simpler deterministic description of the circuit behavior based on a study of the circuit differential equation. View full abstract»

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  • Comments on "The active medium propagation device"

    Publication Year: 1977, Page(s):583 - 584
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  • On resistor loops in hybrid circuits

    Publication Year: 1977, Page(s): 583
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (111 KB)

    A simple method is presented for measuring the individual resistances in a loop of resistors without breaking the loop. Such a problem is often encountered in hybrid integrated circuits. Our method is exact and noniterative, in contrast to an alternative method recently suggested in the literature. Also, it requires n number of measurements for an n-resistor loop and hence is canonic. View full abstract»

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  • Harmonic oscillation using Λ-shaped negative resistance device

    Publication Year: 1977, Page(s):584 - 586
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (293 KB)

    The oscillator performance of A-shaped negative resistance devices is numerically analyzed. The most distinguished feature revealed is that the Λ-shaped device shows a monotonic increase of output power with increasing bias voltage. A maximum oscillation efficiency as high as 94 percent is predicted. View full abstract»

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  • Moments of the binomial and pascal distributions

    Publication Year: 1977, Page(s):586 - 587
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    This note provides general expressions for the mth moment of the binomial and Pascal distributions. These expressions permit convenient moment evaluation for the cases of a large number of trials, a small probability of event occurrence, or a high-order moment. View full abstract»

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  • Comments on "A new solution to adaptive control"

    Publication Year: 1977, Page(s):587 - 588
    Cited by:  Papers (5)
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  • A further comment on "Simulation of the effects of network changes in power system load flows"

    Publication Year: 1977, Page(s):588 - 589
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  • Imaging of atoms: Three-dimensional molecular structure reconstructions using opto-digital computing

    Publication Year: 1977, Page(s):589 - 591
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (700 KB)

    Opto-digital computing makes it possible to obtain 3-D atomic imaging display of crystallized molecular structures without manual model building. The method makes use of the principles of holography and of optical computing. View full abstract»

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  • Plasma scattering of electromagnetic radiation

    Publication Year: 1977, Page(s): 592
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  • Book alert

    Publication Year: 1977, Page(s): 592
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  • [Back cover]

    Publication Year: 1977, Page(s): c4
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H. Joel Trussell
North Carolina State University