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Proceedings of the IEEE

Issue 12 • Dec. 1978

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

    Publication Year: 1978, Page(s): c1
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  • Scanning the issue

    Publication Year: 1978, Page(s): 1591
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  • Offset-parabolic-reflector antennas: A review

    Publication Year: 1978, Page(s):1592 - 1618
    Cited by:  Papers (112)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5471 KB)

    Although used for some decades, the offset-parabolicreflector antenna's electrical properties and performance were not accurately modeled and optimized until the 1960's. This paper reviews, in a tutorial fashion, the state of the art of this important antenna for readers who are not necessarily experts in antenna theory and technology. After a discussion of fundamentals, the performances of both s... View full abstract»

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  • Fuzzy sets, fuzzy algebra, and fuzzy statistics

    Publication Year: 1978, Page(s):1619 - 1639
    Cited by:  Papers (70)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2369 KB)

    The extension of algebraic and analytical concepts to the theory of fuzzy sets appears to play a central role in the investigation of nondeterministic techniques. Since an exact description of any real physical situation is virtually impossbile, it is necessary to develop schemes which deal analytically with decision processes in an imprecise environment. In this paper we are concerned with formul... View full abstract»

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  • Image processing for quality improvement

    Publication Year: 1978, Page(s):1640 - 1651
    Cited by:  Papers (27)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6119 KB)

    In order to encourage the development of computer-based methods which produce better quality pictures, the long and successful history of image processing in photography and graphic arts is called to the attention of the computer fraternity. Studies of contrast sensitivity and of the relationships among illumination, object reflectance, and image luminance are presented. Homomorphic filtering is a... View full abstract»

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  • Reflection from a corner reflector moving at high velocity

    Publication Year: 1978, Page(s):1653 - 1654
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (250 KB)

    Recently, Censor presented an incorrect analysis of the reflection of light from a corner reflector moving at a high velocity. A correct analysis is now presented and experiments suggested by Censor are shown to be impracticable. View full abstract»

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  • On oscillator models containing abrupt nonlinearities

    Publication Year: 1978, Page(s):1654 - 1655
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Two oscillator models with abrupt nonlinearities in their damping stabilization terms are suggested and considered. The abrupt nonlinearities investigated are those of half-wave rectification. Certain practical implications of the models are discussed, among them the possibility of stabilizing an oscillator waveform at only one half of its waveform while leaving it free running at the other half. View full abstract»

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  • Analysis of constrained active networks

    Publication Year: 1978, Page(s):1655 - 1657
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A simplified procedure for computing the transfer functions of an active filter involving single or multiple operational amplifiers is presented. Illustrative examples are given. View full abstract»

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  • A simplified approach to continued fraction inversion based on matrix formulation

    Publication Year: 1978, Page(s):1657 - 1658
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (159 KB)

    An improved algorithm for the continued fraction inversion based on matrix formulation [1] is presented. View full abstract»

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  • Adaptive filtering in the frequency domain

    Publication Year: 1978, Page(s):1658 - 1659
    Cited by:  Papers (172)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (169 KB)

    Adaptive filtering in the frequency domain can be accomplished by Fourier transformation of the input signal and independent weighting of the contents of each frequency bin. The frequency-domain filter performs similarly to a conventional adaptive transversal filter but promises a significant reduction in computation when the number of weights equals or exceeds 16. View full abstract»

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  • Sequential regression considerations of an adaptive filtering example

    Publication Year: 1978, Page(s):1660 - 1662
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    In this communication we discuss an example that has appeared in two recent articles [1], [2], in terms of a sequential regression formulation. The example concerns the approximation of a fixed second-order filter by a first-order adaptive filter, when subjected to a white noise input. View full abstract»

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  • The generalized Halpern filter

    Publication Year: 1978, Page(s):1662 - 1664
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (261 KB)

    In this letter, a general method is introduced for the design of monotonic all-pole low-pas filters. It is shown that by using the shifted Jacobi polynomials the Halpern filter and the maximally flat magnitude beyond the origin filters can be obtained as special cases of this method. Many useful filter designs can be achieved by the variation of two parameters. View full abstract»

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  • An equivalence relation in planar least squares inverse approximation

    Publication Year: 1978, Page(s): 1662
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    It is shown that the Planar Least Square Inverse (PLSI) of degree (sm, tn) relative to the lacunary polynomial b(z1s, z<2t)is obtained from the PLSI of degree (m, n) relative to b(z1, z2) by the substitution z1→ z1s, z2→ z<2t. View full abstract»

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  • A precision low-frequency current-amplifier circuit technique

    Publication Year: 1978, Page(s):1664 - 1666
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A current-balancing scheme is employed in the design of an amplifier having a low incremental input resistance, a high incremental output resistance, and a low-frequency current gain that is primarily determined, over a wide cunent range, by the ratio of two resistances. View full abstract»

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  • Active-R realization of bilinear RL impedances and their applications in a high-Q parallel resonator and external capacitorless oscillator

    Publication Year: 1978, Page(s):1666 - 1668
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    Realization of bilinear RL impedances use only one operational amplifier (OA) and one or two resistors is proposed. These are based on the single-pole model of the OA. Applicabilities of these one-port active-R grounded inductances in a parallel capacitor tuned high-Qresonator and in a new external capacitorless sine-wave oscillator are also reported tosether with experimental verification. View full abstract»

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  • 1-distinguishability of SEC graphs

    Publication Year: 1978, Page(s):1668 - 1669
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    This letter describes a new scheme to determine the all minimal edge sets of a SEC graph under which the graph becomes 1- distinguishable. The problem has been treated within the framework of switching theory by showing its equivalence to the classical problem of prime implicant covering. View full abstract»

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  • Comments on "Analysis of a switch matrix for an SS/TDMA system"

    Publication Year: 1978, Page(s):1669 - 1670
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (237 KB)

    The time slot assignment algorithm presented in the above paper requires some modifications and/or refinements for it to be complete. A few methods to resolve problems in the algorithm are suggested in this letter, and a related theorem in combinatorial theory is also discussed. View full abstract»

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  • Selectivity of semiconductor gas sensors

    Publication Year: 1978, Page(s):1670 - 1671
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    It is shown that Taguchi Gas sensors Types 812 and 813 exhibit a marked degree of selectivity to carbon monoxide and methane, and curves of their performance in mixtures of these gases are presented. View full abstract»

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  • Calculation of filter inductance for chopper-fed DC separately excited motor

    Publication Year: 1978, Page(s):1671 - 1673
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    A method is presented for calculating the value of filter inductance such that while the discontinuous conduction will be eliminated and current ripple will be reduced to the prescribed limits, its (filter inductance) adverse affects, such as deterioration of transient response, etc., will be minimal. View full abstract»

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  • Comments on printing of computer-generated halftones

    Publication Year: 1978, Page(s): 1673
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  • On a possible optical improvement for data treatment in transaxial tomography

    Publication Year: 1978, Page(s):1674 - 1675
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    In transaxial tomography, when a "rho-filter" technique is employed to obtain the final image, an important altering effect appears, which is due to the necessary truncation of the primitive crypted object. However, that kind of distortion may be almost completely eliminated, using suitable interferometric means. View full abstract»

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  • Machine recognition of patterns

    Publication Year: 1978, Page(s): 1676
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  • Theory of electrical filters

    Publication Year: 1978, Page(s):1676 - 1677
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  • Book alert

    Publication Year: 1978, Page(s):1677 - 1678
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  • [Back cover]

    Publication Year: 1978, Page(s): c4
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Editor-in-Chief
H. Joel Trussell
North Carolina State University