Proceedings of the IEEE

Issue 1 • Jan. 1981

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Displaying Results 1 - 25 of 30
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): c1
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  • Scanning the issue

    Publication Year: 1981, Page(s): 3
    Cited by:  Papers (1)
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  • Understanding monomode optical fibers

    Publication Year: 1981, Page(s):6 - 13
    Cited by:  Papers (14)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (716 KB)

    Because optical fibers that propagate one mode only are now the most likely candidate for future long-distance high-capacity communication, there is great interest in their light transmission characteristics. Standard descriptions of such fibers are rather unattractive both to students and to the physically minded scientist from several viewpoints, but mostly because numerical methods are always r... View full abstract»

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  • Hill shading and the reflectance map

    Publication Year: 1981, Page(s):14 - 47
    Cited by:  Papers (314)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (6089 KB)

    Shaded overlays for maps give the user an immediate appreciation for the surface topography since they appeal to an important visual depth cue. A brief review of the history of manual methods is followed by a discussion of a number of methods that have been proposed for the automatic generation of shaded overlays. These techniques are compared using the reflectance map as a common representation f... View full abstract»

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  • Acousto-optics—A review of fundamentals

    Publication Year: 1981, Page(s):48 - 53
    Cited by:  Papers (21)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (530 KB)

    The paper first reviews the historical development of acousto-optics and its applications. Following this, a heuristic explanation of acousto-optic effects is presented, with the emphasis on the plane wave model of interaction. Finally, there is a discussion of some basic configurations of relevance to signal processing. View full abstract»

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  • Design considerations for acousto-optic devices

    Publication Year: 1981, Page(s):54 - 64
    Cited by:  Papers (17)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (950 KB)

    The design and fabrication of wide-band bulk acousto-optic modulators (temporal modulation) and beam deflectors (spatial modulation) are described. Optimized device parameters can be obtained systematically for given specifications of the desired modulation bandwidth, throughput efficiency and number of resolvable elements. As the device operating frequency goes beyond a few hundred megahertz, the... View full abstract»

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  • Acousto-optic signal processing: Convolution and correlation

    Publication Year: 1981, Page(s):65 - 79
    Cited by:  Papers (73)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1330 KB)

    The use of acousto-optic devices in real-time signal convolution and correlation has increased dramatically during the past decade because of improvements in device characteristics and implementation techniques. Depending on the application, processing can be implemented via spatial or temporal integration. Two-dimensional signal processing (including image processing) is possile, in spite of the ... View full abstract»

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  • Spectrum analysis using optical processing

    Publication Year: 1981, Page(s):79 - 92
    Cited by:  Papers (27)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1221 KB)

    Spectrum analysis is one of the most fundamental tools in science today. Its use in one form or another spans virtually every discipline. It was one of the first recognized applications of optical processing, and the usefulness of optical spectrum analysis has grown remarkably in the past decade. This is due to the fundamental simplicity, parallelism and intrinsic speed of optical spectrum analyze... View full abstract»

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  • Integrating acousto-optic channelized receivers

    Publication Year: 1981, Page(s):93 - 100
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (644 KB)

    The subject of this paper is acousto-optic channelized receivers with large noncoherent processing gain. A receiver model is developed and the output statistics are derived for signal plus noise input. Noise equivalent bandwidths and signal detection sensitivity are calculated. The implications of large average noise power are discussed. Experimental measurements are in agreement with the theory p... View full abstract»

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  • Photodetectors for acousto-optic signal processors

    Publication Year: 1981, Page(s):100 - 118
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2445 KB)

    A description of devices, architecture, and performance criteria is presented for solid-state CCD and photodiode sensors useful in acousto-optic processing systems. Special attention is given to sensors used in both bulk and integrated optical acousto-optic instantaneous Fourier transform systems. The device physics of silicon photodetectors is presented in detail including discussion and analysis... View full abstract»

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  • Quasi-optics of the waves guided by a slab of uniaxially anisotropic dielectric

    Publication Year: 1981, Page(s):121 - 122
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (265 KB)

    A ray optical method is given for deducing the dispersion relation and the group velocity of the TM wave guided by a slab of uniaxially anisotropic dielectric with particular emphasis on confirming the correctness of the reverse lateral displacement of the ray on total reflection at an interface separating the dielectric from the free space. View full abstract»

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  • Comments on "Resolution of coherent sources incident on a circular antenna array"

    Publication Year: 1981, Page(s):122 - 123
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  • Electrostatic fields inside two planar distributions of potential

    Publication Year: 1981, Page(s):123 - 124
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    The potentials and fields inside two parallel planar distributions of potential can be written as Green's function integrals. Each Green's function can be evaluated numerically by decomposing it into two series of terms (one for large and one for small distances) which converge rapidly within their intervals of use. The accuracy of truncation after a few terms is evaluated. View full abstract»

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  • Frequency domain least-mean-square algorithm

    Publication Year: 1981, Page(s):124 - 126
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    Frequency domain adaptive filtering can be performed by Fourier transforming the input-signal vector and weighting the contents of each frequency bin. By reducing the eigenvalue spread of the data autocorrelation matrix, frequency domain filtering promises great improvements in covergence rate over the conventional time-domain adaptive filtering. View full abstract»

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  • Correction to "Criteria for the separation of real and complex natural modes of dynamical systems"

    Publication Year: 1981, Page(s): 124
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  • An autoregressive moving average tone detector

    Publication Year: 1981, Page(s):126 - 127
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (235 KB)

    A new method for estimating tones in an arbitrary spectrum is presented. An autoregressive-moving average estimator is formulated and transformed into a linear regression problem. Many of the shortcomings of an "all pole" model are overcome and simulated test results indicate that the estimates are not particularly sensitive to additive noise. The main advantages of this new method are computation... View full abstract»

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  • A method for improving the classification speed of clustering algorithms which use a Euclidean distance metric

    Publication Year: 1981, Page(s):128 - 129
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (197 KB)

    Many pattern recognition computer programs use one of the clustering algorithm techniques. Often these algorithms use a Euclidean distance metric as a similarity measure. A scheme is proposed where both the Euclidean metric and a more simple city-block metric are utilized together to reduce overall classification time. The relation between the Euclidean and city-block distances is introduced as a ... View full abstract»

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  • Load frequency sampled-data control via Lyapunov's second method

    Publication Year: 1981, Page(s):129 - 130
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (223 KB)

    This letter presents a sampled-data load frequency control based on the second method of Lyapunov. The proposed method is simple and practically feasible for implementation. A numerical illustration on a two-area load frequency control system is presented in order to verify the practicality of the proposed method. View full abstract»

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  • A device for finding the largest n-bit integer in an N-bit string

    Publication Year: 1981, Page(s):130 - 132
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (326 KB)

    This paper proposes a simple device for finding the maximum or minimum n-bit integer present in an N-bit string at high speed. View full abstract»

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  • Special properties of complement codes for redundant residue number systems

    Publication Year: 1981, Page(s):132 - 133
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (270 KB)

    Redundant residue number systems are of interest because they have properties that are useful for error control and failure recovery in digital processors. This letter shows how complement coding interferes with error detection in redundant residue systems. A technique is given to correct the difficulty computationally, and a modified coding scheme is presented for redundant residue systems. View full abstract»

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  • An adaptive filter for smoothing noisy radar images

    Publication Year: 1981, Page(s):133 - 135
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (504 KB)

    Radar images are corrupted by multiplicative noise due to fading. This paper presents an algorithm for smoothing noisy radar images. The algorithm is easily implemented in the spatial domain and is computationally very efficient. By adapting the filter parameters to local statistics, it is shown that the filter preserves edges. View full abstract»

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  • Liquid velocity measurement using interdigital transducers

    Publication Year: 1981, Page(s):135 - 136
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (140 KB)

    A system for measuring the velocity of a flowing liquid is presented using three interdigital transducers, one of which is used for the radiation of the compressional wave into the liquid. The velocity is estimated from the measurement of the output voltage corresponding to the phase difference between two output signals detected at the output transducers, mounted on the same surface opposite to t... View full abstract»

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  • Two-dimensional signal processing

    Publication Year: 1981, Page(s): 137
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    Freely Available from IEEE
  • Elektrische Nachrichtentechnik-Eigenschaften und Darstellung von Signalen (electrical communication technology

    Publication Year: 1981, Page(s): 137
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    Freely Available from IEEE
  • A guide to F.C.C. equipment authorization

    Publication Year: 1981, Page(s):137 - 138
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    Freely Available from IEEE

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H. Joel Trussell
North Carolina State University