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Proceedings of the IEEE

Issue 7 • July 1984

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

    Publication Year: 1984, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1984, Page(s):755 - 757
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    Freely Available from IEEE
  • Digital optical computing

    Publication Year: 1984, Page(s):758 - 779
    Cited by:  Papers (173)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3637 KB)

    This paper concerns binary digital computing systems in which the information-carrying medium consists entirely or primarily of photons. The paper begins with a review of analog, discrete, and binary methods of representing information in a computer, followed by a survey of many techniques for implementing binary combinatorial and sequential logic functions with individual optical devices and arra... View full abstract»

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  • Architectural considerations involved in the design of an optical digital computer

    Publication Year: 1984, Page(s):780 - 786
    Cited by:  Papers (93)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    Communication problems such as interconnection bandwidth, clock skew, and connectivity restrict computational throughput. Bandwidth and clock skew problems limit the speed and add to the design complexity. Constrained connectivity forces a significant portion of the speed of a processor to be used to compensate for the limited number of interconnections. Philosophically, the large bandwidth, innat... View full abstract»

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  • Optical parallel logic gates using a shadow-casting system for optical digital computing

    Publication Year: 1984, Page(s):787 - 801
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2280 KB)

    A new, simple method of optically implementing optical parallel logic gates has been described. Optical parallel logic gates can be implemented by using a lensless shadow-casting system with a light-emitting diode (LED) array as a light source. Pattern logic, i.e., parallel logic for two binary patterns (variables), is simply obtained with these gates; this logic describes a complete set of logica... View full abstract»

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  • Wide-band electrooptic guided-wave analog-to-digital converters

    Publication Year: 1984, Page(s):802 - 819
    Cited by:  Papers (33)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4689 KB)

    Progress in the development of high-speed electrooptic A/D converters is reviewed. A/D converters of this type have been operated at 1 gigasample/second (GS/s) in 2- and 4-bit structures for 500-MHz analog bandwidth. The converter consists of an array of LiNbO3guided-wave interferometric modulators that function as an analog amplitude analyzer, pulsed lasers for optical sampling, and hi... View full abstract»

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  • Acoustooptic algebraic processing architectures

    Publication Year: 1984, Page(s):820 - 830
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    A new generation of optoelectronic signal processors, many exploiting acoustooptic technology, has been developing during the past several years. These processors are designed to perform algebraic operations like matrix-vector and matrix-matrix multiplication. Major architectures are reviewed, including one that performs with digital accuracy. Processor capabilities are assessed in terms of fundam... View full abstract»

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  • Acoustooptic linear algebra processors: Architectures, algorithms, and applications

    Publication Year: 1984, Page(s):831 - 849
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1935 KB)

    Architectures, algorithms, and applications for systolic processors are described with attention to the realization of parallel algorithms on various optical systolic array processors. Systolic processors for matrices with special structure and matrices of general structure, and the realization of matrix-vector, matrix-matrix, and triple-matrix products and such architectures are described. Parall... View full abstract»

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  • Optical interconnections for VLSI systems

    Publication Year: 1984, Page(s):850 - 866
    Cited by:  Papers (671)  |  Patents (129)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1824 KB)

    The combination of decreasing feature sizes and increasing chip sizes is leading to a communication crisis in the area of VLSI circuits and systems. It is anticipated that the speeds of MOS circuits will soon be limited by interconnection delays, rather than gate delays. This paper investigates the possibility of applying optical and electrooptical technologies to such interconnection problems. Th... View full abstract»

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  • On supercomputing with systolic/wavefront array processors

    Publication Year: 1984, Page(s):867 - 884
    Cited by:  Papers (161)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1491 KB)

    In many scientific and signal processing applications, there are increasing demands for large-volume and/or high-speed computations which call for not only high-speed computing hardware, but also for novel approaches in computer architecture and software techniques in future supercomputers. Tremendous progress has been made on several promising parallel architectures for scientific computations, i... View full abstract»

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  • Wavefront processing of radio-frequency wavefront data

    Publication Year: 1984, Page(s):885 - 888
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A class of special-purpose processors is described. These processors are for use in holographic imaging systems that utilize electromagnetic waves with radio frequencies. The systems, which operate in very nearly real time, consist of arrays of receiving antennas with a receiver at each antenna. The received intensities control modulation in a second array of antennas that radiate waves generated ... View full abstract»

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  • Triple correlations

    Publication Year: 1984, Page(s):889 - 901
    Cited by:  Papers (143)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5398 KB)

    The (auto)triple correlation l(3)(t1, t2) is defined as the triple function integral, applied to the signal l(t) l(3)(t1, t2) = ∫ l(t)l(t + t1)l(t + t2) dt. The triple correlation l(3)(t1, t2) is less popular than the standard (double) correlation l(2)(t1 View full abstract»

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  • The mutual time—Frequency content of two signals

    Publication Year: 1984, Page(s):902 - 908
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    Two independent, ongoing signals are shown to require four dimensions (4D) to describe the ongoing relationships among their times and frequencies. We derive a large number of suitable 4D functions for this purpose, show what each displays best, and show explicit interrelationships among them. The approach of studying two signals using their mutual 4D information pattern rather than by comparing t... View full abstract»

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  • Fiber-optic lattice signal processing

    Publication Year: 1984, Page(s):909 - 930
    Cited by:  Papers (136)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2877 KB)

    We discuss the implementation of fiber-optic lattice structures incorporating single-mode fibers and directional couplers. These fiber structures can be used to perform various high-speed time-domain and frequency-domain functions such as matrix operations and frequency filtering. In this paper we mainly consider systems in which the signals (optical intensities) and coupling coefficients are nonn... View full abstract»

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  • Optical processing using outer-product concepts

    Publication Year: 1984, Page(s):931 - 941
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1058 KB)

    A row vector when left-multiplied by a column vector produces a two-dimensional rank-one matrix in an operation commonly called an outer product between the two vectors. The outer product operation can form the basis for a large variety of higher order algorithms in linear algebra, signal processing, and image processing. This operation can be best implemented in a processor having two-dimensional... View full abstract»

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  • Integrated-optical approaches to numerical optical processing

    Publication Year: 1984, Page(s):942 - 953
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    Recent progress in the design and fabrication of integrated-optical circuits for performing analog numerical computation is reviewed. Both components and algorithms are discussed and particular emphasis is placed on optical techniques for matrix multiplication. View full abstract»

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  • Signal correlation using a one-dimensional electroabsorptive CCD spatial light modulator

    Publication Year: 1984, Page(s):954 - 961
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (713 KB)

    Electrically addressed spatial light modulation (SLM) may be carried out in a GaAs charge-coupled device (CCD) by charge-transfer control of the electroabsorption in the individual storage wells. One-dimensional modulator arrays may be utilized in both space-integrating and time-integrating correlators operated as incoherent optical processors. In the space-integrating case, one SLM controlled by ... View full abstract»

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  • Two-dimensional optical processing using one-dimensional input devices

    Publication Year: 1984, Page(s):962 - 974
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1388 KB)

    Two-dimensional optical processing architectures that are implemented with one-dimensional input spatial light modulators are reviewed. The advanced state of the art of available one-dimensional devices and the flexibility that exists in the design of two-dimensional architectures with one-dimensional transducers leads to the implementation of the most powerful and versatile optical processors. Si... View full abstract»

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  • Recursive implementation of LTV filters—Frozen-time transfer function versus generalized transfer function

    Publication Year: 1984, Page(s):980 - 982
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    Certain researchers synthesize linear time-variant (LTV) filters by assuming a frozen-time relationship between the transfer function and the difference equation. In this letter, the misconception in this synthesis scheme is examined and the comparison between the frozen-time transfer function and the generalized transfer function is also illustrated. View full abstract»

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  • A triangle of coefficients for Chebyshev polynomials

    Publication Year: 1984, Page(s):982 - 983
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The recursive formula used to calculate Chebyshev polynomials of high order requires time-consuming work. Here is an easy and quick application of that formula. View full abstract»

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  • Optimum conditions for fusion splicing of optical fiber

    Publication Year: 1984, Page(s):983 - 984
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (213 KB)

    A low-loss splicing method based on discharge fusion having average splice losses of 0.07 and 0.15 dB for single mode with core diameters of 10 and 7 µm, respectively, and 0.02 dB for 50-µm graded-index optical fibers are obtained. Mathematical expressions for the variation of fusion times and splice losses with effect of applied pressure between the fibers for different axis alignments ... View full abstract»

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  • Numeric approximation of Bessel functions using the DFT

    Publication Year: 1984, Page(s):984 - 985
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    It is well known that the sideband amplitudes of a single-tone frequency-modulated carrier are of the form Jn(B), where B is the modulation index. By selecting appropriate frequency relationships between the sample frequency and the carrier and modulation frequencies, the DFT can be used to calculate Jn(B) with reasonable accuracy. View full abstract»

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  • An object-detection algorithm based on the region-adjacency graph

    Publication Year: 1984, Page(s):985 - 986
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    An object-detection algorithm based on the region adjacency graph of the segmented image is proposed. The new algorithm can detect not only simple, homogeneous objects but also more complex objects consisting of several contiguous subregions. Two examples are presented to demonstrate the usefulness of the algorithm. View full abstract»

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  • On the use of adaptive sampling in hybrid adaptive error models

    Publication Year: 1984, Page(s):986 - 989
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    The use of classical adaptive sampling laws in error models for hybrid adaptive systems developed by Narendra and co-workers is experimented with. Examples are given which demonstrate both the goodness of both the sampling efficiency and the adaptation transients with respect to the use of periodic sampling. View full abstract»

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  • Antenna theory; analysis and design

    Publication Year: 1984, Page(s):989 - 990
    Cited by:  Papers (1)
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    Freely Available from IEEE

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North Carolina State University