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IEEE Transactions on Communication Technology

Issue 5 • Date October 1969

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • Development Work on the Electronic Switching System in Japan

    Publication Year: 1969, Page(s):505 - 512
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1011 KB)

    After 10 years research on the electronic switching system, Nippon Telephone and Telegraph (NTT) decided to develop the electronic switching system with stored program control in 1964. The Dendenkosha (NTT) electronic switching system for experiment DEX-I system was designed as the experimental space division unit to study the program control technique, and has the ferreed switch network and the c... View full abstract»

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  • The PERICLES Electronic Switching System

    Publication Year: 1969, Page(s):513 - 518
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The PERICLES system is a stored-program electronic switching system. The type presently being developed is meant to cover the predicted French Post Office needs from 1972 in the range of 4000-30 000 lines. The typical features of the system are described. A PERICLES exchange is composed of three different parts: the central control unit, the switching network, and the access devices to the links. ... View full abstract»

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  • The Surface-Wave Transmission Line and Its Use in Communicating with High-Speed Vehicles

    Publication Year: 1969, Page(s):518 - 525
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (980 KB)

    The potential use of surface waves for the communication and control link with high-speed trains is being studied for the U. S. Department of Transportation, Office of High-Speed Ground Transportation. The results are presented for the first part of this study, which dealt with the feasibility of using the surfacewave transmission line (SWTL) as this link, including its characteristics, launching ... View full abstract»

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  • On Optimal Signals for Phase-Locked Loops

    Publication Year: 1969, Page(s):526 - 531
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (455 KB)

    The performance of phase-locked or delay-locked loops is dependent both upon the signal-to-noise ratio (SNR) of the received signal and the detailed structure of both the received signal and the local-reference signal. Optimum signals for first-order delay-locked loops are determined as functions of the loop SNR using simple optimization criteria. View full abstract»

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  • An Upper Bound for the Error Probability on the Gilbert Channel

    Publication Year: 1969, Page(s):532 - 535
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    The binary symmetrical channel with memory (Gilbert model) allows a satisfactory approximation of the error distribution on real channels characterized by error bursts. Its use is, however, relatively limited due to the computing involvemeats, which usually lead to the programming of the respective problems on a computer. Two manners of simplifying the computation of the probability View full abstract»

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  • Frequency-Domain Partial-Response Signals for Parallel Data Transmission

    Publication Year: 1969, Page(s):536 - 543
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    Linearly independent (rather than orthogonal) superpositions of harmonically related sine and cosine pulses of duration T form the basis of partial-response signals for parallel data transmission through K overlapping channels. The channels are equally spaced by b=1/T , each one carry... View full abstract»

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  • Wirephoto Standards Converter

    Publication Year: 1969, Page(s):544 - 553
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2087 KB)

    A standards converter that translates simultaneously between the United States and European wirephoto networks has been developed. Items of noncompatibility include picture duration, lines per minute, lines per inch, and scanning direction. The system operates completely automatically. It discriminates between voice and picture signals, adjusts for input level, and determines the input line scanni... View full abstract»

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  • Feedback Balanced Code for Multilevel PCM Transmission

    Publication Year: 1969, Page(s):554 - 563
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1054 KB)

    This paper describes a new code format called the feedback balanced code (FBC) for multilevel pulse code modulation (PCM) transmission, which is easily implemented and is capable of efficient utilization of transmission cable. The FBC is a type of multilevel code which has no dc wander and is obtained by the polarity control of the output pulse sequence using negative feedback. The principle of th... View full abstract»

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  • An Experimental Approach to Video Bandwidth Compression by Multiplexing

    Publication Year: 1969, Page(s):564 - 568
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (679 KB)

    A system is described, which is based on structural and perceptual redundancy. It employs the idle periods of one picture to introduce information from other pictures and integrates over several TV frames. The system is capable of multiplexing 15 high-resolution black and white TV channels. View full abstract»

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  • A Field Test of Error Control Systems

    Publication Year: 1969, Page(s):569 - 571
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    This paper presents the condensed results of a field test of three types of forward error correction equipments operated over transcontinental HF links. The equipments were first operated from west to east over a 3000-mile link to establish the basic bit error performance. The equipments were then integrated into an operational system and used in conjunction with an error correcting system operate... View full abstract»

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  • Digital Computation of FM Distortion due to Bandpass Filters

    Publication Year: 1969, Page(s):571 - 574
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A numerical method which uses a first-order approximation for calculating FM distortion due to bandpass filters has been developed. The transfer function of the bandpass filter is represented by a Fourier series. The numerical accuracy of this method can be determined by checking the sampled impulse response of the network and the sampled autocorrelation function of the phase distortion. Applicati... View full abstract»

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  • Comments on Optical Heterodyne Detection

    Publication Year: 1969, Page(s):574 - 578
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    An investigation of the response of a quantum detector to a prescribed incident electromagnetic field is presented. For the fields used, a statistical description of the resulting current flow is given. First and second moments of the resulting densities are calculated, and signal-to-noise ratios are computed. View full abstract»

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  • On the Accuracy of the Envelope Method for the Measurement of Doppler Spread

    Publication Year: 1969, Page(s):578 - 581
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    The accuracy achievable by the envelope method in the measurement of the Doppler spread of a dispersive channel or, more generally, of any scintillating source that can be modeled as a Gaussian process is evaluated. Specifically, the effects of additive independent noise, finite sample size, and numerical differentiation are discussed, and analytical expressions are given for the resulting errors. View full abstract»

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  • Note on Coherent Quadrature Modulation

    Publication Year: 1969, Page(s):581 - 583
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (354 KB)

    Coherent quadrature modulation has long been identified with the bandwidth-efficient transmission of low-pass signals over bandpass media. A significant recent contribution to the theory of parallel transmission has been that of O'Neill and Saltzberg; they showed that if there was proper synchronization between the modulating carrier and the data clock, then the two parallel channels in coherent q... View full abstract»

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  • Binary Decoding Extended to Nonbinary Demodulation of Phase Shift Keying

    Publication Year: 1969, Page(s):583 - 588
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The required energy per information bit E_{B}/N_{o} to achieve a specified error probability with a binary error correcting code is reduced by retaining partial knowledge of digit amplitudes. Quantization to three or four levels is the minimum step of demodulator complexity beyond hard decisions. A simple extension of binary decoding is described which achie... View full abstract»

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  • Self-Noise of Frequency Hopping Signals

    Publication Year: 1969, Page(s):588 - 590
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB)

    The self-noise of a system that uses frequency hopping for channel coding is determined for the limiting case of no receiver noise. The noise output is found to be a semirandom sequence of "clicks." Adjacent clicks are correlated, and the power density spectrum is of the form \sin^{2} x . View full abstract»

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  • Signal-To-Noise Ratio Out of an Ideal FM Detector for SSB FM Plus Gaussian Noise at the Input

    Publication Year: 1969, Page(s):591 - 592
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The signal-to-noise ratio (SNR) at the output of an ideal FM detector is determined as a function of the modulation index for the case of an SSB-FM signal plus narrow-band Gaussian noise at the input, where the input SNR is large. The modulation is assumed to be sinusoidal, and the noise is taken to be flat over the intermediate frequency band. View full abstract»

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  • An Experimental Pulse Code Modulation Encoder for 24 Speech Channels

    Publication Year: 1969, Page(s):592 - 594
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    An encoder is described which features nonuniform qnantizing by combining the processes of encoding and compression. The encoder utilizes the feedback weighing principle and achieves compression in accordance with a 13-segment characteristic. A distinguishing feature of the encoder is that it uses a certain redundancy in circuit elements instead of employing elements with close tolerances. View full abstract»

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  • [Back cover]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope