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Radio and Electronic Engineer

Issue 12 • Date December 1972

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Displaying Results 1 - 9 of 9
  • Integrating communications

    Publication Year: 1972
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

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  • A forward error correction system for heavily disturbed data transmission channels

    Publication Year: 1972, Page(s):523 - 530
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1144 KB)

    This paper describes a new forward error correction system suitable for protected data transmission on heavily disturbed transmission channels, such as radio channels or dialled telephone lines. The system consists of two independent coding stages, one designed to combat random errors due to a binomial distribution and the other to correct the remaining bursts. This configuration adapts the system... View full abstract»

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  • A vibrating-blade, end-fire ultrasonic radiator

    Publication Year: 1972, Page(s):531 - 536
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1005 KB)

    The technique of producing highly directional ultrasonic radiation in the end-fire direction consists of exciting a beam (blade) clamped at one end by applying an a.c. signal to piezo-electric strain gauges placed in the best position to produce flexural vibration in the beam. Due to the acoustic impedance mismatch between the material of the beam and the medium to which the beam is coupled standi... View full abstract»

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  • Analysis of computer system reliability and maintainability

    Publication Year: 1972, Page(s):537 - 546
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Equipment failures on computer systems give rise to more interruptions to service and excessive periods of repair time than a user would expect. This paper examines theoretical and actual reliability and repair statistics, showing how the shortcomings are influenced by test techniques, maintenance engineers, application of the system and spares availability. Various reliability and maintainability... View full abstract»

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  • Digital encoding and filtering using delta modulation

    Publication Year: 1972, Page(s):547 - 551
    Cited by:  Papers (20)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1108 KB)

    Digital filters are described which are based on delta modulation rather than pulse code modulation. It is shown that delta modulation encoding may be combined with digital filtering to realize either nonrecursive or recursive types. Conventional digital filter design techniques are applicable in both cases. Simulation of such filters on a small computer is discussed. Quantization noise is conside... View full abstract»

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  • Conference on computers - systems and technology

    Publication Year: 1972, Page(s):552 - 553
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

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  • Conference opening address

    Publication Year: 1972, Page(s):553 - 554
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (385 KB)

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  • Multi-Level Codes

    Publication Year: 1972, Page(s):555 - 561
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (813 KB)

    The use of multi-level p.s.k. arouses interest in non-binary error-correcting codes. This paper points out that the algorithm for constructing BCH codes can be applied when the number of levels is a prime or a power of a prime. Quaternary codes are examined. Possible extensions to higher powers of two and to decimal codes are indicated. View full abstract»

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  • An extension to fukuma and matsubara jump resonance criterion by the use of describing functions

    Publication Year: 1972, Page(s):562 - 568
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    The jump resonance criterion presented by Fukuma and Matsubara normalizes the non-linearity characteristic and restricts its derivative (with respect to the input) to lie within the sector 0 ¿ f'(e) ¿ 1. The region in which jump resonance can occur is localized in the domain near the origin in the inverse polar plane. As compared with the circle criterion which may also be applied in the study o... View full abstract»

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