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1887

Journal of the Institution of Electronic and Radio Engineers

Volume 58, Issue 2, March April 1988

Volumes & issues:

Volume 58, Issue 2

March April 1988

The future of the Journal
Imminent access recognition: A protocol for integrated traffic on a CSMA/CD local area network
Transmission of digital sound over channels with unforeseen bandwidth limitations
  • Author(s): K.A. Schouhamer Immink
  • Source: Journal of the Institution of Electronic and Radio Engineers, Volume 58, Issue 2, p. 49 –56
  • DOI:  10.1049/jiere.1988.0008
  • Type: Article
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  • p. 49 –56 (8)
    A new technique for encoding and decoding digital audio signals offers the advantage of a graceful degradation of the audio performance when the signal is conveyed over channels with a wide range of bandwidths. The flexibility of the new technique also provides a key to the future evolution of the quality of digital audio or video systems within the same digital format. The technique described may well be of particular value in applications involving the storage or broadcast of digital audio signals when the transmitter and receiver are ignorant of the exact bandwidth of the communication system.
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A concurrent high-level language based real-time controller
  • Author(s): J.M. van Campenhout  and  E.H. Debaere
  • Source: Journal of the Institution of Electronic and Radio Engineers, Volume 58, Issue 2, p. 57 –62
  • DOI:  10.1049/jiere.1988.0009
  • Type: Article
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  • p. 57 –62 (6)
    Real-time control applications pose particular implementation problems caused by the required low latency to external events, the highly concurrent nature of the application software, and the reliability requirements usually associated with control. The implementation of concurrent real-time software is typically done at the machine language level, which is difficult, costly and non-portable. In this paper, a shared-memory multiprocessor realization of Modula-2 is proposed as a possible high-level language environment for real-time control applications. The implementation is well suited to support dynamic processor allocation and quick runtime response to external events.
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Automatic vector impedance measurement with minimum hardware
  • Author(s): Mahmoud F. Wagdy
  • Source: Journal of the Institution of Electronic and Radio Engineers, Volume 58, Issue 2, p. 63 –66
  • DOI:  10.1049/jiere.1988.0010
  • Type: Article
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  • p. 63 –66 (4)
    A computer-based technique for vector impedance measurement is described. An alternating voltage of specified frequency is impressed across a series combination of the unknown impedance Z and a reference resistance R0,; the voltage to ground and the phase angle at the nodal connection are then measured and recorded. Measurements are repeated after interchanging Z and R0, and the magnitude and phase of Z and R0 are automatically calculated. Alternatively, Z and R0 are not interchanged, so that the amount of hardware is reduced at the expense of a software algorithm for determining |Z| and θ. This trade-off simplifies the design and makes it more cost effective.
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Radar 1935–45: ten years that changed the face of war
  • Author(s): D.J. Martin
  • Source: Journal of the Institution of Electronic and Radio Engineers, Volume 58, Issue 2, p. 67 –73
  • DOI:  10.1049/jiere.1988.0011
  • Type: Article
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  • p. 67 –73 (7)
    The paper presents a technical view of the historic ten years from 1935 to 1945 during which operational military radar was developed from the first operational CH stations to the miniature APS-4 airborne ‘podded’ radars which saw operational service at the end of the war. The events leading to the British and German military work are set down, and the principal contributions to wartime radar made from industry and the universities described. The paper ends with a review of the major evolutionary factors which made military radar so important to the Allied war effort during the course of the war.
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A comparison of decision-feedback equalizers for a 9600 bit/s modem
  • Author(s): A.P. Clark ; S.N. Abdullah ; S.Y. Ameen
  • Source: Journal of the Institution of Electronic and Radio Engineers, Volume 58, Issue 2, p. 74 –83
  • DOI:  10.1049/jiere.1988.0012
  • Type: Article
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  • p. 74 –83 (10)
    When a digital data signal is received over a linear channel that distorts the signal, the resulting intersymbol-interference can be removed, or at least greatly reduced, by means of a decision-feedback equalizer. A conventional equalizer is adjusted adaptively to minimize the mean-square error in the equalized signal, where the error is caused partly by intersymbol interference and partly by noise. Alternatively, the equalizer may be adjusted adaptively to minimize the noise in the equalized signal, subject to the accurate equalization of the channel. The latter equalizer is usually easier to adjust close to its ideal setting, for both timeinvariant and time-varying channels.The paper compares the tolerances to additive white Gaussian noise of the two equalizers, for the particular application of digital data transmission at 9600 bit/s over telephone circuits. Theoretical analysis is used to compare the equalizers, first for the case where there is a very high signal/noise ratio, and then for the case where the channel introduces pure phase distortion. Computer-simulation tests over models of six different telephone circuits are used to compare the equalizers for more general situations where the signal/noise ratio is not very high and where there is amplitude distortion in the received signal.
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Obituary. Graham John Scoles
Book review: A History of The Institution of Electrical Engineers 1871–1971
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