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Electrical Engineers, Proceedings of the Institution of

Issue 8 • Date August 1976

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Displaying Results 1 - 21 of 21
  • Calculation of capacitance of adjacent steps in parallel-plane transmission lines

    Publication Year: 1976, Page(s):729 - 733
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (479 KB)

    Explicit solutions are presented for the capacitance arising from the electric field distortion caused by one of two step discontinuities bounding a short length of increased or decreased conductor spacing in parallel-plane transmission lines. Values are tabulated of a proximity factor which may be multiplied by the capacitance resulting from the field distortion associated with an isolated step t... View full abstract»

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  • Extending the application potential of low-frequency correlators

    Publication Year: 1976, Page(s):734 - 736
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (227 KB)

    This paper presents a simple technique for eliminating the need for a post-delay line low-pass filter in a low-frequency correlator. A bucket-brigade delay line is used in a dual capacity giving the correlator a wider application. View full abstract»

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  • Design and performance of synchroniser for switching satellite

    Publication Year: 1976, Page(s):737 - 742
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (609 KB)

    A laboratory model synchroniser for the earth station of a switching satellite system is described and its performance is compared with theoretical predictions. The results included in the paper confirm the pertinent theory through measurements made on the model operating in its coarse-search mode, fine-search mode and tracking mode. View full abstract»

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  • Entropy of delta-coded speech

    Publication Year: 1976, Page(s):743 - 751
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1102 KB)

    The paper presents an analysis of the information properties of delta-coded speech with channel-encoding applications. Predictive coding techniques for reducing the entropy of the average distribution of the signal elements are described, and evaluated by comparison with computations of the relative entropy of Markov process approximations to the message-generating process, for orders up to 9. The... View full abstract»

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  • Signal detection of delta-coded speech

    Publication Year: 1976, Page(s):752 - 755
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (405 KB)

    A signal detection method for delta-coded speech is presented which exploits the redundancy of the source to reduce the error rate owing to additive Gaussian noise in the channel. The method implements a Bayes strategy with dual decision boundaries selected by a 6th-order digital predictor. Fixed decision boundary pairs, appropriate for a wide range of input signal/noise ratio, are established. Th... View full abstract»

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  • Efficient computer-computer communication

    Publication Year: 1976, Page(s):756 - 760
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (644 KB)

    The study considers the effect of error rate, block length, transmission delay, and error-recovery mechanism on the efficiency of the communications channel in computer-computer communications. The systems investigated are full-duplex communications with unlimited and limited buffering, and half-duplex communications. Both random and burst errors are considered. For all cases, over a significant r... View full abstract»

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  • Technique for improving the pull-in characteristics of phase-locked loops

    Publication Year: 1976, Page(s):761 - 764
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (507 KB)

    This paper describes a simple circuit for improving the pull-in capability and capture time performance of second-order phase-locked loops without degrading the noise rejection properties of the loop. Experimental results are presented for several values of loop damping factor and natural frequency. View full abstract»

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  • Diversity measurements of attenuation at 37 GHz with sun-tracking radiometers in a 3-site network

    Publication Year: 1976, Page(s):765 - 769
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (734 KB)

    The results of a site-diversity experiment at 37 GHz with sun-tracking radiometers at three sites 10.3, 12.7 and 18 km apart, near Slough, UK, are described in relation to Earth-space communication links. Data for observation periods of 16, 8 and 9 months from the three pairs of sites are presented in the form of cumulative distributions and of diversity advantage as a function of attenuation, tog... View full abstract»

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  • Surface-acoustic-wave matched filters for multifrequency shift keyed communication systems

    Publication Year: 1976, Page(s):770 - 774
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (915 KB)

    This paper describes the design, fabrication and assessment of twelve s.a.w. matched filters on ST-quartz used to demodulate data in a four-level f.s.k. system. The system uses four frequencies separated by 250 kHz around 70 MHz, and the pulse length (4, 12, or 36 ¿s) may be selected according to the input signal/noise ratio to ensure reliable detection of the matched filter outputs. A 12 ¿s tra... View full abstract»

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  • Results for a loop network with a hybrid message-handling protocol

    Publication Year: 1976, Page(s):775 - 776
    IEEE is not the copyright holder of this material | PDF file iconPDF (285 KB)
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  • Use of sampling ambiguity in convertor firing control systems

    Publication Year: 1976, Page(s):777 - 780
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (439 KB)

    In a previous paper it was demonstrated that considerable reduction in the harmonic content of a circulating current cycloconvertor could be obtained by regularly sampling the reference waveforms which control the firing of the thyristors. The paper describes how this sampling process also allows the reference waves, needed for a cycloconvertor with a multiphase output, to be produced from a singl... View full abstract»

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  • Electrical noise generated by thyristor control

    Publication Year: 1976, Page(s):781 - 786
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1021 KB)

    The possible sources of the electrical noise generated by thyristor circuits is discussed, and the results of an investigation to determine the relative importance of the noise sources are presented. The influence of cycle-to-cycle variations in the a.c. supply-voltage amplitude and period is considered in detail. It is established that the most significant effect which produces noise at the highe... View full abstract»

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  • Damping and screening in the synchronous superconducting generator

    Publication Year: 1976, Page(s):787 - 794
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1073 KB)

    A study of the screening and damping properties of superconducting a.c. generators shows that a single screen is unlikely to provide both adequate screening and damping. The double screen gives improved performance but is subject to degradation of both properties because of interactions between the screens. An effective means of improvement is suggested and discussed. View full abstract»

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  • Measurement of rotor temperatures of a 500MW turbine generator with unbalanced loading

    Publication Year: 1976, Page(s):795 - 803
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1295 KB)

    The paper describes tests made on a large turbine generator to determine the effects of unbalanced stator currents on rotor surface heating. The method of testing is described, and results are given for both continuous and transient unbalanced loading. It is shown that certain points on the rotor can be subjected to unacceptably high temperatures for what were previously considered modest levels o... View full abstract»

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  • Induction-motor terminal-voltage equations

    Publication Year: 1976, Page(s):804 - 810
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (923 KB)

    Induction-motor terminal equations are derived which are valid for both steady-state and dynamic analysis. The equations take into consideration harmonic fields owing to windings concentrated in slots and to the fringing produced by the slots. It is shown that, when specific harmonics are neglected, the complete model may be reduced to commonly used simplified models. The method of analysis overco... View full abstract»

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  • Transient voltages and currents in series-compensated e.h.v. lines

    Publication Year: 1976, Page(s):811 - 817
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1021 KB)

    The paper deals with electromagnetic transient phenomena in series-compensated lines. The most common schemes for series and shunt-compensation are considered. The first part of the paper presents the results of a study done on a t.n.a. This includes the analysis of dropping faulted lines, extinction of the secondary arc-currents, re-energisation of the lines, and fast reinsertion of the capacitor... View full abstract»

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  • Determination of synchronous-machine phase-co-ordinate parameters

    Publication Year: 1976, Page(s):818 - 824
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (852 KB)

    Test and analytical procedures are described for the determination of synchronous-machine phase¿co-ordinate parameters. The methods proposed are based on least-squares theory applied to the voltage and current waveforms and the Fourier analyses of these waveforms arising from open circuit and steady-state 3-phase short-circuit and single-phase-to-earth tests. The computed machine performance usin... View full abstract»

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  • Multiplex cyclic commutation and its applications

    Publication Year: 1976, Page(s):825 - 830
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (828 KB)

    It is shown how a rotating set of N circumferentially transposing links can connect N stator inputs commutatively to N stator outputs: thus replacing at least N2 switch contacts and N moving parts (or the equivalent number of relays or solid-state switches) by 2N contacts and a single moving part. The same algorithm permits a set of N rotating contacts, sharing a common track, to retain one-to-one... View full abstract»

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  • Exact transfer-function design using output feedback

    Publication Year: 1976, Page(s):831 - 834
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (454 KB)

    This paper considers the problem of matching exactly the transfer-function matrix of a given system to that of a desired model using output feedback. Necessary and sufficient conditions are established for exact matching, the problem being reduced to that of solving a linear system of equations. These results cover the general case where the transfer-function matrices of the given system are nonsq... View full abstract»

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  • Computer modelling and control of manufacturing systems with particular reference to the tailoring industry

    Publication Year: 1976, Page(s):835 - 842
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (927 KB)

    There is considerable potential for computers integrated in the manufacturing process at factory and shop-floor level. In particular, owing to their current low price, minicomputers are attractive for use in realtime interactive computer-aided control systems where the supervisory staff are a significant part of the control system. Computers tend to have a low-level of application in a systems eng... View full abstract»

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  • Standard error of the mark for an examination paper in electronic engineering

    Publication Year: 1976, Page(s):843 - 844
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (253 KB)

    Experiments were undertaken to check an earlier estimate of the standard error of the mark for an examination paper. In each experiment, candidates were set two parallel papers. Each paper of the pair was prepared, and the scripts were marked, by the same team of examiners. Both papers were set under examination conditions. Eleven such experiments were conducted, involving 573 pairs of scripts. Th... View full abstract»

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Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

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