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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 12, Issue 20, 30 September 1976

Volumes & issues:

Volume 12, Issue 20

30 September 1976

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Pleochroic dyes with high-order parameters for liquid-crystal displays
Real-time areagraph of continuous speech for analysis and speech training
  • Author(s): F. Fallside  and  S. Brooks
  • Source: Electronics Letters, Volume 12, Issue 20, p. 515 –516
  • DOI:  10.1049/el:19760392
  • Type: Article
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  • p. 515 –516 (2)
    As an alternative to the spectrograph technique for speech analysis, an areagraph technique is presented in which the instantaneous vocal-tract area function (derived from linear prediction analysis) is plotted against time with distance along the tract as the y-ordinate and area denoted by intensity modulation. Since the display is related to a physical quantity, it has a number of advantages over the spectrograph. An application to speech training is described.
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Implementation of linear programming with a digital stochastic computer
  • Author(s): P. Mars  and  H.R. Mclean
  • Source: Electronics Letters, Volume 12, Issue 20, p. 516 –517
  • DOI:  10.1049/el:19760393
  • Type: Article
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  • p. 516 –517 (2)
    The problem of online computation of linear-programming problems with digital-stochastic-computing structures is considered. Such techniques are shown to provide very economical and fast online computations. The simple logic-circuits used for the realisation of the stochastic operators are ideally suited for large-scale integrated-circuit fabrication. Experimental results are presented for the stochastic computation of linear programming with an algorithm based on steepest-descent techniques.
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Wideband electronic tuning of s.a.w. devices
Stable spectral estimates with maximum entropy estimation
Simple rotation procedure for a graphical display system
Simple 2-GaAs-read-diode-oscillator power-combiner module
Experimental investigation of parametric sideband amplification in injection lasers
Error reduction by linear constraints in recursive identification
Second breakdown in high-voltage switching transistors
Measurement of heat-flow resistance in BARITT diodes
Magnetoresistive power controller with zero voltage drop
Crosspolarisation in beam-waveguide feeds
  • Author(s): A.B. Harris  and  B. Claydon
  • Source: Electronics Letters, Volume 12, Issue 20, p. 529 –531
  • DOI:  10.1049/el:19760403
  • Type: Article
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  • p. 529 –531 (3)
    The theory of the propagation of Gaussian beams has recently been developed to take account of the higher-order cross-polarised modes generated by offset curved reflectors, as used in beam waveguides. A comparison between results obtained by this analytical approach and by numerical computation of the diffraction integrals shows excellent agreement, confirming the relevance of the idealised theory to beam waveguides of finite dimensions with practical feedhorns.
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Electrical characterisation of transferred-electron devices
Closed-system approach for a class of dissipative dynamical systems
Measurement of the settling time of a v.c.o. by varying the repetition rate of a square-wave generator
  • Author(s): L.H. Holway  and  J.A. Mullen
  • Source: Electronics Letters, Volume 12, Issue 20, p. 534 –536
  • DOI:  10.1049/el:19760406
  • Type: Article
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  • p. 534 –536 (3)
    A steady-state method of measuring the transient settling time of a fast-tuning v.c.o. is described in which the control voltage is generated by a square-wave generator. The output function is effectively a trapezoidally modulated f.m. signal whose shape and spectral distribution of power depends on the settling time. The power intercepted by a 3rd-order Butterworth filter is calculated for several values of the settling time.
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F.E.T. mixer with the drain l.o. injection
Microbending loss in single-mode W-fibres
Parametric downconvertor (6 to 4 GHz) for satellite ground-station applications
Program design, abstract machines and the design engineer
Symmetry conditions for vestigial sideband systems
  • Author(s): W. Saraga
  • Source: Electronics Letters, Volume 12, Issue 20, p. 541 –542
  • DOI:  10.1049/el:19760411
  • Type: Article
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  • p. 541 –542 (2)
    It is well known that in vestigial-sideband (v.s.b.) systems a flat overall amplitude response is ensured by imposing the symmetry conditions A(ωc+ω)+A(ωc−ω)=1 and β(ωc+ω)+β(ωc−ω)=2β(ωc) on the amplitude response A(ω) and the phase response β(ω) of the v.s.b. filtering arrangements between the transmit and the receive modulator of the v.s.b. system, together with the system condition βc2−βc1=−β(ωc), where ωc/2π is the common carrier frequency and βc1 and βc2 are the phase angles of the transmit and the receive carrier, respectively. In the letter, it is shown that these conditions, although sufficient, are not necessary, and a second set of sufficient conditions is presented: A2(ωc+ω)+A2(ωc−ω)=1; β(ωc+ω)+β(ωc−ω)=2β(ωc); βc2−βc1=±¼π−β(ωc) or =±¾π−β(ωc). The implications of the existence of two alternative sets of sufficient conditions are discussed.
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Green's function for determining transverse e.m.-field components from the radial components
Erratum: Implementation of some ternary operators with c.m.o.s. integrated circuits
Erratum: Computation of time-domain response of URC networks

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