Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 7, Issue 23, 18 November 1971
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Volume 7, Issue 23
18 November 1971
Node-pair transformation matrices
- Author(s): V.V. Bapeswara Rao
- Source: Electronics Letters, Volume 7, Issue 23, page: 677 –677
- DOI: 10.1049/el:19710461
- Type: Article
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p.
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Necessary and sufficient conditions for a matrix, in which each row corresponds to a seg, to be node-pair transformation matrix are given.
Transmission-delay control of radio links in a mutually synchronised p.c.m. network
- Author(s): F.G. Johannesen
- Source: Electronics Letters, Volume 7, Issue 23, p. 677 –678
- DOI: 10.1049/el:19710462
- Type: Article
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In a mutually synchronised p.c.m. network, the relatively fast transmission-delay variations of radio links may restrict the use of such links. To overcome this problem, a method is proposed in which the delay is automatically compensated using an inherent facility of a typical hybrid-modulated radio link.
Characteristic impedance measurements of a coplanar waveguide
- Author(s): H. Matino
- Source: Electronics Letters, Volume 7, Issue 23, p. 678 –679
- DOI: 10.1049/el:19710463
- Type: Article
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–679
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A coplanar waveguide which consists of a strip of metallic thin film on the surface of a dielectric slab with two ground electrodes running adjacent and parallel to the strip is easily accessible for shunt connections of semiconductor devices. This letter presents experimental data, and a theoretical equation including correction factors, for an effective relative permittivity concerning characteristic impedance. The measurements have been made by the t.d.r. method.
Precision voltage-divider circuit
- Author(s): B.L. Hart
- Source: Electronics Letters, Volume 7, Issue 23, p. 679 –680
- DOI: 10.1049/el:19710464
- Type: Article
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A base-current-cancellation scheme is used to improve the performance of a previously discussed class of transistor voltage-divider circuits having small source loading, low output resistance and low temperature coefficient. The technique described is suitable for use with Zener-diode reference sources in voltage-regulator circuits and analogue-digital convertors.
Calculation of Fourier coefficients of a function given at a set of arbitrary points
- Author(s): R. Piessons
- Source: Electronics Letters, Volume 7, Issue 23, p. 681 –682
- DOI: 10.1049/el:19710465
- Type: Article
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A numerical method is presented for the calculation of Fourier coefficients of a function which is given at a discrete set of arbitrary points. The function is approximated by a sum of Cheby̅shev polynomials. This is performed by Clenshaw's method of curve fitting, which is a least-squares method. The Cheby̅shev coefficients are then used to construct linear combinations of Bessel functions, which are very good approximations of the Fourier coefficients.
Transmission matrix of a class of discrete-time systems
- Author(s): D. Malah
- Source: Electronics Letters, Volume 7, Issue 23, p. 682 –683
- DOI: 10.1049/el:19710466
- Type: Article
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Some new properties of the transmission matrix of the class of scalar, linear, discrete-time-varying systems, of order m, which are totally m-controllable and totally m-observable, are found. The results can be applied to the design, in the time domain, of discrete-time-varying or time-invariant systems.
Gaussian beam as a bundle of complex rays
- Author(s): G.A. Deschamps
- Source: Electronics Letters, Volume 7, Issue 23, p. 684 –685
- DOI: 10.1049/el:19710467
- Type: Article
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It is observed that the function G(P)=eikr/r, where r is the distance from the observation point P to a fixed point having a complex location, represents the field of a Gaussian beam. This can be used to justify, without further computation, the application of formulas of ordinary optics to the transformation of beams through optical systems. It can also be used to solve very simply some problems of diffraction and scattering of Gaussian beams.
Skywave propagation over a multisection plane ground
- Author(s): J. Arnbak and J. Bach Andersen
- Source: Electronics Letters, Volume 7, Issue 23, p. 685 –686
- DOI: 10.1049/el:19710468
- Type: Article
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The ground-loss profile along the path of a skywave for a sectionally homogeneous ground is investigated by means of the compensation theorem. A recurrence procedure, which is suitable for numerical work, has been satisfactorily tested against recent experimental results concerning m.f. skywave propagation over a path in South-East England, extending to 300 wavelengths from the shore.
Optimum quadratic spectrum for complex BIFORE transform
- Author(s): K.R. Rao and N. Ahmed
- Source: Electronics Letters, Volume 7, Issue 23, p. 686 –688
- DOI: 10.1049/el:19710469
- Type: Article
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An optimum quadratic spectrum for the complex BIFORE transform, which is invariant to cyclic shift of the time series, is developed. The squared terms in this spectrum possess sequency resolution. The quadratic spectrum yields a better approximation to the d.f.t.energy spectrum compared with the sequency spectrum.
High-frequency fluid-conductivity measurement in microanalytical systems
- Author(s): J. Božičević ; F.M. Everaerts ; P. Pavelí ; TH.P.E.M. Verhaggen
- Source: Electronics Letters, Volume 7, Issue 23, p. 688 –689
- DOI: 10.1049/el:19710470
- Type: Article
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One of the obstacles to the extension of particular micro-analytical methods in chemistry lies in the lack of suitable measurement detectors. To overcome this problem, a new miniature detector for the detection and identification of fluids in a capillary tube is developed, which should improve certain methods of analysis.
Order determination in estimation of pulse transfer functions by method of moments
- Author(s): I.L. Campbell and R.F. Brown
- Source: Electronics Letters, Volume 7, Issue 23, p. 689 –691
- DOI: 10.1049/el:19710471
- Type: Article
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Given unbiased estimates of the moments of a sampled impulse-response function up to a given order, and given the standard deviations of the estimates, the bordering method of matrix inversion is shown to lead to a computationaily efficient method of determining the order of a pulse transfer function.
Fast economical binary divider
- Author(s): A.B. Gardiner
- Source: Electronics Letters, Volume 7, Issue 23, p. 691 –692
- DOI: 10.1049/el:19710472
- Type: Article
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–692
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By eliminating the shift operation of a shift-and-subtract divider, array dividers speed up division. Since n+1 subtractors are required, there is a heavy equipment cost. However, since each parallel subtraction is data dependent, the subtractions are sequential and only one subtractor is operating at any one time. Here a divider is developed which speeds division by eliminating the shift cycle, but which only requires two parallel subtractors working sequentially.
Metallic channels formed by high surface fields on GaAs planar devices
- Author(s): W.F. Fallman and H.L. Hartnagel
- Source: Electronics Letters, Volume 7, Issue 23, p. 692 –693
- DOI: 10.1049/el:19710473
- Type: Article
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–693
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Experimental finding are presented which show, among other results, that material migration also occurs along semi-insulating surfaces for GaAs planar devices.
Acoustic-surface-wave processor for hyperbolic f.m. signals
- Author(s): C. Atzeni and L. Masotti
- Source: Electronics Letters, Volume 7, Issue 23, p. 693 –694
- DOI: 10.1049/el:19710474
- Type: Article
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p.
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The design of an acoustic-surface-wave transversal filter for generation and processing of hyperbolic f.m. signals is described. The synthesis procedure consists in linear-modulating the spatial period of an interdigital array of tapping transducers on a piezoelectric substrate. Two interdigital configurations have been designed, the first operating at the fundamental frequency, the other at the overtone mode which allows the use of the minimum number of transducers.
New minimal-capacitor low-sensitivity RC-active synthesis procedure
- Author(s): W.B. Mikhael and B.B. Bhattacharyya
- Source: Electronics Letters, Volume 7, Issue 23, p. 694 –696
- DOI: 10.1049/el:19710475
- Type: Article
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p.
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–696
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A new low-sensitivity RC-active synthesis procedure is described which can be considered as an alternative to that of Antoniou in that the new method retains all the attractive features of his method. Further, this method uses the minimum number of capacitors which is frequently desirable for integrated circuits.
Acoustic convolution using nonlinear surface-wave interactions in a piezoelectric semiconductor
- Author(s): C.W. Turner ; I.M. Mason ; J. Chambers
- Source: Electronics Letters, Volume 7, Issue 23, p. 696 –697
- DOI: 10.1049/el:19710476
- Type: Article
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p.
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–697
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Experimental observations of nonlinear interactions in photo-conducting CdS are reported for oppositely travelling 17 MHz surface acoustic waves. The results for acoustic convolution and 2nd-harmonic generation indicate that the piezoelectric electron–phonon interaction may have important application to nonlinear signal-processing techniques employing surface waves.
Influence of Earth curvature on the subsurface electromagnetic fields of a line source
- Author(s): James.R. Wait
- Source: Electronics Letters, Volume 7, Issue 23, p. 697 –699
- DOI: 10.1049/el:19710477
- Type: Article
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The subsurface magnetic field produced by an oscillating line source of current on the Earth's surface is considered. Particular attention is given to evaluating the effect of non-flatness of the ground on the structure of the field at the buried receiving point. It is indicated that the wave-tilt ratio will still be a useful parameter in contemplated schemes for direction-finding in mine rescue operations.
Two-colour liquid-crystal display
- Author(s): G. Assouline ; M. Hareng ; E. Leiba
- Source: Electronics Letters, Volume 7, Issue 23, p. 699 –700
- DOI: 10.1049/el:19710478
- Type: Article
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–700
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A 7-segment numeric display with electrically controlled colour has been realised which uses the field-dependent birefringence in nematic liquid crystals. The colours obtained are very bright, especially the red and green.
Heuristic procedure for the reduction of finite-state machines
- Author(s): F.W.M. Stentiford and D.W. Lewin
- Source: Electronics Letters, Volume 7, Issue 23, p. 700 –702
- DOI: 10.1049/el:19710479
- Type: Article
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–702
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A practical technique for the reduction of large finite-state machines is proposed. The method is based on an empirical evaluation of the machine outputs.
Concise cellular array for multiplication and division
- Author(s): I. Deegan
- Source: Electronics Letters, Volume 7, Issue 23, p. 702 –704
- DOI: 10.1049/el:19710480
- Type: Article
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This letter describes how the combination of one of the simplest arithmetic cells and a new control–arithmetic cell can be used to form a versatile array for multiplication and division which uses fewer cells, and fewer gates per cell, than existing comparable arrays.
Erratum: Transmission parameters of a class of coupled distributed networks
- Author(s): K. Singhal and J. Vlach
- Source: Electronics Letters, Volume 7, Issue 23, page: 704 –704
- DOI: 10.1049/el:19710481
- Type: Article
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