Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 1, 12 January 1968
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Volume 4, Issue 1
12 January 1968
Selective properties of digital filters obtained by convolution approximation
- Author(s): R. Vích
- Source: Electronics Letters, Volume 4, Issue 1, p. 1 –2
- DOI: 10.1049/el:19680001
- Type: Article
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The construction of a sequence of transfer functions of digital filters by means of various approximations in the time domain is shown. By means of an example, the frequency properties of attenuation and phase are discussed for four terms of this sequence.
Comments on ‘Method of evaluating time-weighted performance integrals’
- Author(s): H.M. Power
- Source: Electronics Letters, Volume 4, Issue 1, p. 3 –4
- DOI: 10.1049/el:19680002
- Type: Article
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Computational aids for evaluation of the time-weighted performance integral Jk = ∫∞0tkf(t)dt by means of a recently introduced Laplace-transform technique are discussed. A general method is developed for numerical evaluation of high-order derivatives of rational functions.
Products of generalised functions
- Author(s): R.F. Hoskins
- Source: Electronics Letters, Volume 4, Issue 1, p. 4 –5
- DOI: 10.1049/el:19680003
- Type: Article
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In certain circumstances it is possible to attach a meaning to the product of generalised functions. Where delta functions are concerned, this results in clarification of issues raised in sampling theory, etc.
Radar propagation factors for various linear and circular polarisations
- Author(s): M.W. Long
- Source: Electronics Letters, Volume 4, Issue 1, p. 5 –6
- DOI: 10.1049/el:19680004
- Type: Article
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The propagation factor, introduced into the radar equation to account for forward scattering from the Earth, depends on polarisation. Equations are given that express the propagation factors for circular polarisations in terms of those for linear polarisations.
Performance index based on the correlation between the responses of two systems
- Author(s): B. Sarkar
- Source: Electronics Letters, Volume 4, Issue 1, p. 6 –7
- DOI: 10.1049/el:19680005
- Type: Article
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In the analytical design theory of linear control Systems, an integral-square-error performance index for transient signals and a mean-square-error performance index for stochastic signals are commonly used. It is possible to define a new performance index based on the correlation between the responses of two systems. The response of one of the systems can be regarded as the desired response. This system can be termed the reference system.
Triangular-and trapezium-waveform oscillators for wideband electronic control of frequency
- Author(s): F.H. Wells and C. Sharpe
- Source: Electronics Letters, Volume 4, Issue 1, p. 7 –8
- DOI: 10.1049/el:19680006
- Type: Article
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The design of a new oscillator circuit capable of electronic control and gating over a wide frequency range and giving a waveform of low harmonic content is described. It is shown that the use of a symmetrical triangular shape followed by truncation of the peaks gives a powerful new approach to wideband oscillator design, from very low frequencies up to 25 MHz and resulting in zero, 2nd, 3rd and 4th harmonics.
Eigenvalue and control-law trajectories for a turboalternator model under fault conditions
- Author(s): H. Nicholson
- Source: Electronics Letters, Volume 4, Issue 1, p. 9 –12
- DOI: 10.1049/el:19680007
- Type: Article
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Previous work, concerned with the performance of a nonlinear turboalternator model operating with excitation and speeder-motor control developed from an equivalent linearised-model sequence, is extended to study the eigenvalue and control-law trajectories existing under short-circuit-fault conditions. The study provides a more detailed understanding of the dynamics of the machine system during transient conditions and will form a basis for obtaining an improved overall system design.
Light modulation at video frequencies
- Author(s): A.J. Fox and J.R. Mansell
- Source: Electronics Letters, Volume 4, Issue 1, page: 12 –12
- DOI: 10.1049/el:19680008
- Type: Article
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Factors affecting the operation of the transverse a.d.p. modulator are discussed. A modulator is described which incorporates a halfwave plate to improve temperature stability and extinction ratio. The modulator has a halfwave voltage of 250 V, a bandwidth of 3.3 mHz and an extinction ratio of 160:1.
Anomalous effect in a lithium-drifted germanium semiconductor detector
- Author(s): G. Walford and C.E. Doust
- Source: Electronics Letters, Volume 4, Issue 1, page: 13 –13
- DOI: 10.1049/el:19680009
- Type: Article
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After the installation of a lithium-drifted germanium [Gel (Li)] gamma-ray detector in a vacuum cryostat at 77°K, a negative differential resistance was observed that was stable and measurable using d.c. methods. This letter describes the results and measured characteristics obtained so far.
Dispersive filter in a control loop
- Author(s): E.L.R. Webb
- Source: Electronics Letters, Volume 4, Issue 1, p. 13 –14
- DOI: 10.1049/el:19680010
- Type: Article
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The effect of a distributed-RC filter or transmission line on the behaviour of a control system is examined, and a useful model for a class of proportional temperature controllers is derived.
Low-Noise l.f. amplification using a transistor chopper
- Author(s): P.J. Baxandall
- Source: Electronics Letters, Volume 4, Issue 1, p. 14 –15
- DOI: 10.1049/el:19680011
- Type: Article
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Reasons are given for the belief that the use of a transistor chopper, to make a low-frequency low-noise amplifier, should make possible the achievement of an exceptionally good noise performance. Two methods are proposed for gating out the noise produced by the chopper during switching edges.
Possible Gunn-effect parametric amplifier
- Author(s): C.S. Aitchison
- Source: Electronics Letters, Volume 4, Issue 1, p. 15 –16
- DOI: 10.1049/el:19680012
- Type: Article
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It is proposed that the moving domain in a Gunn-effect sample can be regarded as a pumped capacitor and that this can be used to form a single d.c.-pumped parametric amplifier. The idling current can be supported in the resonance provided by the encapsulation. The figure of merit is calculated.
Optimal use of partial redundancy and the system reliability which results
- Author(s): Theresa Klaschka
- Source: Electronics Letters, Volume 4, Issue 1, p. 16 –18
- DOI: 10.1049/el:19680013
- Type: Article
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Partial system triplication with a single majority vote is analysed to find (a) the region of superiority of partial triplication over total triplication and (b) over no redundancy, (c) the degree of partial triplication which maximises reliability, (d) the maximum system reliability produced by partial redundancy. Only approximate or numerical solutions to (a) and (c) have appeared previously. (b) and (d) are entirely new.
Steady-state stability of the doubly fed synchronous machine
- Author(s): R.D. Jackson and B.W. Phillips
- Source: Electronics Letters, Volume 4, Issue 1, p. 18 –19
- DOI: 10.1049/el:19680014
- Type: Article
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The eigenvalues of the linearised equations describing a variable-speed doubly fed synchronous machine are examined to establish steady-state stability boundaries. A limited range of results is confirmed by experiments using a wound-rotor machine fed from the mains and from a cycloconvertor.
Pulsed frequency-response calculations for a digital control system
- Author(s): R. Edwards
- Source: Electronics Letters, Volume 4, Issue 1, p. 19 –21
- DOI: 10.1049/el:19680015
- Type: Article
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A method for digital-computer calculation of the pulsed real frequency-response function of a continuous system is presented. The approach, via the discrete transition matrix, provides programming generality and avoids the algebraic manipulation inherent in the direct transformation approach. An application of the technique is to the design of digital and sampled-data control systems by frequency-domain methods.
Stability of p.c.m.-oscillator control systems
- Author(s): P.C. Parks and M.R. Miller
- Source: Electronics Letters, Volume 4, Issue 1, page: 21 –21
- DOI: 10.1049/el:19680016
- Type: Article
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An extension of existing techniques allows a proof of the stability of two classes of linear oscillator control system for use in integrated p.c.m. systems. Stability is shown to depend on the response of various filters used in the system in a manner which should be easily realisable in a practical network.
Erratum: Topological formulas for 4-terminal nonreciprocal constraints
- Author(s): K. Brown
- Source: Electronics Letters, Volume 4, Issue 1, page: 22 –22
- DOI: 10.1049/el:19680017
- Type: Article
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Erratum: Performance of feedback systems with nonlinear phase-advance compensators to Gaussian inputs
- Author(s): R. Balasubramanian and D.P Atherton
- Source: Electronics Letters, Volume 4, Issue 1, page: 22 –22
- DOI: 10.1049/el:19680018
- Type: Article
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