Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 20, 4 October 1968
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Volume 4, Issue 20
4 October 1968
Microcircuit learning nets: improved recognition by means of pattern feedback
- Author(s): I. Aleksander and E.H. Mamdani
- Source: Electronics Letters, Volume 4, Issue 20, p. 425 –426
- DOI: 10.1049/el:19680333
- Type: Article
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p.
425
–426
(2)
Pattern feedback is a new concept in learning networks of adaptive microcircuits. The net is trained to produce a model output pattern. During use, the output patterns are fed back to the input. Recognition of an input pattern takes place if a stable model output pattern is generated.
Transient neutral depletion in a constricted low-pressure mercury discharge measured by ultraviolet absorption
- Author(s): J.E. Aitken and K.F. Sander
- Source: Electronics Letters, Volume 4, Issue 20, page: 426 –426
- DOI: 10.1049/el:19680334
- Type: Article
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p.
426
(1)
The temporal variation of the density of neutral mercury atoms in the constriction of a pulsed mercury discharge has been measured during the passage of a 36A, 50 μs current pulse by the method of resonance radiation absorption. A depletion rising to a maximum of 82% has been detected.
Nonlinear behaviour of magnetostatic surface waves
- Author(s): N.J. Freedman and L.K. Brundle
- Source: Electronics Letters, Volume 4, Issue 20, p. 427 –428
- DOI: 10.1049/el:19680335
- Type: Article
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p.
427
–428
(2)
The higher-power behaviour of magnetostatic surface waves propagating at right angles to a magnetic bias field in a y.i.g. single-crystal slab has been investigated experimentally. The conditions for coincidence of the surface modes and the high-power subsidiary absorption are discussed.
Active RC filters with differential integrators
- Author(s): D. Wolff
- Source: Electronics Letters, Volume 4, Issue 20, p. 428 –429
- DOI: 10.1049/el:19680336
- Type: Article
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p.
428
–429
(2)
A method is described for synthetising active RC filters by using the subtraction property of differential operational amplifiers. The differential operational amplifiers used have infinite gain. The advantages of the filters are simple adjustments, low sensitivities and fewer amplifiers compared with analogue-computer circuits.
Microwave-biased photodetector system with an integral Gunn-effect oscillator
- Author(s): S.C. Bass ; D.V. Eddolls ; T.F. Knibb
- Source: Electronics Letters, Volume 4, Issue 20, p. 429 –430
- DOI: 10.1049/el:19680337
- Type: Article
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p.
429
–430
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A self-oscillating X band microwave-biased photoconductive detection system is described in which a Gunn-effect oscillator is situated within the photoconductor cavity. The detector performance is comparable with that of previous systems using external sources of microwave power as well as being considerably simpler.
Phase-compensation in electronic gyrator circuits
- Author(s): H.Th. van Looij and K.M. Adams
- Source: Electronics Letters, Volume 4, Issue 20, p. 430 –431
- DOI: 10.1049/el:19680338
- Type: Article
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p.
430
–431
(2)
A method is indicated for frequency-independent compensation of the internal phase shift in electronic gyrator circuits intended for inductance simulation. Application of the compensation technique to filter circuits is also indicated.
Wideband electronic gyrator circuit
- Author(s): H.Th. van Looij and K.M. Adams
- Source: Electronics Letters, Volume 4, Issue 20, p. 431 –432
- DOI: 10.1049/el:19680339
- Type: Article
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p.
431
–432
(2)
An electronic inductance-simulating gyrator circuit that is specially designed for application over a wide band of frequencies is described. Experiments with this circuit, that is phase-compensated according to a method described earlier by the authors, confirm the theory up to 17MHz. Stable operation up to 55 MHz has been achieved.
Instrumentation in duals and analogues
- Author(s): D.G.O. Morris
- Source: Electronics Letters, Volume 4, Issue 20, p. 432 –433
- DOI: 10.1049/el:19680340
- Type: Article
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p.
432
–433
(2)
The symbols for active and passive system elements may be supplemented by symbols for indicating the input and output quantities that are to be the subject of consideration. The correspondence in duals and analogues may then be determined by purely formal transformations.
Some results of electronic compensation for surface profile errors in parabolic reflectors
- Author(s): D.E.N. Davies and A.W. Rudge
- Source: Electronics Letters, Volume 4, Issue 20, p. 433 –434
- DOI: 10.1049/el:19680341
- Type: Article
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p.
433
–434
(2)
This letter describes the basic principles of a proposed system for compensating for the effect of surface profile errors in parabolic reflectors. It also describes some experimental results which verify the technical feasibility of the proposals and discusses some implications of its future development.
Voltage-transfer-function matrix realisation using operational amplifiers
- Author(s): S.K. Mitra
- Source: Electronics Letters, Volume 4, Issue 20, page: 435 –435
- DOI: 10.1049/el:19680342
- Type: Article
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p.
435
(1)
A new method of realising a voltage-transfer-function vector by means of an active network containing RC 1-ports and a single operational amplifier is presented.
Efficient application of D-Decomposition techniques to determine stability boundaries for multiparameter systems, with particular reference to induction machines
- Author(s): P.J. Lawrenson ; S.R. Bowes ; J.M. Stephenson
- Source: Electronics Letters, Volume 4, Issue 20, p. 435 –437
- DOI: 10.1049/el:19680343
- Type: Article
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p.
435
–437
(3)
It is shown that the technique of D-decomposition can be applied in a particular efficient way to synthetise parameter combinations defining stable conditions in multiparameter systems. A range of results of value in connection with the steady-state stability of induction motors on variable-frequency supplies is presented.
Simple measurement of m.o.s.t. gain factor
- Author(s): B. Rowe
- Source: Electronics Letters, Volume 4, Issue 20, p. 437 –438
- DOI: 10.1049/el:19680344
- Type: Article
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p.
437
–438
(2)
M.O.S.T. characteristics may be described by two equations involving the current-gain factor and the turn-on voltage. The first parameter may be measured using only a capacitor, a switch and a few resistors; the second occurs during this measurement.
New class of pseudorandom ternary sequences
- Author(s): P.A.N. Briggs and K.R. Godfrey
- Source: Electronics Letters, Volume 4, Issue 20, p. 438 –439
- DOI: 10.1049/el:19680345
- Type: Article
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p.
438
–439
(2)
The crosscorrelation function between certain pairs of binary maximum-length sequences of the same period has only three levels. The method of formation of a class of these ternary crosscorrelation sequences is described, and some of the properties of the class are listed.
Control of linear systems with time delay
- Author(s): D.Q. Mayne
- Source: Electronics Letters, Volume 4, Issue 20, p. 439 –440
- DOI: 10.1049/el:19680346
- Type: Article
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p.
439
–440
(2)
Luenberger's procedure for the design of controllers of linear systems with inaccessible state vectors is extended to deal with time-delay systems.
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