Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 2, 24 January 1974
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Volume 10, Issue 2
24 January 1974
Generation of simple paths of graph by decomposition
- Author(s): I. Cahit and R. Cahit
- Source: Electronics Letters, Volume 10, Issue 2, p. 13 –14
- DOI: 10.1049/el:19740009
- Type: Article
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The letter presents a method for the generation of simple paths by decomposing the given graph into two subgraphs. In this way, the simple specific subpaths can be found simultaneously in the subgraphs and their unions of Cartesian products give the desired original simple paths.
Jump phenomenon in digital filters
- Author(s): L. Kristiansson
- Source: Electronics Letters, Volume 10, Issue 2, p. 14 –15
- DOI: 10.1049/el:19740010
- Type: Article
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Owing to the nonlinear behaviour of the adders in a digital filter, certain phenomena such as limit cycles and jumps may occur. The possibility of the jump phenomenon occurring in digital filters is studied. Sufficient conditions for a special 2nd-order filter are given.
Whispering-gallery rays within dielectric circles and spheres
- Author(s): A.W. Snyder and D.J. Mitchell
- Source: Electronics Letters, Volume 10, Issue 2, page: 16 –16
- DOI: 10.1049/el:19740011
- Type: Article
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The attenuation of rays propagating at nearly grazing incidence within lossless dielectric circles and spheres is given. There are no trapped rays, no matter how great the refractive index of the structure; however, many rays are only very weakly attenuated. These are the ‘leaky rays’ that are predicted, incorrectly, by Fresnel's laws to be trapped.
F.M. click rates
- Author(s): J.H. Roberts
- Source: Electronics Letters, Volume 10, Issue 2, p. 16 –17
- DOI: 10.1049/el:19740012
- Type: Article
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The letter presents a different view to that customarily adopted, and calculates the expected number of clicks per second at the output of an f.m. detector. It is shown how the above-threshold expression for the instantaneous frequency can be used in a very general result, from which the click-rate formulas given earlier by Rice for modulated carriers can be simply obtained.
Finite-difference equations in circular-waveguide coupling problems
- Author(s): G. Falciasecca
- Source: Electronics Letters, Volume 10, Issue 2, p. 18 –19
- DOI: 10.1049/el:19740013
- Type: Article
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A numerical method is developed to verify perturbation results in imperfect-circular-waveguide computations, and some results are presented for the most critical cases. Conclusions encourage both the perturbation solution and the proposed numerical solution by finite-difference equations.
Application of digital lineariser with cycle counter to thermocouples
- Author(s): Dragan Pantić
- Source: Electronics Letters, Volume 10, Issue 2, p. 19 –21
- DOI: 10.1049/el:19740014
- Type: Article
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The lineariser corrects the reading of digital thermometer by omitting, in cycles, some pulses entering the counter of the thermometer, and hence decreasing the reading by one digit each time a pulse is omitted. The lengths of cycles in which a pulse is omitted are shorter, as the number accumulated in the counter increases, and correct the non-linearity of the thermocouple.
Method of phase-modulating signals in optical fibres: application to optical-telemetry systems
- Author(s): D.E.N. Davies and S. Kingsley
- Source: Electronics Letters, Volume 10, Issue 2, p. 21 –22
- DOI: 10.1049/el:19740015
- Type: Article
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By attaching a piezoelectric transducer that modulates the mechanical tension over a short section of fibre, signals in optical fibres are phase modulated. The technique is applicable to a I-way optical-telemetry system.
Phase shifter with high amplitude accuracy
- Author(s): G. Dehmel and D. Lukoschus
- Source: Electronics Letters, Volume 10, Issue 2, p. 22 –23
- DOI: 10.1049/el:19740016
- Type: Article
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A phase shifter for the audio and subaudio range has been built that keeps the amplitude deviation within ±0.4%. The phase angle can be varied between 0 and approximately 180°, with infinite resolution.
Transformation of time-varying autonomous systems to companion form
- Author(s): S. Puri ; H. Singh ; M. Lal
- Source: Electronics Letters, Volume 10, Issue 2, page: 24 –24
- DOI: 10.1049/el:19740017
- Type: Article
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A method of generating matrices N(t) for transforming a linear multivariable time-varying system to the companion form has been given. In some cases, the transformation matrix could be made time invariant.
Erratum: Ambient-temperature effects in transferred-electron amplifiers
- Author(s): G.S. Hobson
- Source: Electronics Letters, Volume 10, Issue 2, page: 24 –24
- DOI: 10.1049/el:19740018
- Type: Article
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