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Browse Journals & Magazines > Electrical Engineers, Proceed ...> Volume:115 Issue:3 Help

Subjective quality of television pictures impaired by sinewave noise and low-frequency random noise

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2 Author(s)
Allnatt, J.W. ; General Post Office, Research Station, London, UK ; Bragg, E.J.W.

Transistorised amplifiers for video transmission over coaxial cables incorporate power units with d.c.-d.c. convertors that produce an aggregate effect similar to that of band-limited random noise at low frequency. The subjective effect of such noise, centred at 3.2 and at 7.5kHz, has been investigated. Tests were also made with sinewave noise at the frequencies giving the worst effect in the regions of 1 and 3.2kHz and 1 and 3.2MHz. Results are summarised in the form of signal/noise ratios for a series of `imp¿ mark points that has recently been introduced.

Published in:
Electrical Engineers, Proceedings of the Institution of  (Volume:115 ,  Issue: 3 )

Date of Publication: March 1968

Page(s):
371 - 375
ISSN :
0020-3270
Digital Object Identifier :
10.1049/piee.1968.0069
Product Type:
Journals & Magazines
Date of Current Version :
26 January 2010
Issue Date :
March 1968

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