1981-11-02
1984-04-10
Atkinson, Charles E.
Excavating
360 341, 371 57, G06F 1108
Patent
active
044425201
ABSTRACT:
Apparatus for example for use in achieving correct field framing on reproduction of a digital PAL television signal from a video tape recorder, by correcting errors in an input square-wave signal which signal alternates between first and second levels every four fields of the television signal, the apparatus comprising first and second similar counters to be supplied with the input signal so as to be enabled to count when the input signal is of the first and said second level respectively, means to detect errors in the input signal and thereupon to supply a signal to disable both the first and second counters, a clock pulse source for supplying a clock pulse signal of high frequency relative to the frequency of the input signal to the first and second counter, and a bistable circuit arranged to be triggered to a first stable condition by an overflow signal from the first counter and to a second stable condition by an overflow signal from the second counter, whereby the bistable circuit supplies a corrected replica of the input signal.
REFERENCES:
patent: 3405235 (1968-10-01), Carter
patent: 3573729 (1971-04-01), Gunn et al.
patent: 3610819 (1971-10-01), Thompson
patent: 3783383 (1974-01-01), Forster et al.
patent: 3886522 (1975-05-01), Barton et al.
patent: 4070646 (1978-01-01), Sandlin
patent: 4244052 (1981-01-01), Hemsworth
patent: 4309694 (1982-01-01), Henry
Ive John G. S.
Thirlwall Alan C.
Atkinson Charles E.
Eslinger Lewis H.
Sinderbrand Alvin
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