Period measuring device

Details Period measuring device Period measuring device

1994-08-16

1996-01-23

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

377 55, 327265, G01R 2310

Patent

active

054870976

ABSTRACT:
It is an object to accurately obtain the period of the horizontal synchronizing signal in the video signal. The number of internal pulses are measured in a predetermined measurement period defined by the horizontal synchronizing signal. It is assumed that the periods of the horizontal synchronizing signal and the internal pulse are denoted as T.sub.H and T.sub.S, and the measurement period is defined by one period of a divided signal NS which is obtained by N-dividing the horizontal synchronizing signal. In this case, the length of the measurement period is N.multidot.T.sub.H. The period of the horizontal synchronizing signal is obtained when the internal pulse is activated K times in the measurement period. After the measurement period is started, the divided signal NS transits between the Kth activation of the internal pulse and the (K+1)th activation, and the measurement period is ended. Accordingly, there is the relation of T.sub.S .multidot.K<N.multidot.T.sub.H <T.sub.S .multidot.(K+1). The error .epsilon.=T.sub.S /N, where the error .epsilon. dose not increase even if the period T.sub.H of the horizontal synchronizing signal becomes long.

REFERENCES:
patent: 3745475 (1973-07-01), Turner
patent: 3878370 (1975-04-01), Santomango et al.
patent: 4001561 (1977-01-01), Quaintance
patent: 4085373 (1978-04-01), McConnell
patent: 5382910 (1995-01-01), Walsh

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