Method of automatically measuring the horizontal scan frequency

Details Method of automatically measuring the horizontal scan frequency Method of automatically measuring the horizontal scan frequency

1990-12-21

1992-07-28

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358140, H04N 508, H04N 504, H04N 701

Patent

active

051344815

ABSTRACT:
A method of automatically measuring the horizontal scan frequency of a composite synchronism signal, comprising horizontal synchronization impulses at line frequency, consists of first performing a count of a number of impulses having a repeat frequency higher than said line frequency, as intervening between two successive impulses at line frequency.
The count value, corresponding to said number of impulses, is stored to obtain the line frequency of the signal, and thereafter, a series of down counts is effected, as initiated at predetermined times, until a change of frequency of the signal is detected.

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