Television receiver with high voltage protection circuit

Details Television receiver with high voltage protection circuit Television receiver with high voltage protection circuit

1984-01-23

1985-10-01

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3581931, 358158, H04N 568, H04N 544, H03L 700

Patent

active

045449546

ABSTRACT:
A high voltage generator in a television receiver responds to horizontal deflection rate signals from a horizontal oscillator which normally responds to a horizontal sync signal derived from the television signal. A sync validity detector provides a control signal indicative of the validity of the horizontal sync signal to an electronic tuning system in order to identify active channels, and to the deflection system to inhibit the response of the deflection system to false sync signals otherwise capable of causing the oscillator to operate a lower frequency likely to cause the high voltage generator to develop an excessively high voltage.

REFERENCES:
patent: 4147964 (1979-04-01), Luz et al.
patent: 4253121 (1981-02-01), Avery
patent: 4345275 (1982-08-01), Waybright
patent: 4390902 (1983-06-01), Chin et al.
patent: 4398303 (1983-08-01), Chin et al.
Copending, concurrently filed U.S. patent application Ser. No. (573,228) of K. J. Chen titled "Video Sync Validity Detector".

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