Integrated circuit for television receivers comprising a sonic s

Details Integrated circuit for television receivers comprising a sonic s Integrated circuit for television receivers comprising a sonic s

1982-06-24

1985-03-19

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358154, 358158, 328139, H04N 508, H04N 510, H04N 700

Patent

active

045062978

ABSTRACT:
To prevent the separation-level shift occurring in the clamping circuit during the transmitted vertical synchronizing pulses or during prolonged interference pulses, a pulse opening an electronic switch (S) inserted between the clamping circuit and one RC section thereof is generated by means of a coincidence stage (KO), a gate circuit (TS), an inverter (I), and an AND gate (U). The clamping circuit is thus unblocked only during the horizontal synchronizing pulses, so that no shift of the separation level can occur during the vertical synchronizing pulses or during any interference pulses in the composite color signal (F).

REFERENCES:
patent: 3237110 (1966-02-01), Kaye
patent: 4081833 (1978-03-01), Akiyama
patent: 4385319 (1983-05-01), Hasegawa

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