Video blanking circuit with controlled rate of unblanking

Details Video blanking circuit with controlled rate of unblanking Video blanking circuit with controlled rate of unblanking

1980-11-26

1982-05-18

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358165, 3581911, 3581931, H04N 9535

Patent

active

043307922

ABSTRACT:
A circuit is disclosed for automatically blanking the kinescope of a color television receiver during channel changing intervals. The receiver also includes an automatic kinescope beam current limiter, plural kinescope driver stages, and a source of reference bias voltage to which video signals amplified by the kinescope driver stages are normally referenced, coupled in common to the plural kinescope driver stages. During channel changing intervals, the blanking circuit modifies the reference voltage with a given blanking response time so that the driver stages and kinescope are blanked. The blanking circuit exhibits an unblanking response time, slower than the blanking response time, for permitting the reference bias voltage to gradually return to a normal level after the channel change interval ends, at which time the driver stages and kinescope are unblanked and operate normally.

REFERENCES:
patent: 3131255 (1964-04-01), Di Nardo
patent: 3573365 (1971-04-01), Anderson
patent: 3673318 (1972-06-01), Olsen et al.
patent: 3707597 (1972-12-01), Lunn
patent: 4047226 (1977-09-01), Hedges
RCA TV Service Data Chassis CTC 101, RCA Consumer Electronics, File 1979 C-7, 1979.

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