Blanking circuit for television receiver

Details Blanking circuit for television receiver Blanking circuit for television receiver

1989-07-27

1990-07-17

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358180, 315384, H04N 324

Patent

active

049424718

ABSTRACT:
A blanking circuit for use in a television receiver designed for video signals of both the HDTV and double-speed scanning NTSC systems comprises a sawtooth generator, a reference voltage generator, a comparator for comparing the sawtooth signal with the reference voltage, a switch for selectively changing the relative level of the reference voltage and the sawtooth signal in conformity with the input broadcasting system, and with the output of the comparator supplied as a blanking pulse to a video signal processor. Due to selective change of the time constant of the sawtooth generator or the change of the threshold level of the reference voltage, a proper blanking pulse can be produced with high precision to prevent losing the image on the monitor CRT screen, and an adequate blanking interval is exactly obtained.

REFERENCES:
patent: 4547708 (1985-10-01), Haferl
patent: 4556906 (1985-12-01), Dischert et al.
patent: 4612484 (1986-09-01), Westwood et al.
patent: 4652920 (1987-03-01), Dietz

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