Artificial front porch insertion circuit

Details Artificial front porch insertion circuit Artificial front porch insertion circuit

1989-08-14

1991-04-30

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358171, 358 17, H04N 516, H04N 972

Patent

active

050123300

ABSTRACT:
A circuit for ensuring that the level of the front porch of each line in a color video signal is at a predetermined proper level includes a circuit for detecting the position of the horizontal synchronization pulse in each line, a circuit for generating an artificial front porch signal, and a controllable switch connected to receive the color video signal and the artificial front porch signal. The controllable switch, under the control of the detecting circuit, provides a signal for a subsequent color decoder circuit in which the front porch in each line in the color video signal is replaced by the artificial front porch signal.

REFERENCES:
patent: 4215371 (1980-07-01), Baggett et al.
patent: 4295155 (1981-10-01), Jarger et al.
patent: 4663659 (1987-05-01), Blatter

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