Television keying circuit

Details Television keying circuit Television keying circuit

1980-04-07

1982-10-26

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 522

Patent

active

043565123

ABSTRACT:
A keying circuit for television, in the form of a special effect generator or a chroma-keying circuit. In order to generate a keying signal which does not cause flicker phenomena in an interlaced television picture when there is a great contrast in the region of a signal switch-over between two video signals in response to the keying signal, the circuit comprises a signal delay circuit and a signal combining circuit for the binary keying signal which occurs undelayed and delayed. The signal delay device has delay times of a field period minus and plus one line period or of one and two line periods, respectively. This results in a gradually changing keying signal there, where the flicker phenomenon in the interlaced television picture might occur.

REFERENCES:
patent: 3986204 (1976-10-01), Smith
patent: 4122490 (1978-10-01), Lish

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