Television keying circuit

Details Television keying circuit Television keying circuit

H - Electricity

04

N

350/53

H04N 5/275 (2006.01) H04N 5/38 (2006.01) H04N 7/08 (2006.01) H04N 9/75 (2006.01) H04N 5/00 (2006.01)

Patent

CA 1157936

12.12.1979 PHN 9433 ABSTRACT: Television keying circuit. 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 device 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 and 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.

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