Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

1989-06-07

1990-11-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358183, H04N 5272, H04N 5268

Patent

active

049714481

ABSTRACT:
In a video signal processing circuit with a field memory circuit (9) for, a field frequency doubling of a first video signal and a second video signal, in which the second video signal can be displayed in a sub-picture of the main picture determined by the first video signal, it is not necessary to use an additional field memory for obtaining the sub-picture if a line memory circuit (157) is used for temporarily storing the second video signal (65) which is not synchronized with the first video signal (1). During line retrace periods of the first video signal, the second video signal is then transferred (31, 29, 5, 7; 19, 35, 13; 105, 103, 101, 107, 99) from this line memory circuit to a section (39) of the field memory circuit (9) corresponding to the sub-picture.

REFERENCES:
patent: 4750038 (1988-06-01), Welles
patent: 4750212 (1988-06-01), Yokomizo
patent: 4768083 (1988-08-01), Romesburg
patent: 4860106 (1989-08-01), Taupin
"Picture-In-Picture Digital Color Television Receiver", by Tsuneo Miyamoto, Mitsuo Hirose and Masaur Takeshita; 298 NEC Research & Development, No. 86 (1987).

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