Video signal synthesizer for producing a picture in-picture effe

Details Video signal synthesizer for producing a picture in-picture effe Video signal synthesizer for producing a picture in-picture effe

1987-05-13

1989-03-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358315, H04N 976, H04N 974, H04N 9475

Patent

active

048110850

ABSTRACT:
A video signal synthesizer for producing a picture-in-picture effect on a display device utilizes a phase locked loop circuit to generate a carrier wave synchronized with a color burst signal of a composite video signal representing a main picture to be reproduced, which carrier wave is used to modulate a time compressed second composite signal which represents a sub-picture to be superimposed on the main picture. A time division multiplexer is used to multiplex the first and time compressed second video signals to produce a picture-within-a-picture video signal for application to the receiver of a display device. By using a carrier wave generated from a phase locked loop circuit, the color subcarrier signals of both the main and sub-picture signals have the identical frequency.

REFERENCES:
patent: 3909839 (1975-09-01), Inaba et al.
patent: 4249198 (1981-02-01), Ito et al.
patent: 4712130 (1987-12-01), Casey

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