Picture-in-picture television apparatus with sync controlled mem

Details Picture-in-picture television apparatus with sync controlled mem Picture-in-picture television apparatus with sync controlled mem

1989-04-13

1991-02-05

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 545

Patent

active

049910132

ABSTRACT:
An apparatus for processing video signals to produce a combined picture video signal from which a large picture and one or more small pictures being inset in the large picture are simultaneously reproduced on a display screen. Video signals providing image information for small pictures are stored in a memory mainly on the basis of a storage control signal produced from a result of a phase comparison between a reference signal and a vertical sync signal separated from each of the video signals providing image information for small pictures. The reference signal has pulses recurrent with a period twice the repetition period of pulses of the vertical sync signal in the video signal or identical with the repetition period of pulses of a horizontal sync signal in the video signal, and assumes a relatively high level and a relatively low level alternately with a duty factor of 50%.

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patent: 4809069 (1989-02-01), Meyer et al.
patent: 4816915 (1989-03-01), Imai et al.
patent: 4855833 (1989-08-01), Kageyama et al.

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