Picture-in-picture television receivers

Details Picture-in-picture television receivers Picture-in-picture television receivers

1986-10-06

1987-06-16

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5272, H04N 5262

Patent

active

046739831

ABSTRACT:
In a picture-in-picture television receiver, the subpicture signal is A-D converted; the converted digital subpicture signal is latched in response a subpicture clock in synchronism with a subpicture synchronizing signal; the latched signal is latched again and stored in an image memory in response to a main picture synchronizing signal; and the latched signal is read from the image memory in synchronism with the main picture synchronizing signal, in order that the subpicture can stably be inserted in a predetermined area of the main picture by eliminating the unstable data duration during which variation in the subpicture signal is different for each bit signal thereof.

REFERENCES:
patent: 3936868 (1976-02-01), Thorpe
patent: 4139860 (1979-02-01), Micic et al.
patent: 4152719 (1979-05-01), Kellar
patent: 4249213 (1981-02-01), Imaide et al.
patent: 4367484 (1983-01-01), Kuroyanagi et al.
patent: 4623915 (1986-11-01), Bolger

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