TV receiver having in-memory switching signal

Details TV receiver having in-memory switching signal TV receiver having in-memory switching signal

1987-10-28

1989-04-11

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358181, 358183, H04N 974, H04N 976

Patent

active

048210862

ABSTRACT:
A secondary video signal is sampled, digitized and combined with an in-memory switching signal. The combined digital signal is stored in a random access video memory. The stored signal is read out in synchronism with the synchronizing signal components of a primary video signal. The switching signal is recovered from the output of the memory, and compared with a content code signal to develop a fast switching signal. A video output switch, coupled to receive the primary video signal and the stored secondary video signal and responsive to the fast switching signal, applies an appropriate one of the two input signals to the kinescope to define a secondary inset picture within a large primary picture.

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patent: 4490797 (1987-12-01), Staggs et al.
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patent: 4724487 (1988-02-01), Casey
patent: 4782391 (1988-11-01), McNeely et al.
patent: 4789960 (1988-12-01), Willis

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