Video keying circuitry incorporating time division multiplexing

Details Video keying circuitry incorporating time division multiplexing Video keying circuitry incorporating time division multiplexing

1990-04-26

1992-05-19

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, 358181, H04N 5275

Patent

active

051153149

ABSTRACT:
Multi-keying circuitry for inserting a plurality of keys into a background television signal where at least the keying signal processing circuitry is time shared by control circuitry to effect the key insertions. The control circuitry includes dual port rams and RAM-DAC's to facilitate the time share operation. Circuitry for effecting transitions between the keys either individually or in groups is disclosed as is circuitry for previewing the keys or the transitions thereto either individually or in groups.

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