Video keying circuitry incorporating time division multiplexing
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Apr 26, 1990
filing date -
Apr 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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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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