Multi-keying circuitry

Details Multi-keying circuitry Multi-keying circuitry

H - Electricity

04

N

350/53

H04N 5/262 (2006.01) H04N 5/272 (2006.01) H04N 5/275 (2006.01)

Patent

CA 2039277

ABSTRACT OF THE DISCLOSURE 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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