Video memory control apparatus

Details Video memory control apparatus Video memory control apparatus

1989-10-11

1991-10-08

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, H04N 140

Patent

active

050559400

ABSTRACT:
A video memory control apparatus has a frame memory in a video printer or the like constituted by two field memories. The two field memories are arranged so as to be switched in response to a signal obtained by frequency-dividing a vertical synchronizing signal into halves. At this time, not only the respective outputs of the two field memories are switched but also the supply of clock pulses for writing/reading is switched in response to the frequency-divided signal.

REFERENCES:
patent: 4563706 (1986-01-01), Nagashima
patent: 4570187 (1986-02-01), Ono et al.
patent: 4717963 (1988-01-01), Koizumi
patent: 4864391 (1989-09-01), Taguchi
patent: 4868643 (1989-09-01), Taguchi
patent: 4908719 (1990-03-01), Nonoyama

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