Video memory control device

Details Video memory control device Video memory control device

1987-03-06

1989-01-10

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358160, H04N 504

Patent

active

047977434

ABSTRACT:
A video memory control device for a two-field video signal that is buffered in a memory having capacity for one field. The phase of the writing to and reading from the memory may be such that the fields are being swapped on output. To display the correct sequence without losing any fields, the reading address for one field is delayed by 1H or the reading address for the other field is advanced by 1H dependent on the detected phase. A similar technique may alternatively be applied to the writing side.

REFERENCES:
patent: 4249198 (1981-02-01), Ito et al.
patent: 4689676 (1987-08-01), Nakajima et al.

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