Image signal processor

Details Image signal processor Image signal processor

1990-01-22

1991-06-04

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358160, 358903, H04N 964, H04N 514

Patent

active

050218735

ABSTRACT:
An image signal processor includes a memory device for storing an image signal representative of a picture during one field period, an operating unit for generating a READ-OUT command necessary to read out contents stored in the memory device, a selector for selectively switching the memory device between a WRITE-IN READY condition and a READ-OUT READY condition, and a switching control unit for generating a control signal necessary to control the switching operation of the selector. The switching control unit is adapted to receive the READ-OUT command and a vertical synchronizing signal included in a composite video signal. The selector performs the switching operation in synchronism with the initial vertical synchronizing signal applied immediately after the READ-OUT command has been inputted.

REFERENCES:
patent: 4148070 (1979-04-01), Taylor
patent: 4258385 (1981-03-01), Greenberg et al.
patent: 4286291 (1981-08-01), Taylor et al.
patent: 4400717 (1983-08-01), Southworth et al.
patent: 4589020 (1986-05-01), Akatsuka
patent: 4625233 (1986-11-01), Harwood
patent: 4644398 (1987-02-01), Shimoni
patent: 4689823 (1987-08-01), Wojcik et al.

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