Control of visual display units

Details Control of visual display units Control of visual display units

1989-03-13

1990-05-22

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358909, H04N 514

Patent

active

049281780

ABSTRACT:
Apparatus for controlling a visual display unit from a video signal which is present for a first period of time such that an image corresponding to the signal can be displayed for one or more further such periods. The apparatus stores a digital representation of the video signal which is used to enable the required image to persist for the one or more further periods. The apparatus also generates during the first period a correction signal which is combined with the video signal and used to compensate for any imprecision in the stored signal. This arrangement permits the use of relatively small storage devices and relatively simple analogue-to-digital converters.

REFERENCES:
patent: 4792863 (1988-12-01), Urabe
"Hybrid-pulse coding: theoretical assessment of system"; BBC Research Department; No. 1969/40; Oct. 1969.
"Hybrid-pulse coding: experimental assessment of system as applied to video signals"; BBC Research Department; No. 1969/45; Nov. 1969.
"Hybrid-pulse coding; experimental equipment for tests with video signals"; BBC Research Department; No. 1969/46; Nov. 1969.

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