Video bit transition advancement circuit

Details Video bit transition advancement circuit Video bit transition advancement circuit

1986-02-06

1988-03-29

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 340812, G09G 116

Patent

active

047346914

ABSTRACT:
In order to compensate for image distortion introduced into a digitally controlled raster-scan CRT by the finite video amplifier rise and fall times, the digital video drive waveform is subjected to selective pulse stretching to extend the duration of each pel which is immediately preceded by a pel of lower light intensity value (brightness). This is achieved by means of a comparator (14) which examines each current pel PEL(N) in the video data stream in relation to its immediately preceding neighbor PEL(N-1) in order to detect pel boundary transition therebetween representing an increase in brightness from the preceding pel to the current pel. Re-timing means (17, 19, 21, 22) is operably under control of the comparator output to cause advancement in time by a predetermined amount (dt) of any such pel boundary transition relative to remaining pel boundary transitions.

REFERENCES:
patent: 4604614 (1986-08-01), Farr et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, pp. 3325-3327, M. H. Nasser et al.; "Correction of Phase Distortion in a Television Receiver when used for Character Display Purposes".

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