Digital modulation technique

Details Digital modulation technique Digital modulation technique

1989-10-10

1990-08-21

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, H04N 140

Patent

active

049511599

ABSTRACT:
A digital pulse with modulator is described for use with a Raster-scanning print engine in which a grey scale having a high number of levels, typically at least 63, is described. This modulator reduces the amount of information requiring processing in the input multiple bit image signal by simulating one of the least significant bits as a delay applied to modulate the output print engine signal pulse width. With suitable speed components, a grey scale of at least about 255 levels can be provided.

REFERENCES:
patent: 4533958 (1985-08-01), Herget
patent: 4661859 (1987-04-01), Mailloux et al.
patent: 4698688 (1987-10-01), Ochi et al.
patent: 4802105 (1989-01-01), Suzuki
patent: 4809082 (1989-02-01), Yamaguchi et al.
patent: 4814877 (1989-03-01), Nagashima

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