Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1978-12-14
1980-10-07
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358280, H04N 140
Patent
active
042272181
ABSTRACT:
A facsimile transmitter detects dark-light variations in an illuminated document by means of a photodetector. After amplification, the output from the photodetector is applied to a threshold detector generating a multilevel digital signal. When the magnitude of the amplified photodetector signal is greater than one fixed threshold level, one level of the digital signal is generated. When the magnitude of the amplified photodetector signal is less than another fixed threshold level, another level of the digital signal is generated. When the magnitude of the amplified photodetector output lies between the two threshold levels, one level of the digital signal is generated when the peaked, amplified photodetector signal is greater than the unpeaked amplified photodetector signal and the other level of the digital signal is generated when the peaked amplified photodetector signal is less than the unpeaked, amplified photodetector signal. The threshold detector output is utilized to control a carrier modulator which generates signals for transmission to a remotely located receiver through a communications link.
REFERENCES:
patent: 3223778 (1965-12-01), Stone
patent: 3294896 (1966-12-01), Young
patent: 3566281 (1971-02-01), Baumann
patent: 3675201 (1972-07-01), McKissick
patent: 3723649 (1973-03-01), Pitegoff
patent: 3868477 (1975-02-01), Katzman
Britton Howard W.
Exxon Research & Engineering Co.
Norris N. L.
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