Signal processing unit for original reading device

Details Signal processing unit for original reading device Signal processing unit for original reading device

1983-01-20

1985-01-22

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, 358167, 357 24, H04N 110, H04N 314, H04N 521

Patent

active

044955235

ABSTRACT:
A signal processing circuit for an original reading device substantially eliminates noise from a photosignal output. Light sensing elements are connected to one of two signal lines on an alternating group basis, two or more elements per group, via MOS switching transistors. Each element is accessed twice during each cycle by switching its associated MOS twice. The noise-only signal resulting from the second switching is subtracted from the photosignal plus noise resulting from the first switching by applying the signal lines to a differential amplifier. The output signal containing reduced nose is periodically inverted to compensate for inversion of one signal line in the differential amplifier and is then subjected to integration to remove the remaining noise.

REFERENCES:
patent: 4045817 (1977-08-01), Dakatami et al.
patent: 4109284 (1978-08-01), Tompkins
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4335405 (1982-06-01), Sakame et al.
patent: 4419696 (1983-12-01), Hamano et al.
patent: 4424590 (1984-01-01), Ozawa
patent: 4449147 (1984-05-01), Ogasawara

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