Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1993-12-15
1995-04-18
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358446, 348241, 348677, H04N 141
Patent
active
054083354
ABSTRACT:
An image signal sent from an image sensor is input to the inverting terminal of a differential amplifier. An A/D converter converts an output of the differential amplifier to digital output data. A comparison circuit compares the digital output data with a reference value in a dummy bit period to produce a comparison result, for instance, a difference between the digital output data and the reference value. Based on the comparison result, a correction value setting circuit modifies a correction value so that a DC offset becomes closer to the reference value. For example, the correction value setting circuit adds the difference obtained by the comparison circuit to the correction value. A D/A converter converts the modified correction data to an analog voltage, which is input to the noninverting terminal of the differential amplifier.
REFERENCES:
patent: 4660082 (1987-04-01), Tomohisa et al.
patent: 5111311 (1992-05-01), Yamamoto
patent: 5267053 (1993-11-01), Potucek et al.
patent: 5296944 (1994-03-01), Suzuki et al.
Hasegawa Kunimi
Hayashi Hiroshi
Komatsu Yasuo
Nakajima Takashi
Takahashi Atsushi
Coles Sr. Edward L.
Fuji 'Xerox Co., Ltd.
Lee Fan
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