Analog front-end circuit and electronic instrument

Details Analog front-end circuit and electronic instrument Analog front-end circuit and electronic instrument

2011-08-16

2011-08-16

Thompson, James A (Department: 2625)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S003240, C358S465000, C358S519000, C358S530000

Reexamination Certificate

active

07999975

ABSTRACT:
An analog front-end circuit includes an analog processing circuit, an A/D converter, a calculation circuit, and a target register in which a black level target value is set. The analog processing circuit includes a clamp circuit that performs a line clamp operation, and an offset adjustment circuit. The calculation circuit monitors an A/D-converted value of a black reference pixel after the line clamp operation in a black level monitor period after a line clamp period but before an effective pixel output period, and performs a black level error correction process by writing an offset adjustment value that causes the A/D-converted value to be set at the black level target value into the offset adjustment register.

REFERENCES:
patent: 5038225 (1991-08-01), Maeshima
patent: 6249615 (2001-06-01), Kunishige
patent: 7006065 (2006-02-01), Sugawara et al.
patent: 2003/0072497 (2003-04-01), Hiromatsu
patent: 2007/0127046 (2007-06-01), Soeda
patent: 2008/0204297 (2008-08-01), Mizuta
patent: A-2000-278495 (2000-10-01), None
patent: A-2001-203891 (2001-07-01), None
patent: A-2001-268364 (2001-09-01), None
patent: A-2004-297146 (2004-10-01), None
patent: A-2006-186606 (2006-07-01), None
patent: A-2006-217205 (2006-08-01), None
New U.S. Patent Application filed May 8, 2008. In the name of Masahiko Mizuta.

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