Integrated circuit with exterior gain control adjustment

Details Integrated circuit with exterior gain control adjustment Integrated circuit with exterior gain control adjustment

1993-09-21

1995-03-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358445, 348255, 348678, H04N 140

Patent

active

054022495

ABSTRACT:
An integrated circuit for processing an analog image signal obtained from a CCD, etc. and converting the processed image signal to a digital image signal. The integrated circuit includes a circuit for adjusting an offset voltage included in the analog image signal, a circuit for sampling/holding the image signal from the adjusting circuit, a variable amplifier for varying an amplitude of the image signal output from the sampling/holding circuit, an analog/digital converter for converting the image signal from the variable amplifier to a digital signal, and a circuit for detecting a DC component included in the digital image signal and providing the detection result to the adjusting circuit. Correction of a DC voltage component of the analog image signal and amplitude adjustment of the analog image signal can be performed by using a single LSI, and the LSI can be connected to various types of CCDs without using an additional circuit.

REFERENCES:
patent: 4525741 (1985-06-01), Chahal et al.
patent: 4748677 (1988-05-01), Yokomizo
patent: 4884129 (1989-11-01), Ozawa et al.
patent: 5079623 (1992-01-01), Sendelweck et al.
patent: 5206501 (1993-04-01), Sakakibara et al.

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