Renesas Technology Corp.

Hitachi Ulsi Systems Co., Ltd.

Hitachi Tohbu Semiconductor, Ltd.

Other

Yasutoshi Aibara

Tatsuji Matsuura

Eiki Imaizumi

Hiroki Nakajima

An AD-converted digital video data is encoded by a difference encoding method before it is outputted and such encoded digital video data is then outputted, after it is converted to gray code or to a predetermined code in which a fixed value is added. Problems solved include noise that is generated when the AD conversion circuit outputs video data and that migrates into a CCD side via a power supply line on a printed circuit board, and noise that appears on a display image by migration into an input terminal side from an output circuit side via the power supply line and a semiconductor substrate within an AD conversion LSI.

Semiconductor integrated circuit device and imaging system

In an imaging system having a semiconductor integrated circuit device, noise problems due to a large through-current in an output circuit resulting from the change-over of digital video data outputted from an AD conversion LSI are reduced by a technique involving encoding and code conversion. After AD conversion of an analog color video signal from an imaging element, a difference between codes of adjacent pixels is obtained in regard to the same color, and an output code of this difference is converted into a code with less change-over bits between the adjacent codes.

Growing community of inventors

Takasaki, Japan

Yasutoshi Aibara