TDA9170

Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification FEATURES Picture content dependent non-linear Y and U, V processing by histogram analysis Adaptive and variable gamma correction controls Black and white stretch capabilities Transparent I2C-bus control On-chip window generator for valid histogram measurement and black detection. GENERAL DESCRIPTION The TDA9170 is a transparent analog video processor with a YUV interface. It offers three main luminance processing functions any combination of which can be selected. The luminance transfer is controlled in a non-linear manner by the distribution (in 5 discrete histogram sections) of the luminance values measured in a picture. As a result, the contrast ratio of the most important parts of the picture will be improved. ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TDA9170 SDIP32 DESCRIPTION plastic shrink in-line package; 32 leads (400 mil) TDA9170 Black restoration is available in the event of a set-up in the luminance signal. A variable gamma function, after the histogram conversion, offers the possibility of excellent brightness control. To maintain a proper colour reproduction, the saturation of the U and V colour difference signals are controlled as a function of the actual non-linearity in the luminance channel. The TDA9170 concept has maximum flexibility with the optional on-board I2C-bus (including hardwired address select) and window control. The ...