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SAF7118H 数据表(PDF) 34 Page - NXP Semiconductors |
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SAF7118H 数据表(HTML) 34 Page - NXP Semiconductors |
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34 / 173 page  2004 Jul 22 34 Philips Semiconductors Product specification Multistandard video decoder with adaptive comb filter and component video input SAF7118 8.1.2.3 Brightness Contrast Saturation (BCS) control and decoder output levels The resulting Y (CVBS) and CB-CR signals are fed to the BCS block, which contains the following functions: • Chrominance saturation control by DSAT7 to DSAT0 • Luminance contrast and brightness control by DCON7 to DCON0 and DBRI7 to DBRI0 • Raw data (CVBS) gain and offset adjustment by RAWG7 to RAWG0 and RAWO7 to RAWO0 • Limiting Y-CB-CR or CVBS to the values 1 (minimum) and 254 (maximum) to fulfil “ITU Recommendation 601/656”. handbook, full pagewidth LUMINANCE 100% +255 +235 +128 +16 0 white black CB-COMPONENT +255 +240 +212 +212 +128 +16 +44 0 blue 100% blue 75% yellow 75% yellow 100% colourless CR-COMPONENT +255 +240 +128 +16 +44 0 red 100% red 75% cyan 75% cyan 100% colourless MHB730 Fig.19 Y-CB-CR range for scaler input and X port output. “ITU Recommendation 601/656” digital levels with default BCS (decoder) settings DCON[7:0] = 44H, DBRI[7:0] = 80H and DSAT[7:0] = 40H. Equations for modification to the Y-CB-CR levels via BCS control I2C-bus bytes DBRI, DCON and DSAT. Luminance: Chrominance: It should be noted that the resulting levels are limited to 1 to 254 in accordance with “ITU Recommendation 601/656”. Y OUT Int DCON 68 ----------------- Y 128 – () × DBRI + = C R CB () OUT Int DSAT 64 ---------------- C R CB , 128 – () × 128 + = a. Y output range. b. CB output range. c. CR output range. |
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