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SAA7128H Datasheet(PDF) 13 Page - NXP Semiconductors |
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SAA7128H Datasheet(HTML) 13 Page - NXP Semiconductors |
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13 / 56 page  2000 Mar 08 13 Philips Semiconductors Product specification Digital video encoder SAA7128H; SAA7129H 7.10 Input levels and formats The SAA7128H; SAA7129H expects digital Y, CB,CR data with levels (digital codes) in accordance with “ITU-R BT.601”. For C and CVBS outputs, deviating amplitudes of the colour difference signals can be compensated by independent gain control setting, while gain for luminance is set to predefined values, distinguishable for 7.5 IRE set-up or without set-up. The RGB, respectively CR-Y-CB path features a gain setting individually for luminance (GY) and colour difference signals (GCD). Reference levels are measured with a colour bar, 100% white, 100% amplitude and 100% saturation. Table 1 “ITU-R BT.601” signal component levels Notes 1. Transformation: a) R = Y + 1.3707 × (CR − 128) b) G = Y − 0.3365 × (CB − 128) − 0.6982 × (CR − 128) c) B = Y + 1.7324 × (CB − 128). 2. Representation of R, G and B (or CR, Y and CB) at the output is 9 bits at 27 MHz. Table 2 8-bit multiplexed format (similar to “ITU-R BT.601”) COLOUR SIGNALS(1) YCB CR R(2) G(2) B(2) White 235 128 128 235 235 235 Yellow 210 16 146 235 235 16 Cyan 170 166 16 16 235 235 Green 145 54 34 16 235 16 Magenta 106 202 222 235 16 235 Red 81 90 240 235 16 16 Blue 41 240 110 16 16 235 Black 16 128 128 16 16 16 TIME BITS 01234567 Sample CB0Y0 CR0Y1 CB2Y2 CR2Y3 Luminance pixel number 0123 Colour pixel number 0 2 |
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