SAF7118H datasheet(34/173 Pages) PHILIPS

34 / 173 page

2004 Jul 22

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

white

black

CB-COMPONENT

+255

+240

+212

+128

+16

+44

blue 100%

blue 75%

yellow 75%

yellow 100%

colourless

CR-COMPONENT

+255

+240

+128

+16

+44

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”.

OUT

Int

DCON

-----------------

128

–

()

DBRI

R CB

()

OUT

Int

DSAT

----------------

R CB

128

–

()

128

a. Y output range.

b. CB output range.

c. CR output range.

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