SAF7118H datasheet(41/173 Pages) PHILIPS

41 / 173 page

2004 Jul 22

Philips Semiconductors

Product speciﬁcation

Multistandard video decoder with adaptive

comb ﬁlter and component video input

SAF7118

8.2.3

COMPONENT VIDEO BCS CONTROL

The resulting Y and CB-CR signals are fed to the Component BCS (CBCS) block, which contains the following functions:

• Chrominance saturation control by CSAT7 to CSAT0

• Luminance contrast and brightness control by CCON7 to CCON0 and CBRI7 to CBRI0

• Limiting Y-C

B-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.27 Components Y-CB-CR range.

“ITU Recommendation 601/656” digital levels with default CBCS (decoder) settings CCON[7:0] = 44H, CBRI[7:0] = 80H and CSAT[7:0] = 40H.

Equations for modification to the Y-CB-CR levels via CBCS control I2C-bus bytes CBRI, CCON and CSAT.

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

CCON

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

128

–

()

CBRI

B CR

()

OUT

Int

CSAT

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

B CR

128

–

()

128

a. Y output range.

b. CB output range.

c. CR output range.

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