AK8850 Datasheet, PDF (51/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
( 4 ) COLOR SATURATION
Color Saturation adjustment is made by multiplying the Chroma signal with a gain factor which is set by the
[ SATURATION CONTROL REGISTER ]. The Color Saturation is adjustable range is from – ( infinite ) to + 6 dB ( 1/
255 step ). Arithmetic operations are performed on the 10-bit data. When the result exceeds the specified range, it is
clipped to 1023 ( upper limit ) or to 0 ( lower limit ).
CR
CR
Chrominace Signal
Scaling
Chrominace Signal
CB
CB
Saturation
Saturation Control Register :
* [ SATURATION CONTROL REGISTER ]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
SAT7
SAT6
SAT5
SAT4
SAT3
SAT2
SAT1
SAT0
Default Value
1
0
0
0
0
0
0
0
Sets the Chroma signal multiplying factor. The adjustable range is from – ( infinite ) to + 6 dB ( 0 ~ 2 ) with 0.008 fraction
per step. Default value is 0x80.
Rev.0
51
2003/01