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參數資料
型號: 935262451518
廠商: NXP SEMICONDUCTORS
元件分類: 顏色信號轉換
英文描述: COLOR SIGNAL DECODER, PQFP100
封裝: 14 X 14 X 1.40 MM, PLASTIC, SOT-407, LQFP-100
文件頁數: 66/144頁
文件大小: 592K
代理商: 935262451518
2000 Mar 15
28
Philips Semiconductors
Preliminary specication
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb lter, VBI-data slicer and high performance scaler
SAA7114H
8.1.3.3
Brightness Contrast Saturation (BCS) control and decoder output levels
The resulting Y (CVBS) and UV-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 YUV or CVBS to the values 1 (minimum) and 254 (maximum) to fulfil “ITU Recommendation 601/656”.
Fig.17 YUV 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 YUV 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
+
=
UV
OUT
Int
DSAT
64
----------------
C
R CB
,
128
()
×
128
+
=
ndbook, full pagewidth
LUMINANCE 100%
+255
+235
+128
+16
0
white
black
U-COMPONENT
+255
+240
+212
+128
+16
+44
0
blue 100%
blue 75%
yellow 75%
yellow 100%
colourless
V-COMPONENT
+255
+240
+128
+16
+44
0
red 100%
red 75%
cyan 75%
cyan 100%
colourless
MGC634
a. Y output range.
b. U output range (CB).
c. V output range (CR).
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