參數(shù)資料
型號: SAA7128
廠商: NXP Semiconductors N.V.
英文描述: Digital video encoder
中文描述: 數(shù)字視頻編碼器
文件頁數(shù): 13/56頁
文件大小: 192K
代理商: SAA7128
2000 Mar 08
13
Philips Semiconductors
Product specification
Digital video encoder
SAA7128H; SAA7129H
7.10
Input levels and formats
TheSAA7128H;SAA7129HexpectsdigitalY, C
B
, C
R
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 C
R
-Y-C
B
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
×
(C
R
128)
b) G = Y
0.3365
×
(C
B
128)
0.6982
×
(C
R
128)
c) B = Y + 1.7324
×
(C
B
128).
Representation of R, G and B (or C
R
, Y and C
B
) at the output is 9 bits at 27 MHz.
2.
Table 2
8-bit multiplexed format (similar to “ITU-R BT601”)
COLOUR
SIGNALS
(1)
Y
C
B
128
16
166
54
202
90
240
128
C
R
128
146
16
34
222
240
110
128
R
(2)
G
(2)
B
(2)
White
Yellow
Cyan
Green
Magenta
Red
Blue
Black
235
210
170
145
106
81
41
16
235
235
16
16
235
235
16
16
235
235
235
235
16
16
16
16
235
16
235
16
235
16
235
16
TIME
BITS
0
1
2
3
4
5
6
7
Sample
Luminance pixel number
Colour pixel number
C
B
0
Y0
C
R
0
Y1
C
B
2
Y2
C
R
2
Y3
0
1
2
3
0
2
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