SAA7128A データシートの表示（PDF） - Philips Electronics
部品番号
コンポーネント説明
メーカー
SAA7128A Datasheet PDF : 55 Pages
| |||
Philips Semiconductors
Digital video encoder
Product specification
SAA7128AH; SAA7129AH
7.10 Input levels and formats
The SAA7128AH; SAA7129AH expects digital Y, CB
and CR 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 CR-Y-CB 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
COLOUR
White
Yellow
Cyan
Green
Magenta
Red
Blue
Black
SIGNALS(1)
Y
CB
CR
R(2)
G(2)
B(2)
235
128
128
235
235
235
210
16
146
235
235
16
170
166
16
145
54
34
16
235
235
16
235
16
106
202
222
235
16
235
81
90
240
235
16
16
41
240
110
16
16
235
16
128
128
16
16
16
Notes
1. Transformation:
a) R = Y + 1.3707 × (CR − 128)
b) G = Y − 0.3365 × (CB − 128) − 0.6982 × (CR − 128)
c) B = Y + 1.7324 × (CB − 128).
2. Representation of R, G and B (or CR, Y and CB) at the output is 9 bits at 27 MHz.
Table 2 8-bit multiplexed format (similar to “ITU-R BT.601”)
TIME
Sample
Luminance pixel number
Colour pixel number
BITS
0
1
2
3
4
5
6
7
CB0
Y0
0
CR0
Y1
1
0
CB2
Y2
2
CR2
Y3
3
2
2003 Dec 09
13
Share Link: 