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参数资料
| 型号： | DDP3315CQA |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 3/62页 |
| 文件大小： | 1746K |
| 代理商： | DDP3315CQA |
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ADVANCE INFORMATION
Micronas
11
2.1.7. Chroma Interpolation
In case of YCrCb 4:1:1 input format, the digital input
signal is converted to 4:2:2 format by an interpolation
filter working at the input pixel clock frequency.
The signal is passed to the scaler in YCrCb 4:2:2 for-
mat, in order to convert the incoming pixel clock fre-
quency (27/32 MHz) to the internal frequency (40.5/
40 MHz).
A linear phase interpolator is used to convert the
chroma sampling rate from 4:2:2 to 4:4:4. The fre-
quency response of the interpolator is shown in
Fig. 2–6. All further processing is carried out at the full
sampling rate.
Fig. 2–6: Frequency response of the chroma 4:2:2 to
4:4:4 interpolation filter
2.1.8. Chroma Transient Improvement
The intention of this block is to enhance the chroma
resolution. A correction signal is calculated by differen-
tiation of the color difference signals. The differentia-
tion can be selected according to the signal bandwidth,
e.g. for PAL/NTSC/SECAM or digital component sig-
nals, respectively. The amplitude of the correction sig-
nal is adjustable. Small noise amplitudes in the correc-
tion signal are suppressed by an adjustable coring
circuit. To eliminate “wrong colors”, which are caused
by over and undershoots at the chroma transition, the
sharpened chroma signals are limited to a proper
value automatically (see Fig. 2–7).
Fig. 2–7: Luma/chroma transient improvement
2.1.9. Inverse Matrix and Digital RGB Processing
Six multipliers in parallel perform the matrix multiplica-
tion to transform the Cr and Cb signals to R-Y, B-Y, and
G-Y. The initialization values for the matrix are com-
puted from the standard ITU-R matrix:
The multipliers are also used to adjust color saturation
and picture contrast. The matrix computes:
dB
MHz
0
10
20
30
40
50
04
8
12
16
20
CrCb
input
a)
Ampl.
b)
Cr out
Cb out
c)
a) CrCb input of CTI
b) CrCb input + correction signal
c) sharpened and limited CrCb
t
R
G
B
1
0
1,402
1
0,345
–
0,713
–
1 1,773
0
Y
Cb
Cr
×
=
R
G
B
CTM
32
-------------
SATM
32
----------------
×
1
64
------
×
MR1MMR2M
MG1MMG2M
MB1MMB2M
×
Cb
Cr
CTM
32
-------------
Y
×
+
×
=
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