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參數(shù)資料
| 型號(hào)： | DDP3310B |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Display and Deflection Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 9/60頁 |
| 文件大?。?/td> | 1540K |
| 代理商： | DDP3310B |
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ADVANCE INFORMATION
DDP 3310B
Micronas
9
2.1.7. Chroma Interpolation
In case of YC
r
C
b
4:1:1 input format, an interpolation fil-
ter is used which converts the digital input signal to
4:2:2 format. This filter runs with the incoming pixel
clock frequency.
The signal is passed to the scaler in YC
r
C
b
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 frequency response of the interpolator is shown in
Fig. 2
–
4. All further processing is carried out at the full
sampling rate.
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.
2.1.9. Inverse Matrix and Digital RGB Processing
Six multipliers in parallel perform the matrix multiplica-
tion to transform the C
r
and C
b
signals to R
Y, B
Y,
and G
Y. The initialization values for the matrix are
computed from the standard ITU-R (CCIR) matrix:
The multipliers are also used to adjust color saturation
and picture contrast. Since the multiplier allows
±
4 as
the biggest coefficient, it is possible that the product of
CTM
×
SATM
×
MxxM will be clipped, which causes
wrong colors. SATLIM limits the product of contrast
times saturation to allow a maximum oversaturation.
The matrix computes:
Fig. 2
–
4:
Frequency response of the chroma 4:2:2 to
4:4:4 interpolation filter
Fig. 2
–
5:
Digital color transient improvement
After adding the post-processed luma, the digital RGB
signals are limited to 10 bits. Three multipliers are
used to digitally adjust the white-drive and to imple-
ment an average beam current limiter. See also Sec-
tion 2.2.4.
“
CRT Measurement and Control
”
.
R
G
B
1
1
1 1,773
0
1,402
0,713
–
0
0,345
–
Y
Cb
Cr
×
=
dB
MHz
0
-10
-20
-30
-40
-50
0
4
8
12
16
20
t
t
t
C
r
out
C
b
out
Ampl.
C
r
C
b
input
a)
b)
c)
a) C
r
C
b
input of DTI
b) C
r
C
b
input
+
correction signal
c) sharpened and limited C
r
C
b
R
G
B
MIN
32
------------
32
---------------
×
---------------------
,
32
64
-----
×
MR
1
M MR
2
M
MG
1
M MG
2
M
MB
1
M MB
2
M
×
Cb
Cr
32
------------
Y
×
+
×
=
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