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參數(shù)資料
| 型號： | VPC3200A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Comb Filter Video Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 14/78頁 |
| 文件大?。?/td> | 1245K |
| 代理商： | VPC3200A |
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VPC 323xD, VPC 324xD
ADVANCE INFORMATION
14
Micronas
Table 2–1 gives the picture settings achieving exact
level
matching
between
YC
r
C
b
_main channel.
the
YC
r
C
b
_cip
and
Note: R, G, B, C
r
, C
b
, = 0.7 V
pp
, Y(+ sync) 1 V
pp
2.4.4. Softmixer
After an automatic delay matching, the component sig-
nals and the upsampled main video signal are gath-
ered onto a unique YC
r
C
b
channel by means of a ver-
satile 4:4:4 softmixer (see also Fig. 2–10).
The softmixer circuit consists of a Fast Blank (FB) pro-
cessing block supplying a mixing factor k (0...64) to a
high quality signal mixer achieving the output function:
YC
r
C
b
_mix=( k*YC
r
C
b
_main+ (64-k)*YC
r
C
b
_cip )/64
The softmixer supports several basic modes that are
selected via I
2
C bus (see Table 2–2).
2.4.4.1. Static Switch Mode
In its simplest and most common application the soft-
mixer is used as a static switch between YC
r
C
b
_main
and YC
r
C
b
_cip. This is for instance the adequate way
to handle a DVD component signal.
The factor k is clamped to 0 or 64, hence selecting
YC
r
C
b
_main or the component input YC
r
C
b
_cip. (see
Table 2–2)
2.4.4.2. Static Mixer Mode
The signal YC
r
C
b
_main and the component signal
YC
r
C
b
_cip may also be statically mixed. In this envi-
ronment, k is manually controlled via I
2
C registers
FBGAIN and FBOFFS according to the following
expression:
k = FBGAIN*(31
FBOFFS) + 32
All the necessary limitation and rounding operation are
built-in to fit the range: 0
≤
k
≤
64.
In the static mixer mode as well as in the previously
mentioned static switch mode (see Table 2–2), the
softmixer operates independently of the analogue Fast
Blank input.
2.4.4.3. Dynamic Mixer Mode
In the dynamic mixer mode, the mixer is controlled by
the Fast Blank signal. The VPC32xxD provides a linear
mixing coefficient
k=kl = FBGAIN*(FB
FBOFFS) + 32
(FB is the digitized Fast Blank), and a non-linear mix-
ing coefficient knl=F(kl), which results from a further
non-linear processing of kl.
While the linear mixing coefficient is used to insert a
fullscreen video signal, the non-linear coefficient is
well-suited to insert Fast Blank related signals like text.
The non-linear mixing reduces disturbing effects like
over/undershoots at critical Fast Blank edges.
Fig. 2–10:
Block diagram of the component mixer
Table 2–1:
Standard picture settings
input
format
contrast
brightness
satCr
satCb
RGB
27
68
29
23
YC
r
C
b
27
68
40
40
Y/C processing
mixer
Component
Processing
VIDEO
RGB/YCrCb
YCrCb_main
YCrCb_cip
YCrCb_mix
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相關(guān)代理商/技術(shù)參數(shù) |
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| VPC3200APSGP | 制造商:MICRONAS 功能描述:New |
| VPC3201A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
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| VPC3210A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3210B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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