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| 型號(hào)： | VPX3214C |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁(yè)數(shù)： | 11/80頁(yè) |
| 文件大?。?/td> | 752K |
| 代理商： | VPX3214C |
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VPX 3220 A, VPX 3216 B, VPX 3214 C
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
11
2.2.9. YCbCr Color Space
The color decoder outputs luminance and two chromi-
nance signals at a sample clock of 20.25 MHz. Active
video samples are flagged by a separate reference sig-
nal. The number of active samples is 1056 for all stan-
dards (525 lines and 625 lines). The representation of
the chroma signals is the ITUR-601 digital studio stan-
dard.
In the following equations, the RGB signals are already
gamma-weighted.
– Y
=
0.299*R + 0.587*G + 0.114*B
– (R–Y) =
0.701*R – 0.587*G – 0.114*B
– (B–Y) = –0.299*R – 0.587*G + 0.886*B
In the color decoder, the weighting for both color differ-
ence signals is adjusted individually. The default format
will have the following specification:
– Y = 224*Y + 16 (pure binary),
– C
r
= 224*(0.713*(R–Y)) + 128 (offset binary),
– C
b
= 224*(0.564*(B–Y)) + 128 (offset binary).
2.3. Component Processing
Recovery of the YCbCr components by the decoder is
followed by horizontal resizing and skew compensation.
Contrast enhancement with noise shaping can also be
applied to the luminance signal. The CbCr samples are
interpolated to create a 4:4:4 format.
Fig. 2–10 illustrates the signal flow through the compo-
nent processing stage. The YCbCr 4:2:2 samples are
separated into a luminance path and a chrominance
path. The
Luma Filtering
and
Chroma Filtering
blocks
apply FIR lowpass filters with selectable cutoff frequen-
cies. These filters are available only in VPX 3220 A. The
Resize
and
Skew
blocks alter the effective sampling
rate and compensate for horizontal line skew. The
YCbCr samples are buffered in a FIFO for continuous
read out at a fixed clock rate. In the luminance path, the
contrast and brightness can be varied and noise shaping
applied. In the chrominance path, interpolation is used
to generate a 24-bit/pixel output stream (4:4:4 format).
Resize
Skew
Resize
Skew
Sequence
Control
F
I
F
O
16 bit
Contrast &
Brightness
C
b
C
r
Upsampler
Active Video
Reference
Latch
Luma Filter
Chroma Filter
Y
out
Cb
out
Cr
out
Y
in
CbCr
in
Luma
Phase Shift
Chroma
Phase Shift
Fig. 2–10:
Component processing stage
VPX 3220 A only
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VPX3224D | Video Pixel Decoders |
| VPX3224E | Video Pixel Decoders |
| VPX322XE | Video Pixel Decoders |
| VQ1000J | N-Channel Enhancement-Mode MOSFET Transistor(最小漏源擊穿電壓60V,夾斷電流0.225A的N溝道增強(qiáng)型MOSFET晶體管) |
| VQ1000J | N-Channel 60-V (D-S) MOSFET |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPX3214C(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3214C(QFP44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Pixel Decoders |
| VPX3216B(PLCC44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
| VPX3216B(QFP44) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Decoder Circuit |
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