參數(shù)資料
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)： 13/80頁(yè)
文件大?。?/td> 752K
代理商： VPX3214C
VPX 3220 A, VPX 3216 B, VPX 3214 C
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
13
dB
MHz
0
0
2
4
6
8
10
–1
–2
–3
–4
–5
–6
–7
–8
2
1
clocks
MHz
2.5
2.3
0
2
4
6
8
10
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0.6
0.7
0.8
0.9
1.0
0.1, 0.9
0.2, 0.8
0.3, 0.7
0.4, 0.6
0.5
parameter:
α,
32 steps
0.4
0.3
0.2
0.1
0
0.5
0, 1.0
parameter:
α,
32 steps
Fig. 2–14:
Luminance skew filter magnitude
frequency response
Fig. 2–15:
Luminance skew filter group delay
characteristics
dB
0
–1
–2
–3
–4
–5
–6
–7
–8
2
1
MHz
0
1
2
3
4
5
MHz
0
1
2
3
4
5
clocks
5.0
4.6
4.2
3.8
3.4
3.0
2.6
2.2
1.4
1
0.5
0.8
1.0
0.2
0
0.5
0.25
0, 1.0
parameter:
α,
4 steps
parameter:
α,
4 steps
Fig. 2–16:
Chrominance skew filter magnitude
frequency response
Fig. 2–17:
Chrominance skew filter group delay
characteristics
2.3.2. Skew Correction
The VPX delivers orthogonal pixels with a fixed clock
even in the case of non-broadcast signals with substan-
tial horizontal jitter (VCRs, laser disks, certain portions
of the 6 o’clock news...).
This is achieved by highly accurate sync slicing com-
bined with post correction. Immediately after the analog
input is sampled, a horizontal sync slicer tracks the posi-
tion of sync. This slicer evaluates, to within 1.6 ns., the
skew between the sync edge and the edge of the pixel-
clock. This value is passed as a skew on to the phase
shift filter in the resizer. The skew is then treated as a
fixed initial offset during the resizing operation.
2.3.3. Contrast, Brightness, and Noise Shaping
I
out
= c * I
in
+ b
c = 0...63/32 in 64 steps
b = –127...128 in 256 steps
A selectable gain and offset can be applied to the lumi-
nance samples. Both the gain and offset factors can be
set externally via I
2
C serial control. Fig. 2–18 gives a
functional description of this circuit. First, a gain is ap-
plied, yielding a 10-bit luminance value. The conversion
back to 8-bit is done using one of three selectable tech-
niques: simple rounding, 1-bit error diffusion, or 2-bit er-
ror diffusion.
Contrast
Select
Rounding
1 bit
Err. Diff.
2 bit
Err. Diff.
Brightness
I
2
C Registers
Fig. 2–18:
Contrast and brightness adjustment
2.3.4. C
b
C
r
Upsampler
Simple interpolation is used to convert the 4:2:2 video
samples up to the 4:4:4 format. The CbCr samples are
upsampled and then band limited with the linear phase
FIR kernel. The passband of this filter covers the entire
chroma spectrum present in analog composite and
S-VHS signals.
相關(guān)PDF資料
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