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参数资料
| 型号： | HMP8112EVAL2 |
| 厂商： | Harris Corporation |
| 英文描述： | NTSC/PAL Video Decoder |
| 中文描述： | NTSC / PAL视频解码器 |
| 文件页数： | 7/40页 |
| 文件大小： | 563K |
| 代理商： | HMP8112EVAL2 |
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7
internal decoding frequency of 4xf
SC
.
The input sample rate converter will interpolate between
existing CLK samples to create the chroma locked (4xf
SC
)
samples needed for the color decoder. An interpolation is
done to create the 4xf
SC
pixel and a correction factor is then
applied..
INCOMING VIDEO SAMPLES
The decoder can be used with the following video sources:
Analog Composite - NTSC M, - PAL B, D, G, H, I, N
And Special Combination PAL N
Analog S - VHS (Y/C) - NTSC M, PAL B, D, G, H, I, N
And Special Combination PAL N
Color Separation, And Demodulation
To separate the chrominance modulated color information
from the baseband luminance signal, a 2 line comb filter is
employed. In NTSC signals the color information changes
phase 180
o
from one line to the next. This interleaves the
chrominance information at half line intervals throughout the
NTSC video spectrum. Therefore, NTSC has 227.5 cycles of
chrominance per NTSC line. The half of a cycle causes the
next reference burst to be 180
o
out of phase with the previ-
ous line’s burst. The two line comb efficiently removes the
chrominance information from the baseband luminance sig-
nal. When decoding NTSC, the decoder maintains full lumi-
nance bandwidth horizontally throughout the chrominance
carrier frequency range. Unlike most 2 line comb filter sepa-
ration techniques, vertical bandwidth is maintained by
means of a proprietary transform technique.
For PAL systems there are 283.75 cycles of chrominance
per line. Chrominance information is spaced at quarter line
intervals with a reference phase of 135
o
. The reference
FIGURE 2A. PLL ACQUISITION MODE
FIGURE 2B. PLL LOCKED MODE
VIDEO INPUT
HAGC
DC RESTORE
OVERLAPPED CONTROL
t
PW
= 2.0
μ
s
0
HSYNC
VIDEO INPUT
HAGC
DC RESTORE
START
TIME
END
TIME
START
TIME
END
TIME
6.5
μ
s
0
HSYNC
TIME
TIME
RESAMPLED VIDEO
4xf
SC
FIGURE 3. SAMPLE RATE CONVERSION
FREQUENCY
AMPLITUDE
f
H
/2
f
H
/2
f
H
Y
I, Q
Y
FREQUENCY
AMPLITUDE
Y
Y
I, Q
FIGURE 4. COMPOSITE NTSC INTERLEAVE SCHEME
HMP8112
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|---|---|
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| HMP8156EVAL1 | NTSC/PAL Encoders |
| HMP8156EVAL2 | NTSC/PAL Encoders |
| HMP8156 | NTSC/PAL Encoder |
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相关代理商/技术参数 |
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|---|---|
| HMP8115 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
| HMP8115CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
| HMP8116 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
| HMP8116CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
| HMP8117 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
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