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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： | 9/40页 |
| 文件大小： | 563K |
| 代理商： | HMP8112EVAL2 |
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9
(4 x f
SC
)/CLK = Chroma PLL Value
(4 x 3.579545MHz) / 27MHz = 0.5302895
This value must be loaded to correctly separate and decode
the video signal. A default Chroma PLL Value is used after a
system RESET is applied. The default assumes a CLK of
27MHz and NTSC as the video standard. The default value
is 0.5302895. An ideal 4xf
SC
line should have 910 pixels for
NTSC and 1135 for PAL.
The Output Sample rate converter is locked to the horizontal
line frequency and is used to spatially align pixels in a field.
The LOCKED flag signals when the phase locked loop is
within a
±
4 pixel range of the horizontal sync edge. When
line errors exceed that range the LOCKED flag is cleared.
In cases where VCRs are used in Pause, Fast Forward or
Fast Reverse, lines are typically dropped or added by the
VCR. In a worst case scenario a VCR line tolerance will vary
by
±
8%. The standard detect logic checks the line count
against the given standard to determine an error. VCRs in
trick mode cannot cause a standard error. With an NTSC
standard VCR the number of lines in a field should not
exceed 285. Greater than 285 lines in a field is interpreted
as a PAL video source. An ideal NTSC source should have
262.5 lines per field and a PAL source should have 312.5
lines per field.
The HMP8112 can detect a STANDARD Error that signals
when the video received does not match the standard that
was programmed into the Video Input Control Register. This
TABLE 2. COMPATIBLE VIDEO INPUT STANDARDS
STANDARD
COLOR
SUBCARRIER
f
SC
3.579545MHz
NUMBER OF
FIELDS PER
SECOND
NUMBER OF
VERTICAL
LINES
LINE
FREQUENCY
NOMINAL
BANDWIDTH
BLACK
SETUP TO
BLANK
NTSC M
60Hz
525
15,734
(
±
0.0003%)
4.2MHz
7.5 IRE
PAL B, D, G, H, I
4.43361875MHz
50Hz
625
15,625
(
±
0.02%)
5.0MHz
0 IRE
PAL M
3.579545MHz
60Hz
525
15,750
(
±
0.0003%)
4.2MHz
7.5 IRE
PAL N
4.43361875MHz
50Hz
625
15,625
(
±
0.15%)
4.2MHz
7.5 IRE
Special
Combination
PAL N
3.58205625MHz
50Hz
625
15,750
(
±
0.15%)
4.2MHz
7.5 IRE
O
V
VIDEO INPUT
LOW TIME
COUNTER
VSYNC
FIELD
VSYNC DETECT
THRESHOLD
‘EVEN’ FIELD
6.5 LINES
FIGURE 7. VSYNC TIMING AND THE EVEN TO ODD TRANSITION
O
V
VIDEO INPUT
LOW TIME
COUNTER
VSYNC
FIELD
VSYNC DETECT
THRESHOLD
‘ODD’ FIELD
6.5 LINES
FIGURE 8. VSYNC TIMING AND THE ODD TO EVEN TRANSITION
HMP8112
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|---|---|
| HMP8156EVAL2 | NTSC/PAL Video Decoder |
| HMP8156EVAL1 | NTSC/PAL Encoders |
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| 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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