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參數資料
| 型號： | AD7183 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Advanced Video Decoder with 10-Bit ADC and Component Input Support |
| 中文描述： | 先進的視頻解碼器，10位ADC和組件輸入支持 |
| 文件頁數： | 11/41頁 |
| 文件大小： | 484K |
| 代理商： | AD7183 |
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REV. 0
ADV7183
–11–
LUMINANCE PROCESSING
Figure 7 shows the luminance data path. The 10-bit data from
the Y ADC is applied to an antialiasing low pass filter that is
designed to band-limit the input video signal such that aliasing
does not occur. This filter dramatically reduces the design on an
external analog antialaising filter; this filter need only remove
components in the input video signal above 22 MHz. The data
then passes through a shaping or notch filter.
When in CVBS mode a notch filter must be used to remove the
unwanted chrominance data that lies around the subcarrier
frequency. A wide variety of programmable notch filters for
both PAL and NTSC are available. The YSFM[4:0] control the
selection of these filters; refer to Figures 8 to 16 for plots of
these filters. If S-video or component mode is selected a notch
filter is not required. The ADV7183 offers 18 possible shaping
filters (SVHS1-18) with a range of low pass filter responses from
0.5 MHz up to 5.75 MHz. The YSFM[4:0] control the selec-
tion of these filters. Please refer to Figures 8 through 16 for
filter plots.
The next stage in the luminance processing path is a peaking
filter; this filter offers a sharpness function on the luminance
path. The degree of sharpness can be selected using YPM[2:0].
If no sharpness is required, this filter can be bypassed.
The luminance data is then passed through a resampler to correct
for line length variations in the input video. This resampler is
designed to always output 720 pixels per line for standard PAL or
NTSC. The resampler used on the ADV7183 is of very high
quality as it uses 128 phases to resample the video, giving 1/128
pixel resolution. The resampler is controlled by a sync detection
block that calculates line length variations on the input video.
The final stage in the luminance path, before it is applied to an
output formatter block, is a two-line delay store that is used to
compensate for delays in the chroma data path when chroma
comb filter is selected.
ANTI-
ALIASING
LPF
SHAPING
AND
NOTCH
FILTER
PEAKING
FILTER
RESAMPLE
DELAY
LINE
STORES
SYNC
DETECTION
Y
ADC DATA
Figure 7. Luminance Processing Path
FREQUENCY
–
MHz
0
–
600
8
1
A
–
2
3
4
5
6
7
–
10
–
20
–
30
–
40
–
50
SVHS1
SVHS2
SVHS3
SVHS4
SVHS5
SVHS6
SVHS7
SVHS8
SVHS9
SVHS10
SVHS11
SVHS12
SVHS13
SVHS14
SSVHS16
SVHS17
SVHS18
Figure 8. Luminance SVHS1–18 Shaping Filter
Responses
FREQUENCY
–
MHz
1.0
–
1.00
6
1
A
–
2
3
4
5
0.8
0.2
–
0.4
–
0.6
–
0.8
0.6
0.4
0
–
0.2
Figure 9. Luminance SVHS1–SVHS18 Shaping
Filter Responses (Close-Up)
FREQUENCY
–
MHz
0
–
600
8
1
A
–
2
3
4
5
6
7
–
10
–
20
–
30
–
40
–
50
NTSC WN1
NTSC WN2
NTSC WN3
NTSC NN1
NTSC NN2
NTSC NN3
NTSC WN2
NTSC NN3
NTSC WN1
NTSC NN2
NTSC NN1
NTSC WN3
Figure 10. Luminance NTSC Narrow/Wide Notch
Shaping Filter
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