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參數資料
| 型號： | MSM7662 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | NTSC/PAL Digital Video Decoder(NTSC/PAL制式數字視頻譯碼器) |
| 中文描述： | NTSC / PAL數字視頻解碼器（的NTSC / PAL制式數字視頻譯碼器） |
| 文件頁數： | 14/48頁 |
| 文件大?。?/td> | 369K |
| 代理商： | MSM7662 |
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Semiconductor
MSM7662
14/47
7) Parameter for fine adjustment of AGC sync depth
8) Parameter for fine adjustment of sync removal level
The black level is adjusted. The default setting outputs the pedestal position as a black level
(=16).
9) Pedestal clamp selection
Do not use pedestal clamp*
Use pedestal clamp (at this time, AGC does not operate, MGC operates)
3. Chrominance Block
This block processes the chroma signals.
The following operating modes can be selected.
1) Selection of color bandpass filter usage
Do not use*
Use
2) ACC loop filter time constant selection
Slow
coefficient value
Medium
Fast
Fixed
Fixed: manual gain setting is possible
3) ACC reference level fine adjustment
4) Parameter for burst level fine adjustment
5) Threshold level at which chroma amplitude becomes valid is selected based upon color burst
ratio.
0.5
0.25*
0.125
Off
Off: The color killer function is turned off. If decoloration occurs while decoding a still picture,
setting the threshold level to "off" will reduce the decoloration.
6) Color killer mode selection
Auto color killer mode*
Forced color killer
7) Parameter for fine adjustment of color subcarrier phase
1/1024m
1/64m*
1/m
0
In this block, chroma signals pass through a bandpass filter to cut out unnecessary band.
To maintain a constant chroma level, these signals then pass through an ACC compensating
circuit and are UV demodulated. (The filter can be bypassed.)
If the demodulated result does not reach a constant level, color killer signals are generated to fix
the ACC gain. This functions as an auto color killer control circuit.
The UV demodulated results pass through a low-pass filter and are output as chrominance
signals.
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