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參數(shù)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(shù)字視頻譯碼器) |
| 中文描述： | NTSC / PAL數(shù)字視頻解碼器（的NTSC / PAL制式數(shù)字視頻譯碼器） |
| 文件頁數(shù)： | 13/48頁 |
| 文件大?。?/td> | 369K |
| 代理商： | MSM7662 |
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Semiconductor
MSM7662
13/47
If an S-video signal is input, these Y/C separation circuits are bypassed.
The functions of this block only operate when lines are valid as image information. During the
V blanking interval, CVBS signals are not processed.
2. Luminance Block
The luminance block removes synchronous signals from signals containing luminance components
after Y/C separation. The signals are compensated and then output as luminance signals. Two
modes of gain control functions can be selected for the luminance signal output level: AGC (Auto
Gain Control) and MGC + Pedestal Clamp.
In the AGC mode, luminance level amplification is determined by comparing the SYNC depth
with a reference value. The default is 40IRE and can be changed by the register setting. The input
has a sync chip clamp.
In the MGC + Pedestal Clamp mode, the signal output level is clamped to the pedestal level of
the input. Signal amplification and black level can be changed from the clamped position by
register settings.
This block can select the follwing operating modes.
1) Selection of prefilter and sharp filter usage
Do not use*
Use
These filters are used to enhance the edges of luminance component signals.
2) Selection of aperture bandpass filter coefficient
Middle range*
High range
3) Coring range selection
Off*
±
4LBS
±
5LBS
±
7LBS
4) Aperture weighting coefficient selection
0*
0.25
0.75
1.5
Both coring and aperture compensation processes perform contour compensation.
5) Selection of pixel position compensating circuit usage
Use*
Do not use
6) AGC loop filter time constant selection
Slow
coefficient value
1/1024n
Medium
1/64n*
Fast
1/n
Fixed
0
Fixed: manual gain setting is possible
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