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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)： | 12/48頁 |
| 文件大?。?/td> | 369K |
| 代理商： | MSM7662 |
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Semiconductor
MSM7662
12/47
Decoder Unit
1. Prologue Block
The prologue block inputs data and performs Y/C separation.
Data can be input at either the pixel frequency (ITU-R: 13.5 MHz) or at twice the pixel frequency
(ITU-R: 27 MHz). If input at twice the pixel frequency, data is processed after passing through
a decimator circuit to convert it to the pixel frequency. The decimator circuit may be bypassed
by changing the register setting, regardless of whether data is input at the normal pixel frequency
or at twice the pixel frequency.
If a composite signal (CVBS) is input, the default setting performs Y/C separation using a 2-
dimensional adaptive comb filter.
The following operating modes can be selected via the I
2
C-bus. Default settings are indicated by
an asterisk (*). The default state is selected at reset.
1) Video input mode selection
Composite video input *
S-video input
2) Video input mode selection
NTSC/PAL auto-select* (only for ITU-R.601)
Dependent upon operating mode selected
When ITU-R.601 is selected, the video input mode is automatically set depending upon the
number of lines per field.
3) Operating mode selection
NTSC ITU-R.601
NTSC Square Pixel
NTSC 4fsc
PAL ITU-R.601
PAL Square Pixel
4) Decimator circuit pass/bypass selection
Pass through decimator circuit*
Bypass decimator circuit
5) Y/C separation mode selection
Use adaptive comb filter*
Use non-adaptive comb filter
Do not use comb filter (use trap filter)
13.5 MHz*
12.27 MHz
14.31818 MHz
13.5 MHz
14.75 MHz
The adaptive comb filter makes the correlation between up to 3 consecutive lines (only 2 lines in
the case of a PAL signal). If there is correlation, Y/C separation is performed by the comb filter
according to the format of correlation.
The non-adaptive comb filter performs Y/C separation by removing the luminance component
based on the average of preceding and following lines (when there is correlation between 3 lines).
When a comb filter is not used, Y/C separation is performed by a trap filter.
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