MSM7660 데이터 시트보기 (PDF) - Oki Electric Industry
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MSM7660 Datasheet PDF : 35 Pages
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¡ Semiconductor
MSM7660
BLOCK DESCRIPTION
1.
Prologue Block
The prologue Block performs Y/C separation using a 2-dimentional adaptive comb filter when
composite signals (CVBS) are input.
The following operation modes can be changed via the I2C-bus. The * mark indacates a default.
The default is a state that is selected when reset.
1) Video input mode select
Composite video input *
S video input
2) Video input mode select
NTSC system*
PAL system
3) Operation mode select
NTSC ITU recommendation BT.601
MTSC Square Pixel
NTSC 4Fsc
PAL ITU recommendation BT.601
PAL Square Pixel
13.5MHz*
12.27MHz
14.32 MHz
13.5MHz
14.75 MHz
4) Y/C separation mode select
Adaptive comb filter is used. *
Unadaptive comb filter is used.
Comb filter is not used.
The adaptive comb filter detects the correlation up to 3 lines between continuous lines. The Y/
C is separated by the comb filter according to the way of correlation if theses lines are correlated.
The Y/C is separated by the trap filter if these lines are not correlated not correlated (only 2 lines
in the case of PAL).
In the unadaptive comb filter, the Y/C is always separated by removing the luminance
component based on the average of preceding and following lines (when there is the correlation
between 3 lines).
If the comb filter is not used, the Y/C is separated by the trap filter.
The Y/C separation circuit is bypassed by S video signal input.
In adittion, the functions of this block work only when lines are valid as image information.
The processing of CVBS signals is not made during V-blanking.
2.
Luminance Block
The luminance block removes synchronous signals from the signals containing luminance
components after Y/C separation. The signals are corrected and output as luminance signals.
This block can select the follwing operation modes.
1) Use of prefilter and sharp filter
Used*
Not used
These filters are used for enhancing the edges of luminance component signals.
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