ch7003b-v Chrontel, ch7003b-v Datasheet - Page 32

• Manufacturer Part Number: ch7003b-v
• Description: Ch7003 Digital Pc To Tv Encoder
• Manufacturer: Chrontel

CHRONTEL
Flicker Filter Register
The flicker filter register provides for adjusting the operation of the scan rate conversion/flicker filter. As a function
of the CH7003 scaling/filtering architecture, the selection of scaling modes affects the available selections of flicker
filtering. When operating in non-scaling modes (i.e., modes with scaling of 1/1), the FF[1:0] selects from four
different amounts of flicker reduction. When operating in modes with scaling other than 1/1, FF[1] selects from two
different amounts of flicker reduction, where bit FF[0] is ignored in these scaling settings. The tables below show
the various flicker filter settings.
Video Bandwidth Register
This register enables the selection of alternative filters for use in the luma and chroma channels. There are currently
4 filter options defined for the chroma channel, 4 filter options in the S-Video luma channel and two filter options in
the composite luma channel. Table 20 and Table 21 show the various settings.
32
Table 18. Non-scaled Modes (1/1 ratio)
Table 19. Scaled Modes (non1/1scale ratio)
Bit:
Symbol:
Type:
Default:
00
01
10
11
0X
1X
Bit:
Symbol:
Type:
Default:
FFR[1:0]
FFR[1:0]
7
7
FLFF
R/W
0
0:1:0
1:2:1
1:3:1
1:1:1
3-line
4-line
Mode
Mode
6
6
CVBW
R/W
0
No filtering (flicker filtering is disabled)
Moderate flicker filtering (default mode)
Low flicker reduction
High flicker reduction
3-line flicker filter, moderate flicker reduction
4-line flicker filter, minimum flicker
5
5
CBW1
R/W
0
4
4
CBW0
R/W
0
Comments
Comments
3
3
YPEAK
R/W
0
201-0000-023 Rev. 4.2, 4/12/2002
2
2
YSV1
R/W
0
Symbol: FFR
Address: 01H
Bits: 2
Symbol: VBW
Address: 03H
Bits: 7
1
FF1
R/W
0
1
YSV0
R/W
0
CH7003B
0
FF0
R/W
1
0
YCV
R/W
0