HMP8117 Datasheet, PDF (26/45 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8117
TABLE 17. COLOR PROCESSING REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 06_H
DESCRIPTION
RESET
STATE
7-6
Digital Color Gain 00 = No gain control (gain = 1x)
01_B
Control Select
01 = Automatic gain control
10 = Fixed gain control. (Use gain factor from Color Gain Adjust register 1C_H.)
11 = Freeze automatic gain control
5-4
Color Killer
00 = Force color on
01_B
Select
01 = Enable color killer
10 = reserved
11 = Force color off
3-2
Color Coring
Coring may be used to reduce low-level noise in the CbCr signals.
00_B
Select
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
1
Contrast Control This bit specifies whether the contrast control affects just the Y data (“0”) or both the Y and CbCr
1_B
Select
data (“1”). To avoid color shifts when changing contrast, this bit should be a “1”.
0 = Contrast controls only Y data
1 = Contrast controls Y and CbCr data
0
Color Low-Pass
This bit selects the bandwidth of the CbCr data.
0_B
Filter Select
0 = 850kHz
1 = 1.5MHz
TABLE 18. LUMA PROCESSING REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 08_H
DESCRIPTION
RESET
STATE
7-6
Y Filtering
Select
The chroma trap filter may be used to remove any residual color subcarrier information from the
00_B
Y channel. During S-video operation, it should be disabled. During PAL operation, it should be
enabled. The 3MHz low-pass filter may be used to remove high-frequency noise.
00 = No filtering
01 = Enable chroma trap filter
10 = Enable 3.0MHz low-pass filter
11 = reserved
5-4
Black Level Y
Coring may be used to reduce low-level noise around black in the Y signal.
00_B
Coring Select
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
3-2
High Frequency Y Coring may be used to reduce high-frequency low-level noise in the Y signal.
01_B
Coring Select
00 = No coring
01 = 1 code coring
10 = 2 code coring
11 = 3 code coring
1-0
Sharpness
Specifies the amount of sharpness to be applied per the Sharpness Adjust register 1E_H.
00_B
Frequency Select 00 = Bypass sharpness control10 = Maximum gain at color F_SC
01 = Maximum gain at 2.6MHz11 = reserved
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