UG-707
ADV8005 Hardware Reference Manual
Figure 121: Signal Input (Ramp) and Selectable Output Curves
7.4.17.1.
ED/HD Gamma Correction
To enable the gamma correction curves for ED/HD standards,
must be programmed.
gamma_en_hdtv
, Encoder Map,
Address 0xE435[5]
This bit is used to enable the gamma correction curves for ED/HD video data.
Function
gamma_en_hdtv
Description
0 (default)
Disabled
1
Enabled
The ED/HD gamma correction curves are provided in
Table 78: ED/HD Gamma Curve A
Curve Type
Point
Register Address
ED/HD Gamma Curve A
(A0 – Point 24)
0xE444
ED/HD Gamma Curve A
(A1 – Point 32)
0xE445
ED/HD Gamma Curve A
(A2 – Point 48)
0xE446
ED/HD Gamma Curve A
(A3 – Point 64)
0xE447
ED/HD Gamma Curve A
(A4 – Point 80)
0xE448
ED/HD Gamma Curve A
(A5 – Point 96)
0xE449
ED/HD Gamma Curve A
(A6 – Point 128)
0xE44A
ED/HD Gamma Curve A
(A7 – Point 160)
0xE44B
ED/HD Gamma Curve A
(A8 – Point 192)
0xE44C
ED/HD Gamma Curve A
(A9 – Point 224)
0xE44D
Table 79: ED/HD Gamma Curve B
Curve Type
Point
Register Address
ED/HD Gamma Curve B
(B0 – Point 24)
0xE44E
ED/HD Gamma Curve B
(B1 – Point 32)
0xE44F
ED/HD Gamma Curve B
(B2 – Point 48)
0xE450
ED/HD Gamma Curve B
(B3 – Point 64)
0xE451
ED/HD Gamma Curve B
(B4 – Point 80)
0xE452
ED/HD Gamma Curve B
(B5 – Point 96)
0xE453
ED/HD Gamma Curve B
(B6 – Point 128)
0xE454
ED/HD Gamma Curve B
(B7 – Point 160)
0xE455
ED/HD Gamma Curve B
(B8 – Point 192)
0xE456
ED/HD Gamma Curve B
(B9 – Point 224)
0xE457
LOCATION
0
0
50
100
150
200
250
300
50
100
150
200
250
G
AM
M
A
CO
RRE
CT
E
D
AM
P
L
IT
UDE
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
VARIOUS GAMMA VALUES
0.3
0.5
1.5
1.8
SIGN
AL
INP
UT
06398-
072
Rev. A | Page 264 of 317
