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| HMP8117 Datasheet, PDF (32/45 Pages) Intersil Corporation – NTSC/PAL Video Decoder | |||
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HMP8117
TABLE 38. VIDEO GAIN ADJUST REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 1DH
DESCRIPTION
RESET
STATE
7-0
Video Gain Adjust This register is enabled by the selection of âfixed gain controlâ mode in the Analog Input Control
80H
register 05H bits 7-4. The value of this register selects a combined analog attenuation and a
digital gain factor which is applied to both Luma and Chroma input channels. The gain factor is
selected from nonlinear lookup table and may range in value from 0.5x (CEH) to 1.99x (33H).
Refer to Table 39 below. The Register Values in italics below mark the approximate analog
attenuation ladder switching points.
Video
Gain
Reg.
Value
Video
Gain
TABLE 39. VIDEO GAIN REGISTER LOOKUP TABLE
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
0.50 206/CEH
0.51 202/CAH
0.52 197/C5H
0.53 193/C1H
0.54 191/BFH
0.55 187/BBH
0.56 183/B7H
0.57 180/B4H
0.58 178/B2H
0.59 174/AEH
0.60 171/ABH
0.61 169/A9H
0.62 167/A7H
0.63 164/A4H
0.64 161/A1H
0.65 159/9FH
0.66 156/9CH
0.67
153/99H
0.84
123/7BH
1.03
100/64H
1.23
83/53H
1.55
66/42H
0.68
151/97H
0.85
121/79H
1.04
99/63H
1.25
82/52H
1.57
65/41H
0.69
150/96H
0.86
119/77H
1.05
98/62H
1.27
81/51H
1.59
64/40H
0.70
147/93H
0.87
118/76H
1.06
97/61H
1.28
80/50H
1.63
63/3FH
0.71
145/91H
0.88
117/75H
1.07
96/60H
1.30
79/4FH
1.65
62/3EH
0.72
143/8FH
0.89
115/73H
1.08
95/5FH
1.31
78/4EH
1.67
61/3DH
0.73
141/8DH
0.90
114/72H
1.09
94/5EH
1.33
77/4DH
1.70
60/3CH
0.74
139/8BH
0.91
113/71H
1.10
93/5DH
1.34
76/4CH
1.73
59/3BH
0.75
137/89H
0.92
111/6FH
1.12
92/5CH
1.37
75/4BH
1.76
58/3AH
0.76
136/88H
0.94
110/6EH
1.13
91/5BH
1.38
74/4AH
1.79
57/39H
0.77
134/86H
0.95
109/6DH
1.14
90/5AH
1.40
73/49H
1.82
56/38H
0.78
132/84H
0.96
107/6BH
1.15
89/59H
1.42
72/48H
1.86
55/37H
0.79
130/82H
0.97
106/6AH
1.16
88/58H
1.44
71/47H
1.89
54/36H
0.80
128/80H
0.98
104/68H
1.18
87/57H
1.46
70/46H
1.93
53/35H
0.81
126/7EH
1.00
103/67H
1.20
86/56H
1.48
69/45H
1.97
52/34H
0.82
125/7DH
1.01
102/66H
1.21
85/55H
1.51
68/44H
1.99
51/33H
0.83
124/7CH
1.02
101/65H
1.22
84/54H
1.52
67/43H
BIT
NO.
FUNCTION
7-6
Reserved
5-0
Sharpness
Adjust
TABLE 40. SHARPNESS ADJUST REGISTER
SUB ADDRESS = 1EH
DESCRIPTION
Specifies the amount of high frequency gain control for luminance signals (either 2.6MHz or
FSC), as determined by the Luma Processing register 08H. The gain ranges from +12dB (11
1111B) to -12dB (00 0100B). A value of 0dB (â01 0000â) has no effect on the data.
RESET
STATE
00B
010000B
32
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