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參數(shù)資料
| 型號(hào)： | ADV7322 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat 11-Bit HDTV Video Encoder |
| 中文描述： | 多格式11位高清晰度電視視頻編碼器 |
| 文件頁(yè)數(shù)： | 52/88頁(yè) |
| 文件大小： | 991K |
| 代理商： | ADV7322 |
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ADV7322
Preliminary Technical Data
increments of 0.17578125°. For normal operation (zero
adjustment), this register is set to 0x80. Values 0xFF and 0x00
represent the upper and lower limits (respectively) of
adjustment attainable.
Rev. PrA | Page 52 of 88
Hue Adjust (°) = 0.17578125° (
HCR
d
128) for positive hue
adjust value.
For example, to adjust the hue by +4°, write 0x97 to the Hue
Adjust Value register:
97
x
0
105
128
17578125
.
4
=
=
+
d
.
where the sum is rounded to the nearest integer.
To adjust the hue by 4°, write 0x69 to the Hue Adjust Value
register:
69
x
0
105
128
17578125
.
4
=
=
+
d
where the sum is rounded to the nearest integer.
SD Brightness Control
[Subaddress 0x61]
The brightness is controlled by adding a programmable setup
level onto the scaled Y data. This brightness level may be added
onto the scaled Y data. For NTSC with pedestal, the setup can
vary from 0 IRE to 22.5 IRE. For NTSC without pedestal and
PAL, the setup can vary from 7.5 IRE to +15 IRE.
The brightness control register is an 8-bit register. Seven bits of
this 8-bit register are used to control the brightness level. This
brightness level can be a positive or negative value.
For example,
1. To add +20 IRE brightness level to an NTSC signal with
pedestal , write 0x28 to Address 0x61, SD brightness.
0x[
SD Brightness Value
] =
0x[
IRE Value
× 2.015631] =
0x[20 × 2.015631] = 0x[40.31262] = 0x28
2. To add –7 IRE brightness level to a PAL signal, write 0x72 to
Address 0x61, SD brightness.
[
IRE Value| ×
2.075631
[7 × 2.015631] = [14.109417] = 0001110
b
[0001110]
into twos complement
= [1110010]
b
= 0x72
Table 32. Brightness Control Values
1
Setup Level In
NTSC with
Pedestal
Pedestal
22.5 IRE
15 IRE
15 IRE
7.5 IRE
7.5 IRE
0 IRE
0 IRE
–7.5 IRE
Setup Level In
NTSC No
Setup
Level In
PAL
15 IRE
7.5 IRE
0 IRE
–7.5 IRE
SD
Brightness
0x1E
0x0F
0x00
0x71
1
Values in the range from 0x3F to 0x44 might result in an invalid output
signal.
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