參數(shù)資料
型號(hào)： ADV7322KSTZ1
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
文件頁數(shù)： 55/88頁
文件大小： 991K
代理商： ADV7322KSTZ1
Preliminary Technical Data
ADV7322
For the length of 16 to 240, the gamma correction curve has to
be calculated as follows:
Rev. PrA | Page 55 of 88
y
=
x
γ
where:
y
= gamma corrected output
x
= linear input signal
γ = gamma power factor
To program the gamma correction registers, calculate the seven
values for
y
using the following formula:
16
)
16
240
(
)
16
240
(
)
16
(
+
×
γ
=
n
n
x
y
where:
x
(
n
16) = Value for x along x axis at points
n
= 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224
y
n
= Value for y along the y axis, which must be written into the
gamma correction register
For example,
y
24
= [(8/224)0.5 × 224] + 16 = 58
y
32
= [(16/224)0.5 × 224] + 16 = 76
y
48
= [(32/224)0.5 × 224] + 16 = 101
y
64
= [(48/224)0.5 × 224] + 16 =120
y
80
= [(64 / 224)0.5 × 224] + 16 =136
y
96
= [(80 / 224)0.5 × 224] + 16 = 150
y
128
= [(112 / 224)0.5 × 224] + 16 = 174
y
160
= [(144 / 224)0.5 × 224] + 16 = 195
y
192
= [(176 / 224)0.5 × 224] + 16 = 214
y
224
= [(208 / 224)0.5 × 224] + 16 = 232
where the sum of each equation is rounded to the nearest
integer.
The gamma curves in Figure 70 and Figure 71 are examples only;
any user-defined curve is acceptable in the range of 16 to 240.
LOCATION
00
50
100
150
200
250
300
50
100
150
200
250
0.5
SIGNAL INPUT
G
SIGNAL OUTPUT
GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT
0
Figure 70. Signal Input (Ramp) and Signal Output for Gamma 0.5
LOCATION
00
50
100
150
200
250
300
50
100
150
200
250
G
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
VARIOUS GAMMA VALUES
0.3
0.5
1.5
1.8
SGNALINPUT
0
Figure 71. Signal Input (Ramp) and Selectable Output Curves
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