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參數資料
| 型號： | ADV7324 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs |
| 中文描述： | 多格式視頻編碼器216兆赫六噪聲整形的14位DAC |
| 文件頁數： | 54/92頁 |
| 文件大小： | 992K |
| 代理商： | ADV7324 |
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ADV7324
For lengths of 16 to 240 points, the gamma correction curve is
calculated as follows:
Rev. 0 | Page 54 of 92
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
.
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 only examples;
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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