參數(shù)資料
型號(hào)： ADV7340EBZ
廠商： Analog Devices, Inc.
英文描述： Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
中文描述： 多格式視頻編碼器，6個(gè)12位噪聲整形視頻㈢交叉連接系統(tǒng)
文件頁(yè)數(shù)： 58/88頁(yè)
文件大?。?/td> 1066K
代理商： ADV7340EBZ
ADV7340/ADV7341
SD gamma correction is enabled using Subaddress 0x88, Bit 6.
SD Gamma Correction Curve A is programmed at Subaddress
0xA6 to Subaddress 0xAF, and SD Gamma Correction Curve B
is programmed at Subaddress 0xB0 to Subaddress 0xB9.
Gamma correction is performed on the luma data only. The
user can choose one of two correction curves, Curve A or
Curve B. Only one of these curves can be used at a time. For
ED/HD gamma correction, curve selection is controlled using
Subaddress 0x35, Bit 4. For SD gamma correction, curve
selection is controlled using Subaddress 0x88, Bit 7.
The shape of the gamma correction curve is controlled by
defining the curve response at 10 different locations along the
curve. By altering the response at these locations, the shape of
the gamma correction curve can be modified. Between these
points, linear interpolation is used to generate intermediate
values. Considering the curve has a total length of 256 points,
the 10 programmable locations are at points 24, 32, 48, 64, 80,
96, 128, 160, 192, and 224. Locations 0, 16, 240, and 255 are
fixed and cannot be changed.
From curve locations 16 to 240, the values at the programmable
locations and, therefore, the response of the gamma correction
curve should be calculated to produce the following result:
x
DESIRED
= (
x
INPUT
)
γ
where:
x
DESIRED
is the desired gamma corrected output.
x
INPUT
is the linear input signal.
γ is the gamma correction factor.
Rev. 0 | Page 58 of 88
To program the gamma correction registers, calculate the
10 programmable curve values using the following formula:
16
)
16
240
(
16
240
16
+
×
=
γ
γ
n
n
where:
γ
n
is the value to be written into the gamma correction register
for point
n
on the gamma correction curve.
n
= 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224.
γ
is the gamma correction factor.
For example, setting γ = 0.5 for all programmable curve data
points results in the following
y
n
values:
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 in the range from 16 to 240 is acceptable.
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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ADV7341 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
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ADV7341EBZ 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
ADV7342 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs
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