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參數資料
| 型號： | ADV7392EBZ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, Chip Scale 10-Bit SD/HD Video Encoder |
| 中文描述： | 低功耗，芯片尺寸10位標清/高清視頻編碼器 |
| 文件頁數： | 54/96頁 |
| 文件大小： | 1209K |
| 代理商： | ADV7392EBZ |
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ADV7390/ADV7391/ADV7392/ADV7393
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 to have 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
= desired gamma corrected output
x
INPUT
= linear input signal
γ
= gamma correction factor
Rev. 0 | Page 54 of 96
To program the gamma correction registers, calculate the
10 programmable curve values using the following formula:
16
where:
γ
n
= 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
= 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 72 and Figure 73 are examples only;
any user-defined curve in the range from 16 to 240 is acceptable.
16
)
16
240
(
16
240
+
×
=
γ
γ
n
n
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 72. 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 73. Signal Input (Ramp) and Selectable Output Curves
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7392WBCPZ | 制造商:Analog Devices 功能描述: |
| ADV7392WBCPZ-REEL | 制造商:Analog Devices 功能描述: |
| ADV7393 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Chip Scale 10-Bit SD/HD Video Encoder |
| ADV7393BCPZ | 功能描述:IC DAC VIDEO HDTV 10BIT 40LFCSP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7393BCPZ-REEL | 功能描述:IC DAC ENCODER VID HDTV 40-LFCSP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
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