參數(shù)資料
型號: TW2802
廠商: Electronic Theatre Controls, Inc.
英文描述: TW2802/4 Multiple Video Decoder For Security Applications
中文描述: TW2802 / 4多路視頻解碼器的安全應用
文件頁數(shù): 12/80頁
文件大?。?/td> 946K
代理商: TW2802
www.techwellinc.com
Preliminary
TW2804/TW2802 Multiple Video Decoder
Techwell, Inc.
Datasheet Rev. 2.4
09/09/2003
12
Luminance Processing
The luminance signal is separated by adaptive comb or trap filter is then fed to a peaking circuit.
The peaking filter enhances the high frequency components of the luminance signal. Fig. 4
shows the characteristics of the peaking filter for four different gain modes. The picture contrast
and brightness adjustment is provided through CONT (0x11, 0x51, 0x91, 0xD1) and BRT (0x12,
0x52, 0x92, 0xD2) registers. The contrast adjustment range is from approximately 0 to 200
percent, and the brightness adjustment is in the range of ±25 IRE. Moreover, a high frequency
coring function is also embedded in TW280X to minimize a high frequency noise. The coring
level is adjustable through the Y_H_CORE (0xF8) register.
0
1
2
3
4
5
6
x 10
6
0
1
2
3
4
5
6
Frequency (Hertz)
M
Fig. 4. The Characteristic of Luminance Peaking filter
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