參數(shù)資料
型號(hào): 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(yīng)用
文件頁(yè)數(shù): 13/80頁(yè)
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
13
Chrominance Processing
Chrominance Demodulation
The chrominance demodulation is done by first quadrature mixing for NTSC and PAL. The
mixing frequency is equal to the sub-carrier frequency of NTSC and PAL. After the mixing, a
LPF is used to remove 2X carrier signal and yield chrominance components. The LPF
characteristic can be selected for optimized transient color performance. In case of a mistuned
IF source, IF compensation filter makes up for any attenuation at higher frequencies or
asymmetry around the color sub-carrier. The gain for the upper chrominance side band is
controlled by IFCMP_MD (0x13, 0x53, 0x93, 0xD3) register. Fig. 5 and Fig. 6 show the
frequency response of IF-compensation filter and chrominance LPF.
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
x 10
-15
-10
-5
0
5
10
Frequency (Hertz)
M
Fig. 5 The Characteristics of IF-compensation Filter
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