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TW2802 Datasheet(PDF) 13 Page - Renesas Technology Corp

Part # TW2802
Description  Multiple Video Decoder for Security Applications
PDF  81 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

TW2802 Datasheet(HTML) 13 Page - Renesas Technology Corp

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TW2802, TW2804
FN7732 Rev.1.00
Page 13 of 81
May 19, 2017
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.
Fig. 5 The Characteristics of IF-compensation Filter
Fig. 6 The Characteristics of Chrominance Low Pass Filter
1.5
2
2.5
3
3.5
4
4.5
5
5.5
x 10
6
-15
-10
-5
0
5
10
Frequency (Hertz)
0
0.5
1
1.5
2
2.5
3
3.5
4
x 10
6
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (Hertz)



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