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TW2802 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers |
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TW2802 Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers |
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13 / 80 page  Preliminary TW2804/TW2802 Multiple Video Decoder Techwell, Inc. www.techwellinc.com 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 x 10 6 -15 -10 -5 0 5 10 Frequency (Hertz) Fig. 5 The Characteristics of IF-compensation Filter |
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