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TW2802 Datasheet(PDF) 12 Page - List of Unclassifed Manufacturers |
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TW2802 Datasheet(HTML) 12 Page - List of Unclassifed Manufacturers |
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12 / 80 page  Preliminary TW2804/TW2802 Multiple Video Decoder Techwell, Inc. www.techwellinc.com 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) Fig. 4. The Characteristic of Luminance Peaking filter |
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