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TVP5146PFP Datasheet(PDF) 21 Page - Texas Instruments |
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TVP5146PFP Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 100 page  2−6 2.2.2.2 Y/C Separation Y/C separation may be done using adaptive 5-line (5-H delay) comb filters or a chroma trap filter. The comb filter can be selectively bypassed in the luma or chroma path. If the comb filter is bypassed in the luma path, then chroma trap filters are used which are shown in Figure 2−8 through Figure 2−11. TI’s patented adaptive comb filter algorithm reduces artifacts such as hanging dots at color boundaries. It detects and properly handles false colors in high frequency luminance images such as a multiburst pattern or circle pattern. Adaptive comb filtering is the recommended mode of operation. f − Frequency − MHz −40 −35 −30 −25 −20 −15 −10 −5 0 5 10 01234567 No Notch Filter Notch3 Filter Notch2 Filter Figure 2−8. Chroma Trap Filter Frequency Response, NTSC Square Pixel Sampling Notch1 Filter f − Frequency − MHz −40 −35 −30 −25 −20 −15 −10 −5 0 5 10 01234567 No Notch Filter Notch3 Filter Notch1 Filter Figure 2−9. Chroma Trap Filter Frequency Response, NTSC ITU-R BT.601 Sampling Notch2 Filter Figure 2−10. Chroma Trap Filter Frequency Response, PAL ITU-R BT.601 Sampling Figure 2−11. Chroma Trap Filter Frequency Response, PAL Square Pixel Sampling f − Frequency − MHz −40 −35 −30 −25 −20 −15 −10 −5 0 5 10 01234567 No Notch Filter Notch2 Filter Notch1 Filter Notch3 Filter f − Frequency − MHz −40 −35 −30 −25 −20 −15 −10 −5 0 5 10 01234567 No Notch Filter Notch 2 Filter Notch 1 Filter Notch 3 Filter |
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