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TMC22X5YA Datasheet(PDF) 42 Page - Fairchild Semiconductor |
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TMC22X5YA Datasheet(HTML) 42 Page - Fairchild Semiconductor |
42 / 84 page TMC22x5yA PRODUCT SPECIFICATION 42 REV. 1.0.0 2/4/03 phase relationship to the chroma on 1H. Therefore normally 0H and 2H are added together to produce the average luma across 3 lines and this is then subtracted from 1H to produce the combed chroma. Figure 7. Chrominance Vector Rotation in PAL and NTSC YC Line-Based Comb Filters The luminance and chrominance signals, are by definition, already separated for YC inputs. However, if the original source was composite, there is a distinct possibility that there is some residual luminance (cross color) in the chrominance signal and some residual chrominance (cross luma) in the luminance signal. It is therefore legitimate to treat these signals as if they were simply the output from bandsplit filters and process the luma and chroma signals accordingly. D1 Line-Based Comb Filters A D1 data stream consists of multiplexed Y, CB and CR component data. If the original source was composite there maybe luminance (cross color) in CBCR and chrominance (cross luma) in Y. In the first case any luminance that was passed through a demodulator along with the chroma to produce the baseband CBCR color difference signals would have the same characteristics as chroma. That is to say, the cross color would advance by 180 ° every line in NTSC and every 2 lines in PAL. It is therefore possible to remove this cross color in a comb filter. In the latter case any chromi- nance that is still in the Y data can obviously be removed in a comb filter as well. The original source for the D1 signal could also have been computer graphics. In this case, the comb filter can be used to remove the picture flicker and convert the output to RGB. NTSC Frame and Field Based Decoders Composite Frame-Based Comb Filters In NTSC the chrominance vectors advance by 180 degrees every line, therefore after 525 lines the 2 adjacent frame lines 0H and FR0H and the two consecutive field lines FR0H and FR1H are 180 degrees apart. The flat color on FR0H and FR1H can be added or subtracted to provide the luminance or chrominance to subtract from 0H. Figure 8. Chrominance Vector Rotation Over 4 Fields in NTSC Composite Field-Based Comb Filters In NTSC field based comb decoders, there is an external delay of 263 lines, therefore the 2 adjacent picture lines 0H and F0H and the two consecutive field lines F0H and F1H are 180 degrees apart. The flat color on F0H and F1H can be added or subtracted to provide the luminance or chromi- nance to subtract from 0H. PAL Field Decoders Composite, PAL Field Comb Filters In PAL field based comb decoders, there is an external delay of 312 lines, therefore the 2 adjacent picture lines 0H and F0H are 180 degrees apart. In fields 5, 6, 7, and 8 the U and V vectors are 180 degrees advanced from fields 1, 2, 3, and 4. Figure 9. Chrominance Vector Rotation Over 4 Fields in PAL PAL NTSC LINE no V U V U Q Q Q Q I I I V U V U V U N+1 N N+2 N+3 N+4 M M+1 M+2 M+3 2H 1H 0H 65-22x5y-48 FIELD 0 0 0 0 0 1 1 1 1 LINE no Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q I I I I I I I I I I I I I I I I 22 21 23 24 283 284 285 286 FIELD 1 FIELD 2 FIELD 3 FIELD 4 (1H) (0H) (F1H) (F0H) (FR1H) (FR0H) 65-22x5y-49 V V V U V V U U U V V V V U U V V U U U U V V V U U U U 24 23 25 26 336 337 338 65-22x5y-50 LINE no FIELD 1 FIELD 2 FIELD 3 FIELD 4 (0H) (F0H) (FR0h) (FR0H) |
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