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ADV7189B Datasheet(PDF) 29 Page - Analog Devices |
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ADV7189B Datasheet(HTML) 29 Page - Analog Devices |
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29 / 104 page  ADV7189B Rev. B | Page 29 of 104 0 –10 –20 –30 –40 –50 –60 –70 010 8 6 4 212 FREQUENCY (MHz) COMBINED Y ANTIALIAS, S-VHS LOW-PASS FILTERS, Y RESAMPLE Figure 12. Y S-VHS Combined Responses The filter plots in 178H Figure 12 show the S-VHS 1 (narrowest) to S-VHS 18 (widest) shaping filter settings. 179H Figure 14 shows the PAL notch filter responses. The NTSC-compatible notches are shown in 180H Figure 15. 0 –20 –40 –60 –80 –100 –120 010 8 6 4 212 FREQUENCY (MHz) COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER, Y RESAMPLE Figure 13. Y S-VHS 18 Extra Wideband Filter (CCIR 601 Compliant) 0 –10 –20 –30 –40 –50 –60 –70 010 8 6 4 212 FREQUENCY (MHz) COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS, Y RESAMPLE Figure 14. PAL Notch Filter Response 0 –10 –20 –30 –40 –50 –60 –70 010 8 6 4 212 FREQUENCY (MHz) COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS, Y RESAMPLE Figure 15 . NTSC Notch Filter Response CHROMA FILTER Data from the digital fine clamp block is processed by three sets of filters. Note: the data format at this point is CVBS for CVBS inputs, or chroma only for Y/C or Cr/Cb interleaved for YCrCb input formats. • Chroma Antialias Filter (CAA). The ADV7189B over- samples the CVBS by a factor of 2 and the Chroma/UV by a factor of 4. A decimating filter (CAA) is used to preserve the active video band and to remove any out-of- band components. The CAA filter has a fixed response. • Chroma Shaping Filters (CSH). The shaping filter block can be programmed to perform a variety of low-pass responses. It can be used to selectively reduce the band- width of the chroma signal for scaling or compression. • Digital Resampling Filter. This block is used to allow dynamic resampling of the video signal to alter parameters such as the time base of a line of video. Fundamentally, the resampler is a set of low-pass filters. The actual response is chosen by the system without user intervention. The plots in 181H Figure 16 show the overall response of all filters together. |
Similar Part No. - ADV7189B_15 |
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Similar Description - ADV7189B_15 |
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