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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VDP3133Y датащи(PDF) 16 Page - Micronas |
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VDP3133Y датащи(HTML) 16 Page - Micronas |
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16 / 76 page  VDP 313xY ADVANCE INFORMATION 16 Micronas 2.10.3.Dynamic Peaking Especially with decoded composite signals and notch filter luminance separation, as input signals, it is nec- essary to improve the luminance frequency character- istics. With transparent, high-bandwidth signals, it is sometimes desirable to soften the image. In the VDP 313xY, the luminance response is improved by dynamic peaking. The algorithm has been optimized regarding step and frequency response. It adapts to the amplitude of the high frequency part. Small AC amplitudes are processed, while large AC amplitudes stay nearly unmodified. The dynamic range can be adjusted from −14 to +14 dB for small high frequency signals. There is sep- arate adjustment for signal overshoot and for signal undershoot. For large signals, the dynamic range is limited by a non-linear function that does not create any visible alias components. The peaking can be switched over to “softening” by inverting the peaking term by software. The center frequency of the peaking filter is switchable from 2.5 MHz to 3.2 MHz. For S-VHS and notch filter color decoding, the total system frequency responses for both PAL and NTSC are shown in Fig. 2–13. Transients, produced by the dynamic peaking when switching to the picture frame can be suppressed optionally Fig. 2–12: Dynamic peaking frequency response Fig. 2–13: Total frequency response for peaking filter and S-VHS, PAL, NTSC dB MHz 20 5 –5 –10 –15 –20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 dB MHz 20 5 −5 −10 −15 −20 02 4 6 8 10 15 10 0 CF=2.5 MHz CF=2.5 MHz CF=2.5 MHz CF=3.2 MHz CF=3.2 MHz CF=3.2 MHz NTSC PAL/SECAM S-VHS |
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