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DDP3300A Datasheet(PDF) 8 Page - Micronas |
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DDP3300A Datasheet(HTML) 8 Page - Micronas |
8 / 53 page PRELIMINARY DATA SHEET DDP 3300 A MICRONAS INTERMETALL 8 2.1.4. Dynamic Peaking Especially with decoded composite signals and notch fil- ter luminance separation, as input signals, it is neces- sary to improve the luminance frequency characteris- tics. With transparent, high-bandwidth signals, it is sometimes desirable to soften the image. In the DDP 3300 A, the luma 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 ampli- tudes 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 sepa- rate adjustment for signal overshoot and for signal un- dershoot. 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 for notch filter color decoding, the total system frequency responses for both PAL and NTSC are shown in figure 2–4. Transients, produced by the dynamic peaking when switching video source signals, can be suppressed via the priority bus. Fig. 2–3:Dynamic peaking frequency response 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= 3.2 MHz CF= 2.5 MHz S-VHS 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= 3.2 MHz CF= 2.5 MHz PAL/SECAM 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= 3.2 MHz Fig. 2–4:Total frequency response for peaking filter and S-VHS, PAL, NTSC NTSC |
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