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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA8501 датащи(PDF) 8 Page - NXP Semiconductors |
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TDA8501 датащи(HTML) 8 Page - NXP Semiconductors |
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8 / 30 page  April 1993 8 Philips Semiconductors Preliminary specification PAL/NTSC encoder TDA8501 CHROMINANCE BLANKING The signal outputs from the modulators are connected to the signal input of the chrominance blanking circuit. To avoid signal distortion that may be caused by the control loop, the signal outputs of the modulators are blanked during the sync period. This prevents signal distortion during the adding of the sync pulse at the CVBS output circuit. BANDPASS FILTER A wide symmetrical bandpass filter is used so that a maximum performance of the chrominance for Y +C (SVHS) is guaranteed. This wide curve is possible because of the minimal signal level of the harmonics within the modulators see Figs (PAL mode: 5 and 6); (NTSC mode: 7 and 8) which illustrate the nominal response for PAL and NTSC modes. Fig.5 Band pass filter nominal frequency response (PAL mode). Fig.6 Band pass filter nominal frequency/group delay response (PAL mode). (1) frequency response. (2) group delay. |
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