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M52393P Datasheet(PDF) 7 Page - Mitsubishi Electric Semiconductor |
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M52393P Datasheet(HTML) 7 Page - Mitsubishi Electric Semiconductor |
7 / 16 page MITSUBISHI ICs (AV COMMON) M52393P/FP EDTV2 IDENTIFICATION SIGNAL DETECTOR 7 METHOD OF DETECTION A line part (refer to Fig.1) An EDTV2 ID is inserted into the line 22 (line 285), therefore the IC detects during 3lines (including before and after 2 lines of the line 22). A field contains the ID signal in its appropriate lines, whitch results in an EDTV2 signal. In a case the ID signal is detected a couple of times during three lines, a signal is regarded as a standard signal not an EDTV2 considering the correlation between 2 or 3 lines (pin 7 is grounded). On the other hand, the line correlation is off by opening the pin 7. In this case, the signal is regerded as an EDTV2 even though the ID signal is detected a couple of times during the three lines. A field part (refer to Fig.2) In a case the ID signal is detected in 8 consecutive fields, a signal is regarded as an EDTV2 one and the pin 9 outputs high. However it can not be detected consecutivelly, a signal is not an EDTV2 one and the pin 9 is low. Detecting timing is varied in following 2 modes. A field mode The pin 10 is opened (2.5V). The detection is performed once a field. It takes more than 133ms (4 frames) for the distinction. A frame mode The pin 10 is grounded (0V). The detection is performed once a frame; once a Odd field or once a Even field. It takes more than 267ms (8 frames) for the distinction. Note: The alternatvie of Odd or Even field is difficult because of no field distinction. |
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