M52393FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
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M52393FP Datasheet PDF : 16 Pages
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MITSUBISHI ICs (AV COMMON)
M52393P/FP
EDTV2 IDENTIFICATION SIGNAL DETECTOR
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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