M52393P データシートの表示（PDF） - Mitsumi

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M52393P

EDTV2 IDENTIFICATION SIGNAL DETECTOR

Mitsumi 

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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