Audio signal output device in which optical signals are not...

Details Audio signal output device in which optical signals are not... Audio signal output device in which optical signals are not...

2005-12-06

2005-12-06

Elamin, A. (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S323000, C713S324000, C385S056000, C385S079000

Reexamination Certificate

active

06973582

ABSTRACT:
An audio signal output device is disclosed in which optical signals are not output when a plug is not connected to an S/PDIF output terminal. When a plug is not connected to the S/PDIF output terminal, a fitting metal part does not contact a detection pin, and a connection detection signal is therefore 12V. As a result, a PNP transistor and an n-channel MOS transistor are both OFF, a power supply voltage of 5 V is not supplied to a drive IC, and optical signals are not output.

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