INTERPHONE SYSTEM

申请公布号：JPH1023170(A)

申请号：JP19960169429

申请日期：1996.06.28

申请公布日期：1998.01.23

申请人：

AIPHONE CO LTD

发明人：YASUI TOSHIMI

分类号：H04M19/08;H04M9/00

主分类号：H04M19/08

摘要：PROBLEM TO BE SOLVED: To use effectively a power supply voltage of an interphone where one of incoming and outgoing voice signals between the master set and a slave set is sent in a form of a current signal and the other is sent in a form of a voltage signal. SOLUTION: A voice signal given to an operational amplifier U1 of a voltage drive circuit 11 of the master set M is outputted to a transmission line 15 as a voltage signal via a current mirror circuit CM2 of a current detection circuit 14 and the signal is detected by an operational amplifier U2 provided to a voltage detection circuit 12 of a slave set B. A voice signal outputted from an operational amplifier U3 of a current drive circuit 13 of the slave set B is converted into a current signal by a current limit resistor R1 and the signal is outputted to the transmission line 15 via a current mirror circuit CM1 , the current mirror circuit CM2 of the master set M detects the current signal and the voice signal converted into a voltage signal is outputted by using the current mirror circuit CM3 and a load resistor R2 .

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