Interface circuit and main device
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United States of America Patent
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May 6, 2014
Grant Date -
Oct 24, 2013
app pub date -
Sep 2, 2011
filing date -
Jan 14, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is provided an interface circuit according to which a telephone or an intercom may be connected to a port of a main device including a telephone exchange function. The interface circuit includes a power supply circuit that supplies necessary power supply voltage according to the telephone or the intercom connected to the port, and a state detection circuit that detects, in a case where the telephone is connected to the port, whether the telephone is in an on-hook state or in an off-hook state, based on the value of an input impedance of the telephone, and that detects, in a case where the intercom is connected to the port, whether the intercom is in a standby state or in an activation button pressed state, based on a value of the input impedance of the intercom.
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