| 摘要 |
A communication device has a socket 41 for connection to a plug 47 of an external acoustic transducer device 35, 37. The communication device includes a phone chip 101 for communicating with the external acoustic transducer device via the plug and socket. The phone chip 101 has an interface 39 electrically connected to the socket, and is enabled to detect an impendence between at least two contacts of the socket, and thereby determine if the socket is connected to the plug. Typically, this test is carried out at intervals, and when it is carried out according to the result of the determination, generates an interrupt signal that can modify how the phone chip 101 operates the interface 39.
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