| 摘要 |
An audio interface (1) comprising a socket (3) arranged to receive a plug (30), the socket arranged to transfer an audio signal to the plug when connected to the socket, the interface comprising a detector (10) to determine whether an audio signal is received at the socket, the detector arranged to cause generation of a test signal to indicate that an audio signal is received at the socket, at least when the plug is not connected to the socket. |
