| 摘要 |
An accessory ( 102 ) for a portable communication device ( 104 ) includes audio input ports ( 134 ) for receiving a differential audio signal having a DC bias ( 114 ), a speaker ( 116 ) coupled to the audio input ports, and accessory electronics ( 124 ) powered by the DC bias. The use of the DC bias of the differential audio signal ( 114 ) as a power source enhances the power source capability of the accessory ( 102 ).
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