| 摘要 |
An electronic host device, such as a cellular telephone or music player, comprises an interface for connecting an accessory device, such as earphones and headsets, which are connected by a TRRS(4-pole) 3.5 mm jack plug and socket connector 10. The interface is switchable to selectively configure the connections of the TRRS connector either to convey unidirectional analogue signals between the host and an analogue accessory or to convey bidirectional digital signals between the host and a connected digital accessory and to carry power as required from the host to the accessory. The switching may either be triggered manually, or implemented automatically in response to electronic detection of the connection of a digital accessory device to the host device, and may utilise, for example, FET transistor switches or FET-based integrated switches. The accessory can be a headset with ambient noise cancelling or a digital signal processor. |
