INFRARED RAY AUDIO LINK IN MOBILE TELEPHONE

摘要

PROBLEM TO BE SOLVED: To transfer full duplex real time audio by the half duplex IR link of a low speed by using an appropriate system and switching the direction of a half duplex channel. SOLUTION: An IR link module 10 is provided with the combination of a plurality of functional blocks 11-15 and a medium driver as an IR block 16 and is provided with three link interfaces with it. The IR link module 10 is connected to the BB of a mobile telephone or the like through a BBIF and transmits signals from there through an MIF and an IRIF to the free space of the outside or a light guide. A multiplexer 13 is controlled by the state machine of a control block 12 and selects a bit correct number from FIFOs 14 and 15. At the high-speed bus mode, the multiplexer 13 specifies the route of a high-speed bus message so as to directly reach the IR block 16 from a high-speed data channel 19.