| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wireless system for an out-of-machine operator by using the general purpose radio of a press-to-talk system even if it is ICS adopting a side tone function without altering the ICS already loaded to an airplane. SOLUTION: This wire/wireless connection adapter device 20 is connected between machine body side radio 12 for performing transmission and reception with portable radio 13 and the ICS 2 provided with the side tone function, received voice signals RXAF 51 from the machine body side radio 12 are detected and relay switches 22 and 23 are driven by a relay driving part 21. When call termination signals are detected by the relay driving part 21, a first relay switch 22 is switched so as to send out the RXAF 51 to the ICS 2 and a second relay switch 23 is switched so as to prevent the sneak path of TXAF 61 to a VOX circuit 11. Thus, an oscillation state by the side tone function is prevented and communication is normally performed.</p> |
