| 摘要 |
PROBLEM TO BE SOLVED: To expensively provide a catch phone function in a slave machine where direct speech with other slave machines is possible by switching a sound processing means for connecting a sound input/output means from the sound processing means being currently connected to other sound processing means. SOLUTION: When a slave machine 101 speaks with another slave machine in inter-slave machine direct speech mode, sound processing of a radio channel which performs speech with another slave machine is performed at an A radio sound processing part 105a and the sound processing of a radio channel to be used with a third slave machine that receives an incoming call anew is performed at a B radio sound processing part 105b. Then, when the slave machine 101 receives a calling message from a third slave machine, a switch 106 is controlled so that the B radio sound processing part 105b performing the sound processing of the channel that the third slave machine uses is connected to a speaker 107 and a microphone 108. A hold sound source 113 is connected to the A radio sound processing part 105a. Thus, it is possible to speak with the third slave machine while holding a speech with another slave machine.
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