| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system having a plurality of instruction tables 1a and 1b and one or more mobile station devices 4a to 4d for making the instruction table receive and output a voice from the mobile station device and a voice from the other instruction table 1b or 1a by making it easy for a person who listens to those voices to discriminate them. SOLUTION: This communication system is provided with a first transmission means for transmitting a signal to be transmitted from an instruction table to a mobile station device, a second transmitting means for transmitting a signal transmitted from the instruction table to be transmitted by the first transmitting means to the other instruction table, a third transmitting means for transmitting a signal to be transmitted from the mobile station device to the instruction table and a signal level control means 2 for controlling the level of the signal to be transmitted from the instruction table to the other instruction table by the second transmitting means so as to be smaller than the level of the signal to be transmitted from the mobile station to the other instruction table by the third transmitting means. COPYRIGHT: (C)2007,JPO&INPIT
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