| 摘要 |
PURPOSE:To improve reliability for reception, by informing the fact that reception information is information addressed to its own party when the frequency of an input signal coincides with the frequency set in advance. CONSTITUTION:An individual selection call signal outputted from the speaker 7a of a receiver 7 is inputted from a microphone 18a to an individual selection receiver 18, And when the frequency of the individual selection call signal coincides with the frequency set in advance, the receiver 18 drives an information means, and the fact that a voice signal outputted from the speaker 7a of the receiver 7 is the information addressed to its own party is informed. Since the individual selection call signal is inputted from the receiver 7 to the receiver 18 as a sound wave, no mutual connection via a signal line is required. Thereby, no problem such as imperfect connection, etc., exists, and the reliability for the reception can be improved. |
