| 摘要 |
PURPOSE:To ensure the steady continuation of the communication with no discontinuation regardless of the weak electric field or the high noise by switching the communication means between the aural signal and the code signal in accordance with the circuit level or the noise level. CONSTITUTION:In case the reception of the aural signals becomes impossible at station B due to reduction of the circuit level or mixture of the noise between stations A and B when the communication is given between the both stations, the keyboard 15b is operated at side B to transmit the reception unable signals. These signals are converted into the code signals through encoder 14b and then transmitted to side A through antenna 16b and via transmission part 11b. While at station A, the code signals are received from station B for display 21a to know the incapability of reception at station B. And thus keyboard 15a is operated to convert the output signals into the code signals through encoder 14a to be transmitted to side B through transmission part 11a. In such way, the communication means is switched between the aural signal and the code signal in accordance with the circuit level or the noise level, thus securing the steady continuation of the communication with no discontinuation. |
