| 摘要 |
PURPOSE:To confirm at the transmission side whether a receiver is operated in accordance with the instruction of a trnsimitter or not, by monitoring the operating state of the receiver at the transmitter side. CONSTITUTION:A sound wave irradiated from the receiver 2 is received on a sound sensor 1e such as a microphone provided to the transmitter 1. The sound is amplified selectively with a sensor amplifier 1m and only the signal component representing the operating state is outputted to a control circuit 1k. The circuit 1k obtains a signal representing the operating state by such as decoding the signal from the amplifier 1m, and this signal is compared with a control signal from a control operating section. The circuit 1k discriminates depending on the result of comparison whether the receiver 2 is operated in accordance with instruction of the control signal or not, and displays the result. |
