| 摘要 |
PURPOSE:To allow a reception side to know that a transmission side approaches or reaches the reception side without generating any noise by regenerating synthetic sound sent from the transmission side by radio transmission on the reception side. CONSTITUTION:The movable transmitter 11 is mounted on an automobile 10 and the receiver 20 of the reception side is fixed on principle. A transmitted signal sent from the transmitter 11 on the automobile 10 is a discrimination signal and a radio wave obtained by modulating a digital signal is used as the discrimination signal. Namely, '001' is assigned as a discrimination code to the automobile 10. The transmitter 11 modulates the digital discrimination code and sends it by radio. The receiver 20 on the reception side which has a voice regenerating function by sound synthesis when receiving the transmitted signal by a receiving discrimination circuit 22 decodes the discrimination code and checks whether it has a specific pattern or not. When the discrimination code has the specific pattern, specific sound stored in the sound synthesizing circuit 21 previously is reproduced. In this case, a system which has automobiles having said transmitter can be considered naturally. |
