| 摘要 |
PURPOSE:To suppress an unnecessary carrier signal and also to transmit a voice signal without interruption by outputting the carrier signal when the voice signal is outputted and no control signal is outputted. CONSTITUTION:When the control signal is outputted from a microcomputer 5, and when talking is started by depressing a talking switch 8, an output of a voice detection circuit 10 goes to H. The voice signal is superimposed on a modulation signal and the result is transmitted. When the microcomputer 5 completes the talking processing, a processing end signal goes to H and an output of a gate circuit 20 goes to H. Then a carrier signal is outputted from the gate circuit 21 and the voice signal is superimposed on the output of the gate circuit 21 and the result is transmitted. When the voice signal is lost while the processing end signal is at H level, the carrier signal from the gate circuit 21 is not outputted. As a result, the unnecessary signal is suppressed and the voice signal is transmitted without interruption. |
