| 摘要 |
<p>PURPOSE:To prevent the generation of noise by inputting continuously the same no-voice digital signal as a digital signal outputted from a voice signal output device to a demodulating device when there is no voice signal present. CONSTITUTION:When the output of a digital voice signal output device 1 is started with a command signal from a command line 4, a switching device 6 connected the output of the digital voice output device 1 to the demodulating device 3 synchronously. When the output of the digital voice signal output device 1 is stopped with a command signal, the switching device 6 connects the output of a no-voice signal output device 5 to the demodulating device 3 synchronously. Therefore, there is no variation in the mean level of the digital signal inputted to the demodulating device 3 even at the time of the switching of the switching device 6, and noise mixing never occurs.</p> |
