| 摘要 |
PURPOSE:To transmit a chance phenomenon more exactly, by using a stable time zone immediately after a training signal has stopped. CONSTITUTION:An output waveform of the seismograph 1 is always watched by the amplitude selector 2, and in case the amplitude is not varied, the selector commands to send out a training signal to the modulator and demodulator 4, in case the amplitude has been varied, it is commanded to stop sending the training signal to the device 4, and it is commanded to perform the PCM transmission of the earthquake wave. After that, when the variation of the amplitude has been discontinued, the PCM transmission is stopped after a fixed time (t), and transmission of the training signal is reopened. |
