| 摘要 |
<p>PURPOSE:To convert vibration data caused by an earthquake to a phase modulation and to send it out by connecting a surface acoustic wave delaying circuit having such a characteristic as a delay time is varied by vibration, in series to a path of a clock signal of a reproducing repeater having a 3R function. CONSTITUTION:One output terminal of an equalizing and amplifying circuit (EQL) 1 is connected to one of input terminals of a discriminating and reproducing circuit (DEC) 4, and the other output terminal is connected to an input terminal of a timing extracting circuit (TIM). An output terminal of the TIM 2 is connected to a surface acoustic wave delaying circuit (SAWD) 3 having such a characteristic as a delay time is varied by vibration. An output terminal of the SAWD 3 is connected to the other input terminal of the DEC 4. A signal amplified by the EQL 1 is inputted to the DEC 4 through the TIM 2, etc., and becomes a discriminating and reproducing clock of an output signal from the EQL 1. When an earthquake is generated, a reproducing repeater vibrates, a phase modulation is performed to a clock signal, the phase modulation of the clock signal is superposed to a reproducing output signal by the DEC 4, and the vibration of the reproducing repeater is converted to the phase modulation is sent out.</p> |
