| 摘要 |
<p>PURPOSE:To reduce wrong information, by combining an acceleration amplitude discriminator circuit and a speed amplitude discriminator circuit to transmit an alarm output from an AND circuit. CONSTITUTION:When an earthquake occurs, vibration of the ground is converted with an accelerometer 1 into an electrical signal proportional to acceleration to be outputted to an amplification circuit 2. An output of the circuit 2 is branched in two and one system thereof is inputted into an acceleration amplitude discriminator circuit 3 as acceleration signal while the other is inputted into an integration circuit 4. The circuit 4 converts the acceleration signal into a speed signal to be inputted into a speed amplitude discriminator circuit 5. Both the acceleration and speed signals are compared in magnitude with voltages corresponding to the acceleration and speed preset with the circuits 3 and 5 and when they are above a set value, an output is provided to an AND circuit 6. When outputs of the circuits 3 and 5 are produced to the circuit 6 simultaneously, an alarm output is transmitted thereby reducing wrong information.</p> |
