Vibration detecting system, signal processing apparatus and signal processing method

A vibration detection system, comprising:

• a seismic source device that generates a vibration wave repeated with a prescribed period by rotating an eccentric weight;
• a vibration receiving device that receives response waves due to the vibration wave transmitted via the ground;
• and
• a signal processing apparatus that processes vibration signals according to the response waves received by the vibration receiving device, wherein the signal processing apparatus including:
• a storage including a memory that stores vibration signals received by the vibration receiving device while the seismic source device is generating the vibration wave, the vibration signals containing a signal based on (i) the vibration wave and (ii) a signal based on microseism or an natural earthquake;
• a separating part that separates individual periodic signals having a period according to a periodicity of the vibration wave generated by the seismic source device from the stored vibration signals;
• a calculating part that calculates a standard periodic signal from the separated individual periodic signals;
• and
• a generating part that generates differential signals indicating the difference between the vibration signals received by the vibration receiving device and the standard periodic signal, the differential signal corresponding to a signal based on the microseism or the natural earthquake,
• wherein
• the storage stores the standard periodic signal calculated by the calculating part in association with an environmental condition, and
• the generating part generates the differential signals on the basis of the standard periodic signal that is associated with an environmental condition at the time when the vibration receiving device received the vibration signals.

A vibration detection system, comprising:

• a seismic source device that generates a vibration wave repeated with a prescribed period by rotating an eccentric weight;
• a vibration receiving device that receives response waves due to the vibration wave transmitted via the ground;
• and
• a signal processing apparatus that processes vibration signals according to the response waves received by the vibration receiving device, wherein the signal processing apparatus including:
• a storage including a memory that stores vibration signals received by the vibration receiving device while the seismic source device is generating the vibration wave, the vibration signals containing a signal based on (i) the vibration wave and (ii) a signal based on microseism or an natural earthquake;
• a separating part that separates individual periodic signals having a period according to a periodicity of the vibration wave generated by the seismic source device from the stored vibration signals;
• a calculating part that calculates a standard periodic signal from the separated individual periodic signals;
• and
• a generating part that generates differential signals indicating the difference between the vibration signals received by the vibration receiving device and the standard periodic signal, the differential signal corresponding to a signal based on the microseism or the natural earthquake,
• wherein
• the seismic source device is a seismic source device that generates vibration waves including a horizontal vibration and a vertical vibration, generates the first vibration wave corresponding to the vibration signal with the first polarity in the first period, and generates the second vibration wave corresponding to the vibration signal with the second polarity that has an inverse polarity of the first polarity in the horizontal direction or the vertical direction in the second period whose length is the same as the length of the first period.