| http://www.w3.org/ns/prov#value | - where tp is the time from a specific detection point of the phase waveform signal 422, e.g., a vibration start time until a zero-crossing point after a peak (the time tp is obtained by generating a window signal 44 having a predetermined width from the signal 43 and by comparing the window signal 44 with the phase signal 422), ??p is the wavelength of an elastic wave, and n is an integer.
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