Periodic signal processing method, periodic signal conversion method, periodic signal processing device, and periodic signal analysis method

摘要

The invention relates to a periodic signal processing method, a periodic signal conversion method, and a periodic signal processing device capable of reducing the influence of periodicity without using a spectral model. Time windows are arranged such that a center of each of the time windows is at a division position which divides a fundamental frequency in a temporal direction into fractions 1/n (where n is an integer equal to or larger than 2) so as to extract a plurality of portions of different ranges from a signal having periodicity. A power spectrum for the plurality of portions extracted by the respective time windows is calculated, and the calculated power spectrum is added with a same ratio.

主权项

1. A periodic signal processing method comprising:
extracting, from a signal having periodicity, a fundamental period of the signal in a temporal direction; arranging n sets of time windows such that centers of each of the n sets of time windows are separated by a fraction 1/n of the fundamental period, where n is an integer equal to or larger than 2, so as to extract n sets of portions of different ranges from the signal having periodicity; calculating n set of power spectrums for the n set of portions extracted by the respective time windows; adding the whole n sets of power spectrums with a same ratio to obtain a first power spectrum, calculating a second power spectrum by convolving a rectangular smoothing function having a width corresponding to a fundamental frequency in a frequency direction on the obtained first power spectrum, wherein the extracting fundamental period, the arranging time windows, the calculating power spectrums, and the adding at least two of the calculated power spectrums are performed by a processor programmed to perform the extracting fundamental period, the arranging time windows, the calculating power spectrums, and the adding at least two of the calculated power spectrums.