Patent ID: 8781819
Filing Date: 2014-07-15
Classification: G10L

Abstract:
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.