Fundamental Frequency Extraction Method Based on DJ Transform

摘要

A method of extracting a fundamental frequency of an input sound according to an embodiment of the present invention includes performing a DJ transformation for calculating the estimated pure tone amplitude by modeling the vibrational motions of a plurality of springs having different natural frequencies. Generating a DJ transform spectrogram indicating the estimated pure tone amplitude according to a frequency corresponding to a natural frequency of each of a plurality of springs and a plurality of viewpoints; Calculating a fundamental frequency fit based on a moving average of the estimated pure tone amplitude or a moving standard deviation of the estimated pure tone amplitude for each of the natural frequencies of the DJ transform spectrogram; And extracting a fundamental frequency based on a maximum value of the fundamental frequency fitness according to the natural frequency for each time point.