Title:
FUNDAMENTAL FREQUENCY EXTRACTION METHOD BASED ON DJ CONVERSION
Document Type and Number:
WIPO Patent Application WO/2021/137419
Kind Code:
A1
Abstract:
According to an embodiment of the present invention, a method of extracting a fundamental frequency of an input sound comprises the steps of: generating, for the input sound, a DJ conversion spectrogram indicating a frequency corresponding to a natural frequency of each of a plurality of springs and an estimated pure tone amplitude according to a plurality of time points by performing a DJ conversion for calculating the estimated pure tone amplitude by modeling vibrational motions of the plurality of springs having different natural frequencies; calculating, for each natural frequency of the DJ conversion spectrogram, a fundamental frequency fitness on the basis of a moving average of the estimated pure tone amplitude or a moving standard deviation of the estimated pure tone amplitude; and extracting the fundamental frequency on the basis of a maximum value of the fundamental frequency fitness according to the natural frequency for each time point.
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Inventors:
KIM DONG JIN (KR)
SHIN JU YONG (KR)
SHIN JU YONG (KR)
Application Number:
PCT/KR2020/015910
Publication Date:
July 08, 2021
Filing Date:
November 12, 2020
Export Citation:
Assignee:
BRAINSOFT INC (KR)
International Classes:
G10L21/0316; G10L25/15; G10L25/18
Foreign References:
| JP2010102129A | 2010-05-06 | |||
| JP2018072566A | 2018-05-10 | |||
| KR20010026290A | 2001-04-06 | |||
| JP2010078990A | 2010-04-08 | |||
| KR102164306B1 | 2020-10-12 |
Other References:
QUATIERI, THOMAS F.: "Discrete-Time Speech Signal Processing: Principles and Practice", 1 January 2002, PRENTICE HALL PTR, US, ISBN: 0-13-242942-X, article THOMAS F. QUATIERI: "4.3.2 Effect of Energy Loss", pages: 127 - 130, XP009528899
Attorney, Agent or Firm:
LEE, Joon Sung (KR)
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