Fundamental frequency extraction method using DJ transform
US11574646B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2020 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Nov 12, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of extracting a fundamental frequency of an input sound includes generating a DJ transform spectrogram indicating estimated pure-tone amplitudes for respective natural frequencies of a plurality of springs and a plurality of time points by calculating the estimated pure-tone amplitudes for the respective natural frequencies by modeling an oscillation motion of the plurality of springs having different natural frequencies with respect to an input sound, calculating degrees of fundamental frequency suitability based on a moving average of the estimated pure-tone amplitudes or on a moving standard deviation of the estimated pure-tone amplitudes with respect to each natural frequency of the DJ transform spectrogram, and extracting a fundamental frequency based on local maximum values of the degrees of fundamental frequency suitability for the respective natural frequencies at each of the plurality of time points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.