Apparatus, method and computer program product for feature extraction
US8073686B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2009 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | May 30, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A feature extraction apparatus includes a spectrum calculating unit that calculates, based on an input speech signal, a frequency spectrum having frequency components obtained at regular intervals on a logarithmic frequency scale for each of frames that are defined by regular time intervals, and thereby generates a time series of the frequency spectrum; a cross-correlation coefficients calculating unit that calculates, for each target frame of the frames, a cross-correlation coefficients between frequency spectra calculated for two different frames that are in vicinity of the target frame and a predetermined frame width apart from each other; and a shift amount predicting unit that predicts a shift amount of the frequency spectra on the logarithmic frequency scale with respect to the predetermined frame width by use of the cross-correlation coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.