Separating multiple audio signals recorded as a single mixed signal
US7454333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2004 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Dec 26, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0272
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method according to the invention separates multiple audio signals recorded as a mixed signal via a single channel. The mixed signal is A/D converted and sampled. A sliding window is applied to the samples to obtain frames. The logarithms of the power spectra of the frames are determined. From the spectra, the a posteriori probabilities of pairs of spectra are determined. The probabilities are used to obtain Fourier spectra for each individual signal in each frame. The invention provides a minimum-mean-squared error metho or a soft mask method for making this determination. The Fourier spectra are inverted to obtain corresponding signals, which are concatenated to recover the individual signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.