Noise estimation apparatus, noise estimation method, noise estimation program, and recording medium
US9754608B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2013 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Apr 10, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A noise estimation apparatus which estimates a non-stationary noise component on the basis of the likelihood maximization criterion is provided. The noise estimation apparatus obtains the variance of a noise signal that causes a large value to be obtained by weighted addition of the sums each of which is obtained by adding the product of the log likelihood of a model of an observed signal expressed by a Gaussian distribution in a speech segment and a speech posterior probability in each frame, and the product of the log likelihood of a model of an observed signal expressed by a Gaussian distribution in a non-speech segment and a non-speech posterior probability in each frame, by using complex spectra of a plurality of observed signals up to the current frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.