Adaptively reducing noise while limiting speech loss distortion
US9143857B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2013 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | Feb 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02087
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present technology provides adaptive noise reduction of an acoustic signal using a sophisticated level of control to balance the tradeoff between speech loss distortion and noise reduction. The energy level of a noise component in a sub-band signal of the acoustic signal is reduced based on an estimated signal-to-noise ratio of the sub-band signal, and further on an estimated threshold level of speech distortion in the sub-band signal. In various embodiments, the energy level of the noise component in the sub-band signal may be reduced to no less than a residual noise target level. Such a target level may be defined as a level at which the noise component ceases to be perceptible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.