Noise suppression device
US7788093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2007 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | Jul 21, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A noise reduction device including: an input signal spectrum obtaining unit that obtains an input signal spectrum by a subband unit based on a current frame of an input signal; an averaged spectrum obtaining unit that obtains an averaged spectrum of the input signal by averaging the input signal spectrum; an estimated noise spectrum obtaining unit that obtains an estimated noise spectrum estimated based on a past frame of the input signal by the subband unit; and an SN ratio obtaining unit that obtains an SN ratio by the subband unit, based on the averaged spectrum of the input signal obtained by the averaged spectrum obtaining unit, the estimated noise spectrum obtained by the estimated noise spectrum obtaining unit, and a function of the averaged spectrum of the input signal obtained by the averaged spectrum obtaining unit and the estimated noise spectrum obtained by the estimated noise spectrum obtaining unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.