Method and arrangement for noise cancellation in a speech encoder
US9082391B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2010 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | May 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02165
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method and arrangement for an improved noise canceller in a speech encoder. Sound signals are captured at a primary microphone in conjunction with a reference microphone. An adaptive shadow filter is adapted to the correlation between the signals captured at the primary and reference microphones. Further, a diffuse-noise-field detector is introduced which detects the presence of diffuse noise. When the diffuse-noise-field detector detects diffuse noise, the filter coefficients of the adapted shadow filter is used by a primary filter to cancel the diffuse noise at the signal captured by the primary microphone. Since the filter coefficients of the adapted shadow filter only is used for cancellation when diffuse noise is solely detected, cancellation of the speech signal is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.