Music detector for echo cancellation and noise reduction
US8126706B2 · kind B2 · utility
11Cited by
11References
8Claims
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Key dates
| Filing date | Dec 9, 2005 |
| Grant date | Feb 28, 2012 |
| Priority date | — |
| Expiry date | Aug 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An audio signal is divided among exponentially related subband filters. The spectral flatness measure in each subband signal is determined and the measures are weighted and combined. The sum is compared with a threshold to determine the presence of music or noise. If music is detected, the noise estimation process in the noise reduction circuitry is turned off to avoid distorting the signal. If music is detected, residual echo suppression circuitry is also turned off to avoid inserting comfort noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.