Far field noise suppression for telephony devices
US8989815B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2012 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Feb 27, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Noise suppression systems and methods suppress far field noise in a microphone signal. A telephony system includes a main microphone and a reference microphone. In one example, the main microphone and the reference microphone can be located in the same device. In another example, the main microphone and the reference microphone can be located in two separate devices. A DSP can use the reference microphone signal to carry out suppression of far field noise in the main microphone signal. In one approach the DSP can determine an estimate of far field noise in the main microphone signal based on a noise estimate of the reference microphone signal and a reference and main microphone coupling estimate, and then subtract the far field noise estimate from the main microphone signal. Alternatively, the DSP can suppress the main microphone signal if it determines that a local talker is inactive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.