Echo presence determination in voice conversations
US8385558B2 · kind B2 · utility
3Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2009 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Dec 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Presence of echo in a conversation is determined through a search performed in the sub-band domain using independent short length adaptive filters across a range of sub-band and maximum expected echo delay values. The adaptive filters attempt to predict and cancel the echo in the microphone signal based on the content in the speaker signal. If substantial cancellation is achieved in any of the sub-band filters, echo presence in the microphone signal is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.