Post filter for spectral domain echo cancellers to handle non-linear echo components
US8620232B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2012 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Oct 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present document discloses a method and system for improving echo cancellation in the presence of non-linear distortions. A circuit attenuates a transmit signal in one or more spectral bands based on a receive signal. The distorted echo comprised within the transmit signal results from distortions incurred by the receive signal when being rendered by an electronic device. The circuit compares energy values of the receive signal in multiple spectral bands with multiple corresponding spectral band dependent distortion thresholds and determines that for a first spectral band from multiple spectral bands. A first energy value from multiple energy values exceeding a first distortion threshold from multiple distortion thresholds attenuates the transmit signal in one or more spectral bands at higher frequencies than the first spectral band with corresponding spectral band dependent attenuation factors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.