Synchronization of inbound and outbound audio in a heterogeneous echo cancellation system
US9812146B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2016 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Feb 16, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An echo cancellation system that synchronizes output audio data with input audio data in a heterogeneous system. The system may increment a counter as outgoing audio frames are sent to a digital-to-analog converter in a speaker. As incoming audio frames are received by an analog-to-digital converter in a microphone, the system may copy contents of the counter into the incoming audio frames. Based on the contents of the counter, the incoming audio frames may be associated with corresponding outgoing audio frames. After synchronizing the incoming audio frames and the outgoing audio frames, the system may perform Acoustic Echo Cancellation by removing the outgoing audio frames from the incoming audio frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.