Invention Grant
- Patent Title: Method and apparatus for echo cancellation
- Patent Title (中): 用于回波消除的方法和装置
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Application No.: US11609526Application Date: 2006-12-12
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Publication No.: US08014516B2Publication Date: 2011-09-06
- Inventor: Wei-hao Hsu , Hsi-Wen Nien
- Applicant: Wei-hao Hsu , Hsi-Wen Nien
- Applicant Address: TW Hsin-Chu
- Assignee: Mediatek Inc.
- Current Assignee: Mediatek Inc.
- Current Assignee Address: TW Hsin-Chu
- Agency: Thomas|Kayden
- Main IPC: H04M9/08
- IPC: H04M9/08

Abstract:
An exemplary embodiment of an echo cancellation circuit is provided, for use in a voice interaction device simultaneously outputting a remote signal while receiving a local signal. The local signal may comprise an echo generated from the remote signal. A first filter learns the remote signal at a first speed to generate a first coefficient set, and filters the local signal by the first coefficient set to generate a first filter output. A second filter learns the remote signal at a second speed to generate a second coefficient set, and filters the local signal by the second coefficient set to generate a second filter output. A third filter comprises a third coefficient set, canceling the echo from the local signal to generate a third filter output as an echo cancellation result. The controller updates the third coefficient set based on the first, second and third filter outputs.
Public/Granted literature
- US20070189506A1 METHOD AND APPARATUS FOR ECHO CANCELLATION Public/Granted day:2007-08-16
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