Invention Grant
- Patent Title: Echo reduction system
- Patent Title (中): 回波减速系统
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Application No.: US11788069Application Date: 2007-04-18
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Publication No.: US08111840B2Publication Date: 2012-02-07
- Inventor: Tim Haulick , Gerhard Uwe Schmidt , Martin Roessler
- Applicant: Tim Haulick , Gerhard Uwe Schmidt , Martin Roessler
- Applicant Address: US MA Burlington
- Assignee: Nuance Communications, Inc.
- Current Assignee: Nuance Communications, Inc.
- Current Assignee Address: US MA Burlington
- Agency: Sunstein Kann Murphy & Timbers LLP
- Priority: EP06009468 20060508
- Main IPC: H04B15/00
- IPC: H04B15/00 ; H04R3/00 ; H04R27/00 ; H04R25/00 ; G10L15/20

Abstract:
A system for reducing an echo and/or a residual echo in a microphone output signal includes an echo compensation filter configured to receive audio input signals and generate an estimated echo signal. A speech activity detector is configured to detect speech of a local speaker, and a combining circuit is configured to generate an echo compensated signal by subtracting the estimated echo signal from the microphone output signal. A residual echo reduction circuit is configured to suppress the residual echo in the echo compensated signal based on the detected speech activity, and output an echo suppressed output signal. The echo reduction system may reduce local background noise and residual echoes in a microphone output signal so that local speech may be transmitted free from undesirable signals.
Public/Granted literature
- US20080031467A1 Echo reduction system Public/Granted day:2008-02-07
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