Residual echo suppression
Patent 5937060 Issued on August 10, 1999. Estimated Expiration Date: 
February 7, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 7, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesResidual echo elimination with proportionate noise injection Echo canceller with improved doubletalk detection Method and apparatus for detecting a near-end speech signal Patent #: 5633936 InventorAssigneeApplicationNo. 797801 filed on 02/07/1997US Classes:379/406.14, Sub-band analysis370/286, Echo suppression or cancellation379/406.05, Residual echo cancellation379/406.08, Adaptive filtering381/94.3In multiple frequency bandsExaminersPrimary: Le, N.Assistant: Hsieh, Shih-Yung Attorney, Agent or FirmInternational ClassesH04M 001/00H04M 009/08 H04B 015/00 AbstractA residual echo suppression system suppresses the remaining echo signal not cancelled by an echo canceller. The residual echo suppression system replaces the remaining echo signal by reshaping the spectrum of the signal so that the spectrum shape matches the background noise spectrum. The resultant system is useful in hands-free telephones and especially in hands-free cellular telephones for use in automobiles. | |
