Process and device for creating comfort noise in a digital speech transmission system
Patent 5812965 Issued on September 22, 1998. Estimated Expiration Date: 
October 11, 2016. 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.
October 11, 2016. 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 ReferencesVoice activity detection Voice coding communication system and apparatus therefor Comfort noise generation for digital communication systems Voice coding communication system and apparatus Apparatus for noise removal during the silence periods in the discontinuous transmission of speech signals to a mobile unit Patent #: 5553192 InventorAssigneeApplicationNo. 731381 filed on 10/11/1996US Classes:704/205, Frequency704/228Post-transmissionExaminersPrimary: Hudspeth, DavidAssistant: Edouard, Patrick N. Attorney, Agent or FirmForeign Patent References
International ClassesG10L 003/02G10L 009/00 Foreign Application Priority Data1995-10-13 FRAbstractA process and a device for creating comfort noise for discontinuous speech transmission in which, following the end of each detected active period, a silence descriptor frame is generated as a set of parameters describing the comfort noise. For every successive current inactive frame, the frequency spectrum is analysed and then compared with a reference spectrum stored previously. Upon identity of the reference frequency spectrum and the current frame spectrum, no new silence descriptor frame is transmitted. Upon absence of identity of these spectra, a new silence descriptor frame is transmitted.Other References
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