Spectral noise compensation for telecommunication signal processing
July 1, 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 ReferencesAdaptive sub-band echo suppressor Echo cancelling device with frequency sub-band filtering Subband echo canceler including real time allocation among the subbands Sub-band acoustic echo canceller Residual echo elimination with proportionate noise injection Subband echo canceller with adjustable coefficients using a series of step sizes Nonlinear processor for an echo canceller and method Echo canceller processing techniques and processing Noise elimination method Echo canceller using impulse response estimating method InventorAssigneeApplicationNo. 674324 filed on 07/01/1996US Classes:370/288, Using an attenuator370/290, Using a particular adaptive filter379/406.07, Using attenuator379/406.14Sub-band analysisExaminersPrimary: Hsu, Alpus H.Attorney, Agent or FirmInternational ClassesH04B 003/20H04M 009/08 AbstractA telecommunication signal processor includes a noise compensation system for preventing undesirable spectral modulation of the noise component of a telecommunication signal subjected to a process wherein subband portions of the signal are variably attenuated. A noise component is injected into each attenuated error signal in order to compensate for attenuation of background noise incidental to the variable attenuation of the subband signals. The amplitude of the noise components are each determined independently on the basis of an estimated noise content of the original subband signals and in accordance with the applied attenuation within each subband. The attenuated and noise-compensated subband signals are combined by a synthesis filter to provide a send-output signal. | |
