Adaptive noise cancellation system
Patent 6313738 Issued on November 6, 2001. Estimated Expiration Date: 
June 9, 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.
June 9, 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 ReferencesCoherent noise cancelling filter Efficient cancelling of AC line interference in electronic instrumentation Power line carrier data transmission systems having signal conditioning for the carrier data signal Adaptive line noise canceler and detector for ECG signals Patent #: 6041250 InventorApplicationNo. 871297 filed on 06/09/1997US Classes:375/297Power amplifierExaminersPrimary: Pope, DarylInternational ClassH04M 011/04AbstractA power line adaptive noise cancellation system receives noise signals from house power lines and adaptively cancels the received noise from a power line input signal. The system includes a power line input signal receiver, at least one power line noise signal receiver and an adaptive noise cancellation device. The input signal and the noise signals are bandpassed filtered and demodulated by a local oscillator to generate baseband signals for both the input signal as well as the noise signals. The noise signals are input into adaptive filters that filter the noise signal based on a set of adaptive weights. The output of the adaptive filters are subtracted from a delayed baseband input signal to generate a received input signal. The received input signal is also fed back to the adaptive filters for updating adaptive weights of the adaptive filters.Other References
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