Patent ID: 8565443
Filing Date: 2013-10-22
Classification: G10K

Abstract:
1. An active noise cancellation system for reducing, at a listening position, power of a noise signal radiated from a noise source to the listening position, the system comprising: an adaptive filter that receives a reference signal representing the noise signal and provides a compensation signal; at least one acoustic actuator that receives the compensation signal and radiates an audio compensation signal indicative of the compensation signal to the listening position; a signal processing device that evaluates and assesses the stability of the adaptive filter; an LMS adaptation unit to adjust filter characteristics of the adaptive filter using a least mean square algorithm, where the LMS algorithm has a step-size parameter and a leakage parameter; a microphone disposed at the listening position, where the microphone senses and provides a residual error signal; a filter connected downstream to the adaptive filter to provide an estimation of the compensation signal at the listening position; a subtractor that subtracts the estimated compensation signal at the listening position from the error signal and provides an estimated noise signal at the listening position; and a decider unit that receives signals indicative of the error signal, the estimated compensation signal at the listening position, and the estimated noise signal at the listening position and assesses the stability of the adaptive filter and provides a stability signal indicative thereof.