Patent ID: 6741707
Filing Date: 2004-05-25
Classification: G10K

Abstract:
A method of tuning an adaptive feedforward noise cancellation algorithm, comprising the acts of: providing a feedforward LMS tuning algorithm including at least first and second time varying parameters wherein said feedforward LMS tuning algorithm includes the formulas:yk=WkTXk ; and Wk+1=&lgr;kWk+&mgr;kXkek adjusting said at least first and second time varying parameters as a function of instantaneous measured acoustic noise, a weight vector length and measurement noise variance, wherein said time varying parameters include: Î¼k=Î¼o&it;Î»k(Xk+Qk)T&it;(Xk+Qk)Î»k=(Xk+Qk)T&it;(Xk+Qk)-2&it;L&it;â€ƒ&it;Ïƒq2(Xk+Qk)T&it;(Xk+Qk)wherein Xk=Xk+Qk is a measured reference signal; Qk is measurement noise, including electronic noise and quantization noise;&sgr;q2 is the known or measured variance of the measurement noise; L is the length of the LMS weight vector Wk ek is the error signal.