Patent ID: 6904443
Filing Date: 2005-06-07
Classification: H03H

Abstract:
1. A filtering system comprising: a first input that receives a signal contaminated with noise; a second input that receives a noise reference signal; a set of M notch filters, wherein each of the M notch filters is responsive to a corresponding tuning coefficient so as to attenuate a corresponding noise frequency in the signal contaminated with noise; a tuning parameter generator coupled to the second input, wherein the tuning parameter generator is arranged to generate a tuning parameter corresponding to a fundamental frequency of the noise based on the noise reference signal; a filter coefficient generator coupled to the tuning parameter generator and to each of the M notch filters, wherein the filter coefficient generator is responsive to the tuning parameter so as to provide each of the M notch filters with the corresponding tuning coefficient; and, a gain normalizer coupled to the M notch filters and to the first input, wherein the gain normalizer is arranged to adjust an overall gain of the M notch filters.