Patent ID: 6611602
Filing Date: 2003-08-26
Classification: H03H

Abstract:
An article of manufacture comprising:(a) a recursive digital notch (IIR) filter constructed to receive an input signal and to produce an.output signal, the IIR notch center frequency being tunable in response to a function of the control signal recited below; (b) an adaptation filter constructed to eliminate signals of interest from the output signal of the IIR filter and to produce an output signal for adaptation; (c) a non-recursive digital notch (FIR) filter constructed to receive the output signal from the adaptation filter and to produce an FIR output signal, the FIR notch center frequency being tunable in response to the control signal recited below, and being the same as the IIR notch center frequency when the control signal is applied to the FIR filter and the function of the control signal is applied to the IIR filter; and (d) a control signal generator constructed to generate a control signal which adaptively minimizes the FIR output signal.