In this paper, a new class of gradient-based algorithm by using variable step-size technique for a second-order adaptive IIR notch filter is presented. An adaptation step-size parameter for the algorithm is worked by the output signal and the gradient signal. The adaptive algorithm is used to detection of a sinusoid with additive white Gaussian noise, impulse noise and cancel 50-Hz interference in the recording of electrocardiograms signal. The performance of this algorithm proved here that gives high convergence speed, high impulse noise robustness and good efficiency of cancellation 50-Hz. Finally, the results of computer simulation are given to demonstrate the performance of the proposed algorithm for adaptive IIR notch filter.
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