A study on cascaded adaptive notch filter utilizing allpass filter and adaptive line enhancer

Abstract

A cascaded second order adaptive notch filter using an allpass filter has been proposed. A gradient based algorithm for the adaptive notch filters are used. However, the performance of the adaptive notch filter is decreased due to disturbance which inputs into a tap input signal. In this paper, in order to solve the problem, an adaptive line enhancer which reduces the disturbance in a reference signal is introduced to the adaptive notch filter. Finally, computer simulation results are presented to confirm the convergence characteristics.

A Noise‐Free Adaptive Transversal Notch Filter Using the SSCF Algorithm with Decorrelation Parameter

“…For this type of adaptive notch filter, it has been shown that the convergence value of the adaptive parameter (tap gain) is unaffected (no bias difference) by the broadband signal when the broadband signal present in the background of a sinusoidal signal is white . Recently, an IIR adaptive notch filter without bias noise when the broadband signal is white has been proposed . However, stability problems peculiar to the IIR configuration and also the problem of how to determine the order are inevitable.…”