… Gradient-based adaptive IIR notch filtering for frequency estimation. IEEE Transactions on
… A stable and efficient adaptive notch filter for direct frequency estimation. IEEE Transactions …

… An adaptive notch filter is presented to analyze integral and fractional harmonics of variable
fundamental frequency. The algorithm is composed of a fundamental frequency estimator …

… key to estimate the phase … adaptive wiener filter can re⁃ duce noise jamming adaptively.
In this paper, the recursive least squares (RLS) algorithm combined with adaptive Notch filter is …