Adaptive Notch Filter with time-frequency tracking of continuously changing frequencies
We propose in this paper a novel modification of the popular Adaptive Notch Filter (ANF) to improve the tracking of time-varying frequencies. Unlike previous algorithms, our new method incorporates a modeling of frequency variation directly into the cost minimization procedure. Our results show a notable improvement in the frequency estimation performance over earlier methods, and comparisons over a few examples show the general effectiveness of our approach.