Abstract:
A Gocrtzcl based all digital phase locked loop for removing power line interference
from the ECG signal is proposed. A power line interference is artificially
iiitroduccd in ECG signal and this proposed scheme tracks the amplitude and
phase of all the interference components for power line frequency deviations from
input signal frequency (i.e. 50 Hz). The output sampling frequency is adjusted
with the help of all digital phase locked loop (ADPLL) to correct the phase errors
introduced by the SG filter whenever variations in frequency occur. Main
building blocks of proposed method are discussed. MATLAB simulation results
are discussed and future work is to make this scheme adaptive for large variation
in input frequency.
