Summary

This blog presents a compact, efficient digital filtering approach to remove 60 Hz powerline interference and baseline wander from ECG recordings. The author explains filter structures, design trade-offs, and implementation tips that help engineers achieve low-distortion, real-time ECG preprocessing.

Key Takeaways

• Design a narrow, high-Q notch (or equivalent IIR/FIR) to suppress 60 Hz mains while preserving ECG morphology
• Combine notch filtering with a low-cut (high-pass) stage or baseline-wander removal to eliminate slow drift
• Implement zero-phase or bidirectional filtering strategies to avoid waveform distortion when needed
• Use FFT/Spectral Analysis to identify residual harmonics and validate filter performance on real ECG traces
• Optimize filter coefficients and use fixed-point considerations for real-time embedded deployment

Who Should Read This

Intermediate DSP engineers, biomedical signal analysts, and embedded developers who need practical, low-cost methods to remove mains interference and baseline drift from ECG signals.

Still RelevantIntermediate

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