Summary

This article surveys digital envelope detection methods for amplitude-fluctuating sinusoids, consolidating disparate tutorial material into a single practical reference. Readers learn how common detectors work, their performance tradeoffs, and implementation pitfalls across communications, audio, and radar contexts.

Key Takeaways

• Compare common envelope detectors (rectifier+LPF, analytic signal/Hilbert, synchronous detection, peak trackers, Teager energy) and their pros/cons.
• Design lowpass smoothing filters with attention to cutoff, ripple, and group delay to preserve envelope fidelity.
• Evaluate noise, sampling, and aliasing effects to choose an appropriate detector for given SNR and bandwidth constraints.
• Implement practical fixes (e.g., quadrature demodulation, baseline correction, or adaptive smoothing) to reduce distortion and bias.

Who Should Read This

Intermediate DSP engineers and practitioners (signal processing, audio, radar, and communications engineers) who need practical guidance on selecting and implementing digital envelope detectors.

TimelessIntermediate

Topics