# Blockwise PPG Enhancement Based on Time-Variant Zero-Phase Harmonic Notch Filtering

> Research article (Sensors, 2017) · cited 25× · AI/ML

**Wikidata**: [openalex:W2605658818](https://www.wikidata.org/wiki/openalex:W2605658818)  
**Source**: https://4ort.xyz/entity/blockwise-ppg-enhancement-based-on-time-variant-zero-phase-harmonic-notch-filtering