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vital-sign-extraction

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Estimate heart rate (HR) and breathing rate (BR) in bpm from a cleaned 1-D physiological time series such as radar phase, WiFi CSI amplitude, PPG, or a chest-motion signal. Use when Claude needs to choose HR/BR bandpass edges, pick a peak frequency from a noisy band, reject the HR second harmonic that often dominates the fundamental, handle respiration-harmonic leakage into the HR band on slow breathers, or flag low-confidence estimates. Not for arrhythmia / beat-to-beat analysis, multi-subject source separation, or rapidly non-stationary rates.

tasks/radar-vital-signs/environment/skills/vital-sign-extraction/SKILL.md

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Network or broad shell
Last checked
Nov 9, 2026

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Repository last updated
Nov 4, 2026
License
Apache-2.0

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# Vital-Sign Extraction

Given a cleaned 1-D periodic signal (radar phase, WiFi CSI, PPG, piezo), estimate heart rate and breathing rate in bpm.

Upstream ingestion of radar captures is the `radar-signal-processing` skill. This skill picks up after a 1-D signal is extracted.

## Pipeline (do every step)

1. **Split into BR and HR bands** with two separate bandpasses:
   - BR: `butter(4, [0.08, 0.5], btype='band', fs=fs)` — 4.8–30 bpm
   - HR: `butter(4, [0.7, 3.0], btype='band', fs=fs)` — 42–180 bpm
2. **Peak frequency via zero-padded Welch PSD:**
   ```python
   nperseg = min(len(x), int(fs * 25))
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