hrv_freq: reject welch segments with a mid-window gap - #72
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_welchBandPower only checked beat count per segment, not time span. a dropout in the middle of a ~67s HF window still clears 16 points if beats cluster at both ends, so lomb-scargle ran on it like a full segment and published bogus LF/HF/lf_hf/nu numbers at high confidence. resp_rate.dart's identical welch loop already guards this (span < segSec*0.8), ported the same check here.
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📝 WalkthroughWalkthroughChangesHRV segment validation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Gap-corrupted HRV segments can still contribute frequency-domain power despite the new validation, so the intended protection is incomplete and should be fixed before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Reviewer's GuideThe PR hardens HRV Welch spectral estimation by rejecting segments whose beat timestamps do not span at least 80% of the nominal window, preventing mid-recording dropouts from producing misleading high-tier frequency metrics. Tests cover both the corrupted-gap regression and a valid continuous control. Flow diagram for Welch segment validationflowchart TD
A["Welch segment beat timestamps"] --> B{"At least 16 beats and spans 80% of segSec?"}
B -->|No| C["Reject segment"]
B -->|Yes| D["Run lombScargle"]
D --> E["Compute band power"]
C --> F["Return null when no valid segments remain"]
E --> G["Publish HRV frequency metrics"]
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Inline comments:
In `@lib/src/onehz/clinical/hrv_freq.dart`:
- Line 237: Update the segment validation before lombScargle to reject segments
with excessive internal beat-time gaps, using the maximum adjacent timestamp
difference in addition to the existing point-count and endpoint-span checks.
Adjust the relevant fixture so beats remain on both sides of one HF segment’s
internal gap, and add coverage verifying that this segment is rejected.
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lib/src/onehz/clinical/hrv_freq.darttest/onehz/clinical_test.dart
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endpoint span (ts.last-ts.first < segSec*0.8) misses a dropout with beats surviving near both edges of the window - span looks fine, the middle is empty. guard the single largest inter-beat gap too (>20% of segSec), per coderabbit review on #72.
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_welchBandPower only checked beat count per segment (>=16), never time span. a ~40-50s gap in the middle of a ~67s HF window (off-wrist, BLE reconnect mid-drain) can still leave >=16 beats clustered at both ends, so the segment passes and lomb-scargle runs on it like it's continuous. LF/HF/VLF/ULF (and lf_hf/nu_lf/nu_hf/total downstream) get published at Tier.high off a periodogram that's really just a window function.
resp_rate.dart's rsaRespRate does the identical welch-on-beat-times segmentation and already guards this:
k < 30 || tSec[hi-1]-tSec[lo] < segSec*0.8. hrv_freq never got that fix. ported it over, same threshold, same reasoning comment.verified the regression by reverting the fix locally and rerunning the new test — old code returns hf=781.5 on a gap-corrupted segment, fixed code correctly returns null. full suite green otherwise (653 passed, 6 pre-existing fixture-skips unrelated to this change).
Summary by Sourcery
Reject gap-corrupted Welch segments before calculating HRV frequency-band power.
Bug Fixes:
Tests:
Summary by CodeRabbit
Bug Fixes
Tests