Confidence layer
Confidence is not optional
A wellness trend output without signal confidence is dangerous product design. The user needs to know when a reading is meaningful and when motion or contact made it unreliable.
Quality features
Useful quality features include pulse SNR, peak prominence, spectral concentration, autocorrelation stability, cross-channel agreement, IMU energy, pressure stability, temperature context, and missing/invalid sample handling.
How it appears to users
SciFold should expose confidence states such as high, medium, low, or invalid. Do not hide uncertainty. A low-confidence suppression is more credible than a confident wrong alert.
SEO role
This page supports searches around PPG signal quality index, wearable PPG confidence, and contact detection. It also makes the wellness claims more defensible.