Filter bank frequency multiplication based on bci signal for suppressing heart rate calculation method, device, equipment and medium

CN122440176APending Publication Date: 2026-07-24SHENZHEN QUANTUM WISDOM TECH CO LTD
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Patent Information

Application Number
CN202610922859.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing BCG heart rate calculation methods are easily affected by changes in the mattress medium transfer function, body position, breathing interference, and waveform bimodality in mattress-based sensing scenarios. This leads to a weakening of the fundamental frequency component and an enhancement of the harmonic component, causing the heart rate algorithm to easily lock at the 2nd or 3rd harmonic frequency, resulting in continuous harmonic misjudgment and affecting the stability and reliability of sleep monitoring.

Method used

A filter bank frequency doubling suppression method is adopted. BCG signals are acquired through a multi-channel piezoelectric thin film sensor, and body motion indexes are calculated after windowing processing. Channel quality scoring and weighted fusion are performed. Candidate heart rates are generated using peak spacing, autocorrelation, and frequency domain spectral peak method. Harmonic consistency discrimination and frequency doubling back-off processing are performed. Combined with continuity constraints, a multi-level verification closed loop is formed to identify and correct frequency doubling misjudgments caused by harmonic energy dominance.

Benefits of technology

It effectively identifies and corrects misjudgments of harmonic frequencies caused by the dominance of harmonic energy, improves the accuracy and stability of heart rate calculation, adapts to signal processing under different sleeping positions, ensures the continuity and physiological rationality of the heart rate curve, and is particularly suitable for long-term operation of nighttime sleep monitoring.

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Abstract

The application discloses a filter bank frequency multiplication suppression heart rate calculation method and device based on a BCG signal, equipment and a medium, and the method comprises the following steps: collecting a multi-channel BCG signal and performing window processing; calculating a body movement index based on a BCG voltage amplitude or an energy mutation, and marking a low-confidence window; performing channel quality scoring on a non-low-confidence window, and obtaining a reference BCG signal through weighted fusion; decomposing the reference BCG signal to obtain a plurality of sub-band BCG signals; generating a candidate heart rate and a confidence on each sub-band by combining a peak spacing method, an autocorrelation method and a frequency domain spectrum peak method; after clustering the candidate heart rate, weighting and correcting the candidate cluster score according to the sub-band source; performing harmonic consistency discrimination, when the frequency multiplication candidate is dominant and the fundamental frequency candidate has more than a threshold of supporting evidence in the low-frequency sub-band, performing frequency multiplication back-off adjustment scoring; combining the last window output to perform continuity constraint and suppress frequency multiplication jump. The application can actively identify and correct the frequency multiplication misjudgment caused by the harmonic energy being dominant.
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