Multi-channel ballistocardiography with cepstrum smoothing and quality-based dynamic channel selection

A ballistocardiography (BCG) system for heart beat determination comprising:

• a plurality of BCG sensors for generating a corresponding plurality of BCG signals in response to a subject's movement at a location of each of the plurality of BCG sensors;
• a BCG analyzer for determining a heart rate of the subject in response to the plurality of BCG signals;
• and
• a plurality of communication channels coupled to each of the plurality of BCG sensors and the BCG analyzer for providing the plurality of BCG signals from each of the plurality of BCG sensors to the BCG analyzer, wherein the BCG analyzer is configured to determine the heart rate of the subject by:
• digitizing the plurality of BCG signals;
• estimating a plurality of smoothed cepstra corresponding to each of the plurality of digitized BCG signals in response to a smoothed cepstrum analysis of a digital signal magnitude at a reception time of each of the plurality of digitized BCG signals;
• estimating a fused cepstrum for the plurality of digitized BCG signals in response to the plurality of smoothed cepstra;
• and
• determining the heart rate of the subject in response to the plurality of smoothed cepstra and the fused cepstrum.