Texas Instruments Incorporated
Heart rate measurement and a photoplethysmograph (PPG) heart rate monitor

Abstract:

A method for heart rate measurement in a photoplethysmograph (PPG) heart rate monitor device is provided that includes performing motion compensation on a PPG signal wherein a motion compensated PPG signal PPG.sub.accX is generated with reference to an X-axis acceleration signal, a motion compensated PPG signal PPG.sub.accY is generated with reference to a Y-axis acceleration signal, and a motion compensated PPG signal PPG.sub.accZ is generated with reference to a Z-axis acceleration signal, combining PPG.sub.accX, PPG.sub.accY, and PPG.sub.accZ to generate a final motion compensated PPG signal, wherein a first weight is applied PPG.sub.accX, a second weight is applied to PPG.sub.accY, and a third weight is applied to PPG.sub.accZ, performing a single Fourier Transform (FT) on the final motion compensated PPG signal to generate a frequency domain PPG signal; and estimating a heart rate based on the frequency domain PPG signal.