Heart rate measurement and a photoplethysmograph (PPG) heart rate monitor

A photoplethysmograph (PPG) heart rate monitor device comprising:

• a PPG sensor component configured to generate an analog PPG signal;
• an accelerometer configured to generate an X-axis acceleration signal, a Y-axis acceleration signal, and a Z-axis acceleration signal;
• a motion compensation component coupled to the PPG sensor to receive the PPG signal and coupled to the accelerometer to receive the X-axis acceleration signal, the Y-axis acceleration signal, and the Z-axis acceleration signal, wherein the motion compensation component is configured to generate a first motion compensated PPG signal with reference to the X-axis acceleration signal, a second motion compensated PPG signal with reference to the Y-axis acceleration signal, and a third motion compensated PPG signal with reference to the Z-axis acceleration signal;
• a combiner configured to combine the first motion compensated PPG signal, the second motion compensated PPG signal, and the third motion compensated PPG signal to generate a fourth motion compensated PPG signal, wherein a first weight is applied to the first motion compensated PPG, a second weight is applied to the second motion compensated PPG signal, and a third weight is applied to the third motion compensated PPG signal;
• and
• a Fourier Transform (FT) component configured to perform a single FT on the fourth motion compensated PPG signal to generate a frequency domain PPG signal for heart rate estimation.