Heart rate monitoring method and apparatus

An electronic device, comprising:

• a processor;
• and
• a memory coupled to the processor, the memory storing a computer program that, when executed by the processor, causes the electronic device to perform operations including:
• determining that a wearer of the electronic device is a living body;
• obtaining a first photoplethysmograph (PPG) signal;
• determining a first heart rate and a confidence of the first heart rate according to the first PPG signal, wherein the confidence of the first heart rate is determined based on weight coefficients of M harmonic signals, wherein the M harmonic signals are determined according to the first PPG signal within a preset time, and M is an integer greater than or equal to 2, the determining the first heart rate and the confidence of the first heart rate comprising:
• performing smoothing processing on the first PPG signal to obtain a smoothed PPG signal after the smoothing processing,
• performing band-pass filtering on the smoothed PPG signal after the smoothing processing to obtain a second PPG signal, wherein the second PPG signal is in a target frequency band range,
• performing Hilbert transform on the second PPG signal to obtain an analytic signal of the second PPG signal, wherein a derivative of a phase of the analytic signal is an instantaneous frequency,
• performing notch processing on the analytic signal to obtain a third PPG signal, wherein the third PPG signal does not comprise a motion interference signal, and
• filtering the third PPG signal through M filters to obtain the M harmonic signals;
• outputting the first heart rate based on the confidence of the first heart rate meeting a preset confidence condition;
• and
• displaying the first heart rate.

A non-transitory computer-readable storage medium, storing a computer program that, when executed by an electronic device, causes the electronic device to perform operations including:

• determining that a wearer of the electronic device is a living body;
• obtaining a first photoplethysmograph (PPG) signal;
• determining a first heart rate and a confidence of the first heart rate according to the first PPG signal, wherein the confidence of the first heart rate is determined based on weight coefficients of M harmonic signals, wherein the M harmonic signals are determined according to the first PPG signal within a preset time, and M is an integer greater than or equal to 2, the determining the first heart rate and the confidence of the first heart rate comprising:
• calculating a corresponding weight coefficient of each of the M harmonic signals;
• determining a corresponding confidence of the corresponding weight coefficient of each of the M harmonic signals to obtain M confidences;
• and
• using a highest confidence among the M confidences as the confidence of the first heart rate, wherein the calculating the corresponding weight coefficient of each of the M harmonic signals comprises:
• calculating a relative error of each harmonic signal relative to an ideal signal, wherein the ideal signal is obtained by multiplying a previous signal at a previous moment of a current moment by a phase at a next moment, and
• dividing the relative error of each harmonic signal by a sum of relative errors of the M harmonic signals to obtain the corresponding weight coefficient of each of the M harmonic signals;
• outputting the first heart rate based on the confidence of the first heart rate meeting a preset confidence condition;
• and
• displaying the first heart rate.