Apparatus and method for heart rate measurement

An optical sensing apparatus configured to obtain a user heart rate value, comprising:

• a motion sensor;
• a light receiver;
• and
• a processor comprising a first calculator and a second calculator, the processor being configured to:
• receive, by the first calculator and from the light receiver, a PPG signal;
• receive, by the second calculator and from the motion sensor, a motion signal;
• determine, by the first calculator, a first heart rate value according to the PPG signal and without the motion signal;
• determine, by the first calculator, a validity indicator according to the PPG signal, wherein the validity indicator represents a signal quality of the PPG signal;
• determine, by the second calculator, a second heart rate value according to the PPG signal and the motion signal;
• select, by a multiplexer in the processor and based on the validity indicator, the first heart rate value or the second heart rate value as the user heart rate value for output;
• and
• output the first heart rate value or the second heart rate value selected by the multiplexer.