Blood pressure detection signal sampling and compensation method and apparatus, and blood pressure signal collection system

A blood pressure signal sampling system, comprising an electrocardiogram (ECG) sampling module, a photoplethysmogram (PPG) sampling module, and at least one processor, wherein

• the processor is configured to:
• control the ECG sampling module and the PPG module to simultaneously sample a standard periodic signal;
• separately obtain sampling frequencies and sampling end times of the ECG sampling module and the PPG sampling module for the standard periodic signal;
• compensate for a sampling frequency of the ECG sampling module if a sampling frequency deviation of the ECG sampling module for the standard periodic signal exceeds a preset frequency threshold, wherein the compensating causes the sampling frequency deviation of the ECG sampling module for the standard periodic signal to be less than the preset frequency threshold;
• compensate for a sampling frequency of the PPG sampling module if a sampling frequency deviation of the PPG sampling module for the standard periodic signal exceeds the preset frequency threshold, wherein the compensating causes the sampling frequency deviation of the PPG sampling module for the standard periodic signal to be less than the preset frequency threshold;
• and
• compensate for a sampling start time of the ECG sampling module or the PPG sampling module if a sampling end time difference between the ECG sampling module and the PPG sampling module for the standard periodic signal exceeds a preset time threshold, wherein the compensating causes the sampling end time difference between the ECG sampling module and the PPG sampling module for the standard periodic signal to be less than the preset time threshold.