Methods and systems for calculating physiological parameters

A system for calculating a physiological parameter, comprising:

• a sensor comprising at least one light emitting tube and at least one receiving tube, the light emitting tube emitting at least two optical signals of different wavelengths for transmitting through a physiological tissue, and the receiving tube receiving the at least two optical signals transmitted through the physiological tissue and converting the at least two optical signals received into electrical signals;
• an analog to digital converter connected to the sensor to convert the electrical signals into digital signals, the digital signals include at least some of the characteristics of the physiological tissue;
• a digital processor connected to the analog to digital converter, the digital processor performing the following processes:
• performing a time-to-frequency domain transformation on a section of the digital signal to obtain a corresponding frequency domain signal;
• selecting all rational frequency spectrum peaks, calculating position information of the selected rational frequency spectrum peaks, and forming a frequency spectrum peak position sequence;
• constructing a time-varying array map according to the frequency spectrum peak position sequence, and constructing at least one stability factor for each position point that varies over time to form a stability factor array map;
• constructing a stability coefficient based on the stability factor array map, and if the stability coefficient is relatively low, calculating a compensation coefficient by using the stability factor array map;
• and
• compensating for at least one of the time domain signal and the frequency domain signal by using the compensation coefficient, and calculating the physiological parameter based on at least one of the compensated digital signal and frequency domain signal.

A method for calculating a physiological parameter, comprising:

• selecting a section of a time domain signal corresponding to at least one signal of red light and infrared light obtained by sampling, and performing a time-to-frequency domain transformation on the section of the time domain signal to obtain at least one frequency domain signal;
• selecting all rational frequency spectrum peaks from the frequency domain signal, calculating at least one of energy and position information of the selected rational frequency spectrum peaks, and forming at least one of a frequency spectrum peak energy ratio sequence and a frequency spectrum peak position sequence;
• constructing a stability coefficient according to at least one of the frequency spectrum peak energy ratio sequence and the frequency spectrum peak position sequence, and if the stability coefficient is relatively low, constructing a compensation coefficient by using at least one of the frequency spectrum peak energy ratio sequence and the frequency spectrum peak position sequence;
• and
• compensating for at least one of the time domain signal and the frequency domain signal by using the compensation coefficient, and calculating the physiological parameter based on at least one of the compensated time domain signal and frequency domain signal.