Blood Oxygen Saturation Estimation with Laser-Induced Graphene Respiration Sensor

Table 1

Common features of the respiratory signals.

Amplitude features
Peak amplitude	Maximum value of the respiratory signal
Trough amplitude	Minimum value of the respiratory signal
Mean amplitude	Average value of the respiratory signal
Standard deviation	Measures how far the signal fluctuates from the mean
Time-domain features
Breath duration	Duration of each individual breath in the respiratory signal
Respiratory rate	Number of breaths per minute, calculated using frequency analysis or peak detection methods
Variability features
RRV mean	Average value of respiratory rate variability across a specific time period
RRV std	Provides information about the degree of variability in the respiratory rate intervals
Shape features
Rise time	Refers to the time it takes for the signal to transition from a baseline or resting state to a peak or maximum value
Fall time	Refers to the time it takes for the signal to transition from a peak or maximum value back to a baseline or resting state