Phase-lock averaging for noise removal from physiological signals

A method for removing noise from signal data obtained from a non-invasive blood monitor, the method comprising the steps of:

• receiving signal data from a non-invasive blood monitor;
• detrending at least a portion of the signal data to create a detrended signal;
• stacking the detrended signal into a matrix;
• and
• taking a singular value decomposition of the matrix.

A system for removing noise from signal data, comprising:

• a radiation generator configured to generate electromagnetic radiation;
• a sensor configured to receive reflected electromagnetic radiation from the radiation generator;
• a detrending module configured to detrend a signal from data obtained from the sensor;
• a stacking module configured to stack a detrended signal obtained from the detrending module;
• a singular value decomposition module configured to take a singular value decomposition of the detrended signal;
• and
• a signal reconstruction module configured to obtain a pulse shape and/or a one or more pulse amplitudes from the singular value decomposition.