Abstract:
A method for determining a physiological parameter comprises receiving measured physiological data, parsing the measured physiological data into a plurality of time windows, each time window including a plurality of samples of the physiological data, fitting each of the plurality of time windows to a mathematical function utilizing a fitting function to obtain a plurality of sets of fit parameters, each set associated with a one of the plurality of time windows, and based on the plurality of sets of fit parameters, determining a physiological parameter.
Abstract:
The present disclosure provides a method of calibrating a sensor for use with an electronic device having an analog sensor interface with unknown input and output characteristics that includes connecting a sensor to the electronic device, receiving calibration data comprising a known calibration perturbation and a calibration voltage ratio for the sensor, applying a balancing voltage ratio across first and second arms of a resistive bridge of the unperturbed sensor, the balancing voltage ratio selected such that a response signal measured at a central node is zero, applying the calibration voltage ratio across the first and second arms and detecting a measured calibration response signal at a central node, and adjusting the input and output characteristics of the analog sensor interface based on a difference between the calibration voltage ratio and the balancing voltage ratio such that the measured calibration response signal is representative of the known calibration perturbation.
Abstract:
Methods, systems and related apparatus are provided for controlling an electronic device to operate an external sensor connectable to an audio interface of the electronic device by applying a first harmonic driving signal to a first contact and a second harmonic driving signal to a second contact of the audio interface for driving the external sensor, receiving a response signal at a third contact of the audio interface, adjusting at least one of the first and second harmonic driving signals, determining one or more physiological parameters based on characteristics of the first and second harmonic driving signals and the response signal, and outputting the determined one or more physiological parameters.
Abstract:
Methods, systems and related apparatus are provided to enable an electronic device to operate an external sensor comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths connectable to an audio interface by applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the emitters of the external sensor, receiving the response signal at a third contact of the audio interface, demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal, analyzing the first and second wavelength response signals to determine one or more vital signs, and outputting the determined one or more vital signs.