Methods and apparatus for adaptive filtering of signals of continuous analyte monitoring systems

A method of continuous analyte monitoring (CAM), comprising:

• providing one or more biosensors comprising a working electrode and a counter electrode;
• generating in an environment, using the one or more biosensors, a CAM signal, wherein
• generating in the environment the CAM signal comprises:
• applying a voltage across the working electrode and the counter electrode;
• measuring a current associated with the working electrode, wherein the current is proportional to an analyte concentration in the environment;
• and
• generating the CAM signal using the current;
• applying adaptive filtering to the CAM signal using an adaptive filter to generate an adaptively-filtered CAM signal, wherein applying the adaptive filtering comprises:
• computing a noise level in the environment;
• switching one or more low-pass filters into a closed state, the one or more low-pass filters including one or more cut-off frequencies,
• wherein switching the one or more low-pass filters into the closed state is a function of the noise level such that all of the one or more low-pass filters are switched into the closed state when the noise level is zero;
• passing the CAM signal through the one or more low-pass filters such that one or more frequencies of the CAM signal are filtered out upon reaching the one or more cut-off frequencies;
• and
• changing the one or more cut-off frequencies as a function of the noise level;
• and
• increasing attenuation of the adaptive filtering as a function of increasing the noise level in the environment, wherein the adaptive filtering with increased attenuation is applied to a following CAM signal generated by the one or more biosensors.

A continuous analyte monitoring system, comprising:

• one or more biosensors comprising a working electrode and a counter electrode, wherein the one or more biosensors are configured to general a signal;
• an adaptive filter configured to increase filtering of the signal as a function of increasing noise on the signal, comprising:
• one or more low-pass filters having one or more cut-off frequencies;
• and
• one or more filter switches electronically connected to the one or more low-pass filters, wherein the one or more filter switches are configured to toggle the one or more low-pass filters between a closed state and an open state;
• and
• one or more non-transitory computer-readable media comprising computer-executable instructions that, when executed by at least one processor, perform a method of filtering the signal in the continuous analyte monitoring system, comprising:
• computing a noise level in an environment;
• generating, using the one or more biosensors in the environment, the signal, wherein generating the signal comprises:
• applying a voltage across the working electrode and the counter electrode;
• measuring a current associated with the working electrode, wherein the current is proportional to an analyte concentration in the environment;
• and
• generating the signal using the current;
• applying adaptive filtering to the signal to generate a filtered continuous analyte monitoring signal during an analyte monitoring period, wherein applying the adaptive filtering to the signal comprises:
• switching the one or more low-pass filters into the closed state,
• wherein switching the one or more low-pass filters into the closed state is a function of the noise level such that all of the one or more low-pass filters are switched into the closed state when the noise level is zero;
• passing the signal through the one or more low-pass filters such that one or more frequencies of the signal are filtered out upon reaching the one or more cut-off frequencies;
• and
• changing the one or more cut-off frequencies as a function of the noise level;
• and
• increasing the adaptive filtering applied to the signal as a function of the noise level increasing to a following signal generated by the one or more biosensors.