Lightweight automatic gain control for ambulatory monitoring systems
OwnerYongji Fu, Bryan Severt Hallberg +1inventors
InventorsYongji Fu, Bryan Severt Hallberg, Bharat Kumar Vegesna
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Abstract
Lightweight automatic gain control (AGC) methods and systems reduce usage of often scarce computing resources in ambulatory monitoring systems through an AGC algorithm that relies on lightweight calculations and judicious constraints on gain reevaluations and adjustments. Statistical range sampling is used to adjust the gain of a physiological signal to keep the signal within a target amplitude range and may be coupled with dynamic range control to prevent gain adjustments from occurring too frequently. Moreover, gain reevaluations and adjustments may be temporarily suspended when the physiological signal is noisy.
Claims20
An automatic gain control (AGC) method for an ambulatory monitoring system, comprising the steps of:
- continually monitoring, by the system, for gain reevaluation events;
- reevaluating, by the system, a gain of a physiological signal in response to a gain reevaluation event, including sampling the physiological signal to obtain a first plurality of samples, determining a share of the first plurality of samples that is outside a target amplitude range and comparing the share with a first limit share;
- and
- adjusting, by the system, the gain based at least in part on a determination that the share exceeds a first limit share.
An AGC method for an ambulatory monitoring system, comprising the steps of:
- reevaluating, by the system, a gain of a physiological signal including comparing the physiological signal with a target amplitude range;
- adjusting, by the system, the gain in response to the comparison;
- and
- adjusting, by the system, the target amplitude range in response to a determination that a gain adjustment rate exceeds a limit rate.
An AGC method for an ambulatory monitoring system, comprising the steps of:
- reevaluating, by the system, a gain of a physiological signal including comparing the physiological signal with a target amplitude range;
- adjusting, by the system, the gain in response to the comparison;
- and
- temporarily suspending, by the system, the gain reevaluating and gain adjusting steps in response to a determination that a noise level of the physiological signal exceeds a limit noise level.
Dependencies are inferred from the claim text.