Patent ID: 8311623

Claim:
A biofeedback device adapted for using the activity of one or more muscles to proportionally control a second electromechanical device, the biofeedback device comprising a first detector configured for detecting a first signal that indicates a time series of surface electromyography measurements, designated sEMG(t), for each time t of a plurality of times from a particular location on a subject, a processor configured for processing the first signal using a nonlinear filter for determining a time series of a stable driving signal x(t), a power source, and a feedback system, the feedback system comprising a motorized device, wherein the feedback system is in electrical communication with the processor, wherein processing the first signal using the nonlinear filter further comprises applying a nonlinear filter that includes a first parameter α that indicates a rate of drift for values of x(t) and an independent second parameter β that indicates frequency of shift in values of x(t); and the feedback system causes the motorized device to apply a sensory feedback to the subject based on the stable driving function.