System and method for sensing human activity by monitoring impedance

摘要

A system for sensing human activity by monitoring impedance includes a signal generator for generating an alternating current (AC) signal, the AC signal applied to an object, a reactance altering element coupled to the AC signal, an envelope generator for converting a returned AC signal to a time-varying direct current (DC) signal, and an analog-to-digital converter for determining a defined impedance parameter of the time-varying DC signal, where the defined impedance parameter defines an electromagnetic resonant attribute of the object.

主权项

1. A system for sensing interaction, comprising:
a signal generator producing a frequency-swept signal in an object; an impedance measurement component coupled to the object and configured to identify a change in an impedance parameter of the frequency-swept signal as an external body interacts with the object; a switching element selectively coupling a reactive component to an electrical path propagating the frequency-swept signal, wherein the reactive component is selectively coupled to both the signal generator and the impedance measurement component via the switching element, wherein the reactive component is operable to shift a resonant frequency associated with the object based on a state of the switching element; and an interaction signal generator indicating a characteristic of an interaction between the object and the external body based upon the change in the impedance parameter.