A low-power wireless interface for human gait assessment

The instrumentation for quantitative gait assessment must be small, lightweight and comfortable, in order to enable unconstrained mobility of tested subjects. In this paper, a design of a low-power multichannel wireless interface for kinetic gait measurement system is presented. Particular system feature is application of wireless telemetry. Power consumption of the battery powered wearable unit was reduced using a minimum number of low-power commercial components together with low-power design techniques. A new capacitive sensor interface circuit based on constant current pulse driving is shown. Power efficient optical wireless transmission employing digital pulse position modulation and "quasidiffuse" link is described.