Motion determination apparatus

摘要

The invention relates to a motion determination apparatus for determining motion of a moving object, wherein the motion determination apparatus (1) comprises a multi-axial accelerometer (2) for being positioned at the moving object (4), wherein the multi-axial accelerometer (2) is adapted to generate accelerometer signals indicative of the acceleration along different spatial axes. The motion determination apparatus further comprises a motion signal generation unit (3) for generating a motion signal indicative of the motion of the object (4) by combining the accelerometer signals of different spatial axes. The combination of the accelerometer signals of different spatial axes yields a motion signal having a large signal-to-noise ratio, even if an axis is located close to a rotational axis of the movement.

主权项

1. A motion determination apparatus for determining respiration and heart activity, wherein the motion determination apparatus comprises:
at least one accelerometer configured to be positioned on a subject, wherein the at least one accelerometer is adapted to generate accelerometer signals indicative of the acceleration along at least three different spatial axes; and at least one computer configured to generate motion signals indicative of respiration and heart activity including respiratory rate and heart rate by combining the accelerometer signals of different spatial axes; wherein the at least one computer is further configured to linearly combine the accelerometer signals of different spatial axes, wherein the accelerometer signals are weighted such that the accelerometer signal having the largest acceleration change has the largest weight; wherein the at least one computer is further configured to determine the weight of an accelerometer signal depending on a correlation of the respective accelerometer signal with the accelerometer signal having the largest acceleration change, wherein the weight of the respective accelerometer signal is the sign of the correlation; wherein the motion determination apparatus further comprises:
a heart rate determination device configured to determine a heart rate depending on the weight of the respective accelerometer signal.