ACCELEROMETER WITH AN AUTOMATIC CALIBRATION

摘要

The invention relates to a device (1) for measuring an activity of a person (I) comprising a mult-axes sensor (3), comprising accelerometers (3X, 3Y, 3Z) arranges in orthogonal directions. The multi-axes sensor (3) is arrange to produce an electric signal relative to a motion exhibited by the person (I). The device (1) comprises calibration means (5) for purposes of enabling an automatic calibration of gain and offset values of said accelerometers (3X, 3Y, 3Z) in an automatic mode. The calibration means (5) comprise computing means (7) arrange to identify suitable periods for enabling the automatic calibration. The computing means (7) of the device (1) according to the invention are arranged to detect the temporal periods corresponding to a rest of the person (I), said periods being characterized by a minimal signal changes over an interval of, for example, few seconds. Upon a detection of such rest period the computing means are actuated to carry out the automatic gain and offset calibration according to a suitable computing algorithm.