To determine the movement of a device, a three-dimensional measurement of the device's
acceleration is provided in known directions with regard to the device, and average Signals
of acceleration Signals parallel to different axes are formed to allow tilt angles of the device
with respect to gravity to be defined. Acceleration change Signals are formed by removing
the average Signals from their respec tive acceleration Signals parallel to the different axes.
The acceleration change Signals and the tilt angles of the device are used for forming a …

… One way of measuring the movement of a mobile device or to determine the user's
activity context is to use one or more accelerometers to measure the accelerations of the
device in one or more directions. Accelerations parallel to different dimensions vary
according to activity context and they are characteristic of each activity context. In principle,
it is therefore possible to identify activity contexts on the basis of the acceleration or … the
invention also relates to an arrangement for determining the movement of a device, the …