Tom Tom International B.v.

Tomtom Polska Sp. Z O.o

Nelson Miguel Da Cruz Gonçalves

Marcin Michal Kmiecik

Ying-Lin Lai

A method of compressing data output from one or more accelerometers configured to be transported, carried or worn by a user is provided. Acceleration values indicative of the movement of the user are measured at a first frequency and values representative of the measured acceleration values are generated at a second frequency, which is lower than the first frequency. The step of generating comprises: defining a plurality of time windows, each time window containing a plurality of measured acceleration values; and applying a transformation to the measured acceleration values within each time window to generate a plurality of transformed values. For each time window, storing at least one of said plurality of transformed values and/or one or more parameters associated therewith.

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Lódz, Poland

Nelson Miguel Da Cruz Gonçalves