Portable electronic device and computer software product

摘要

The invention relates to a portable electronic device and computer software product. The portable electronic device comprises a motion detector (402) for generating motion data characterising the local movement of the portable electronic device, a motion intensity determiner (404) for determining a instantaneous motion intensity value of the user of the portable electronic device from the motion data, and an active time counter (406) for determining an active time accumulation that sums up the time periods, during which the instantaneous motion intensity value meets predefined activity criteria.