US Patent 8680991 Personal emergency response appliance

A personal emergency system includes a motion sensor wearable by a human being to sense motion of the human being; a processor; wireless communications circuitry; computer code to match the acceleration signature with at least one of a plurality of stored acceleration signatures, wherein each stored acceleration signatures corresponds with one or more types of motion; and computer code to identify the type of motion of the object based on the matching of the acceleration signature. An optional positioning system can be included where the location of the user is determined based on times of arrival of signals.