Abstract: A pulse rate monitor allows a user's pulse rate to be measured and displayed continuously while removing the inaccuracies caused by motion of the user, by detecting the motion level and determining whether an accurate pulse rate measurement can be taken based upon the detected motion. The most recent accurate pulse rate measurement is stored in memory and the pulse rate is estimated when a user is undergoing too much movement for obtaining accurate measurements by using the stored pulse rate and the magnitude of the detected movement.

Abstract: In a power system having a plurality of power units which are supplied with an external power source and output a power source required for a load, multi-way sequential power-on operation is carried out by enabling two power units, designating as masters beforehand, to be turned on immediately when the external power source is turned on. The master, when turned on, transmits a start signal to two other power units, commanding the addressed power unit to be turned on. The addressed power unit, on receipt of a start signal from any of two other power units, turns on and transmits a start signal to two other power units, and thus propagating start signals on two routes beginning with two masters to sequentially turn on power units by twos at a time.