Abstract: A portable electronic device uses the initial heartbeat value to calculate a possible heartbeat variation. Then a reference range is determined. Only the real time heartbeat value falling in the reference range is output as a correct real time heartbeat value. Thus, the too large or too small erroneous heartbeat values influenced by the vibration noise are eliminated to precisely output the correct real time heartbeat value. Therefore, the extra vibration sensors need not to be installed to lower the cost and to reduce the volume.

Abstract: A portable electronic device includes a switching unit, a light source, a light detector and control unit. The user utilizes the switching unit to select the detection mode. The light is emitted from the light source to the object to generate a reflected light. The light detector detects the reflected light to generate a light detecting signal for the control unit to calculate a corresponding result based on the selected mode. Therefore, single portable electronic device can achieve multiple functions and is more convenient for utilization.

Abstract: A portable electronic device for providing a plurality of operation modes, emits light to an object to be sensed via a light source and senses reflected light from the object to be sensed via an optical sensor to generate a sensing signal. Based on this sensing signal, various functions can be performed, for example, remote control, proximity sensing, gesture sensing, hear rate sensing, blood oxygen saturation sensing, exhaled gas alcohol concentration sensing. The portable electronic device provided by the present invention integrate various functions therein and can measure various kinds of physiological parameters, thus is more convenient and helpful for many users.

Abstract: A control method of an electronic apparatus includes the following steps: generating a plurality of detection signals to a non-contact object around the electronic apparatus; receiving a plurality of reflected signals reflected from the non-contact object in response to the detection signals, and accordingly generating a plurality of detection results; performing arithmetic operations upon the detection results to calculate motion information of the non-contact object around the electronic apparatus; recognizing a non-contact gesture corresponding to the non-contact object according to the motion information; and enabling the electronic apparatus to perform a specific function according to the non-contact gesture.