Abstract: Disclosed are a heart rate detection system and a wearable device using the same. The heart rate detection system includes a light emitting unit, a light sensor and a processor. The light emitting unit emits a light to a human body. The light sensor senses a reflected light of the light and accordingly generates a first electric signal. The processor calculates the low-frequency noise signal and the high-frequency noise signal of the first electric signal, and removes them. After that, the processor executes a peak detection with respect to the first electric signal to calculate peak values of the first electric signal, and calculate a heart rate based on the time intervals among the peak values.

Abstract: Disclosed are a heart rate detection system and a wearable device using the same. The heart rate detection system includes a light emitting unit, a light sensor and a processor. The light emitting unit emits a light to a human body. The light sensor senses a reflected light of the light and accordingly generates a first electric signal. The processor calculates the low-frequency noise signal and the high-frequency noise signal of the first electric signal, and removes them. After that, the processor executes a peak detection with respect to the first electric signal to calculate peak values of the first electric signal, and calculate a heart rate based on the time intervals among the peak values.

Abstract: An ambient light sensing method is provided. The ambient light sensing method comprises: acquiring the sensitivity settings, an exposure time and obtaining a sensing signal of a light sensor according to the sensitivity settings and the exposure time; determining whether the magnitude of the sensing signal is within a predetermined range when the sensing signal is available, wherein the predetermined range has an upper value and a lower value; updating the sensitivity settings and the exposure time of the light sensor according to the determined result for the magnitude of the sensing signal; and acquiring the sensing signal of the light sensor with the updated sensitivity settings and the updated exposure time.

Abstract: An ambient light sensing method, comprising: acquiring the sensitivity settings, an exposure time and obtaining a sensing signal of a light sensor according to the sensitivity settings and the exposure time; determining whether the magnitude of the sensing signal is within a predetermined range when the sensing signal is available, wherein the predetermined range has an upper value and a lower value; updating the sensitivity settings and the exposure time of the light sensor according to the determined result for the magnitude of the sensing signal; and acquiring the sensing signal of the light sensor with the updated sensitivity settings and the updated exposure time.