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In recent years, according to the causes of death ranking, heart disease and pneumonia are on the top of the rank. Heart disease and pneumonia cause the changes of respiratory rate and heart rate respectively. Thus, it is necessary to measure our heart rate and respiratory rate at an early stage. The purpose of this research is the development of the equipment that can measure anyone’s heart rate and respiratory rate by using a body conduction sound sensor. The body conduction sound sensor is composed of electret condenser microphone, acrylic case, and filler. This sensor acquires the sound of the heartbeats and respiratory sounds by attaching the sensor on the left side of the body. As the obtained sound from our body has high-frequency noises, an analog filter is used to remove and filter the noise. After filtered, the obtained sound is transferred as an input to the microcomputer. Then, heart rate and respiratory rate is derived by signal processing. To confirm the effectiveness of the device, an experiment is performed by comparing the value of the heart rate and respiratory rate of the device with the value from self-check.

Simultaneous Measurement of Respiratory Rate and Heart Rate by using Body Conduction Sound Sensor