Many diseases caused by respiratory and circulatory morbidity, such as sleep apnea, arteriosclerosis, and myocardial infarction, are serious, and by the time symptoms appear, it is likely to be too late; therefore, early detection of signs and treatment are necessary.

In this project, as a technology for detecting these signs of respiratory and circulatory diseases, we use an ultra-low frequency microphone placed in the carotid artery epithelium to collect "internal body sounds" and apply blind source separation to these internal body sounds to separate them into three components: heartbeat sound, pulse sound The technology is based on the separation of the three components of "heartbeat," "pulse," and "breath sounds" by applying Blind Source Separation to the body sounds. By detecting periodic abnormalities and acceleration pulse waves from these separated sounds, signs of respiratory and circulatory diseases can be detected.

Ultra-low-frequency Microphone (Upper side)
Ultra-low-frequency Microphone (Lower side)
Inner-body Sounds Logger
Field-test scene (by graduate student)
Inner-body sounds (Mixture sound)
Separated sound components (Breath, blood pulse, and heartbeat sound)