Biosignals sensing by novel use of bidirectional microphones in a mobile phone for ubiquitous healthcare monitoring

Kajiro Watanabe; Yosuke Kurihara; Ko Watanabe; Toshihiro Azami; Shoko Nukaya; Hiroshi Tanaka

doi:10.1109/THMS.2014.2320945

Biosignals sensing by novel use of bidirectional microphones in a mobile phone for ubiquitous healthcare monitoring

Kajiro Watanabe, Yosuke Kurihara, Ko Watanabe, Toshihiro Azami, Shoko Nukaya, Hiroshi Tanaka

Tohoku Medical Megabank Organization (ToMMo)

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

This paper describes a novel application of the bidirectional audio microphones in mobile phones to measure biosignals for ubiquitous health monitoring. The bidirectional microphone has two pressure-detecting ports. A pressure-detecting film receives the differential pressure between the ports. We apply this idea to biosignal measurements for a mobile phone. We used the microphone as 1) a sphygmograph at the fingertip, 2) a stethoscope in which a delay time sensor of pulse wave arrivals from the neck near the carotid or chest near the heart to the fingertip, and 3) a bed sensing device for biosignals. When used as a sphygmograph, it detects the wave similar to the second derivative of the conventional optical pulse oxymeter output wave. When used as a stethoscope, it detects cardiac sound and the pulse wave and respiration. With two microphones, the delay time from the neck carotid to the fingertip is detected.

Original language	English
Article number	6844849
Pages (from-to)	545-550
Number of pages	6
Journal	IEEE Transactions on Human-Machine Systems
Volume	44
Issue number	4
DOIs	https://doi.org/10.1109/THMS.2014.2320945
Publication status	Published - 2014 Aug

Keywords

Bidirectional microphone
low-frequency microphone
mobile phone
noninvasive bed sensing
sphygmograph
stethoscope

ASJC Scopus subject areas

Human Factors and Ergonomics
Control and Systems Engineering
Signal Processing
Human-Computer Interaction
Computer Science Applications
Computer Networks and Communications
Artificial Intelligence

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Biosignals sensing by novel use of bidirectional microphones in a mobile phone for ubiquitous healthcare monitoring. / Watanabe, Kajiro; Kurihara, Yosuke; Watanabe, Ko; Azami, Toshihiro; Nukaya, Shoko; Tanaka, Hiroshi.

In: IEEE Transactions on Human-Machine Systems, Vol. 44, No. 4, 6844849, 08.2014, p. 545-550.

Research output: Contribution to journal › Article › peer-review

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