alexa Monitoring of breath sound under daily environment by ceiling dome microphone. In System, Man and Cybernetic
Biomedical Sciences

Biomedical Sciences

Journal of Biomedical Systems & Emerging Technologies

Author(s): Nishida Y, Hori T, Suehiro T, Hirai S

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This paper proposes a new method for monitoring normal breath sounds in a daily environment where many kinds of noises exist. In a typical conventional breath monitor, a thermistor, an accelerometer, or a contact-type microphone must be attached directly to a person's body such as a part around the nose and the mouth, or a part over the chest wall and the trachea. This paper focuses on key issues stemming from a factor of the environment: extraction of breath sounds from sensor signals contaminated by environmental noise; and realization of a monitoring system suitable for our homes. Features of normal breath sounds are clarified by frequency analysis. Based on the features, a method for extracting normal breath sounds is discussed. This paper also describes a ceiling dome microphone which is a kind of a parabolic sound concentrator. It realizes a function of detecting normal breathing sounds with high sensitivity while keeping a room's appearance natural. The gain obtained by such a concentrator is analyzed theoretically from the acoustic point of view. Experimental results proved the feasibility of the proposed method. This article was published in IEEE International Conference and referenced in Journal of Biomedical Systems & Emerging Technologies

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