Kurihara Yosuke, Watanabe Kajiro
Department of Computer and Information Science, Faculty of Science and Technology, Seikei University, Musashino-shi, Tokyo 180-8633, Japan.
IEEE Trans Biomed Circuits Syst. 2012 Dec;6(6):596-604. doi: 10.1109/TBCAS.2012.2189007.
The management of health through daily monitoring of heartbeat and respiration signals is of major importance for early diagnosis to prevent diseases of the respiratory and circulatory system. However, such daily health monitoring is possible only if the monitoring system is physically and psychologically noninvasive. In this paper, an unconstrained method of measuring heartbeat and respiration signals, by using a thermistor to measure the air flows from the air mattress to an air tube accompanying the subject's heartbeat and respiration, is proposed. The SN ratio with interference by opening and closing of a door as environmental noise was compared with that obtained by the conventional condenser microphone method. As a result, the SN ratios with the condenser microphone method were 26.6 ± 4.2 dB for heartbeat and 27.8 ± 3.0 dB for respiration, whereas with the proposed method they were 34.9 ± 3.1 dB and 42.1 ± 2.5 dB, respectively.
通过每日监测心跳和呼吸信号来管理健康状况，对于呼吸系统和循环系统疾病的早期诊断及预防至关重要。然而，只有监测系统在生理和心理上均为非侵入性时，这种日常健康监测才有可能实现。本文提出了一种无约束的测量心跳和呼吸信号的方法，即使用热敏电阻测量伴随受试者心跳和呼吸从气垫流向空气管的气流。将开门和关门作为环境噪声干扰时的信噪比，与传统电容式麦克风方法获得的信噪比进行了比较。结果，电容式麦克风方法的心跳信噪比为26.6±4.2dB，呼吸信噪比为27.8±3.0dB，而所提出方法的心跳信噪比和呼吸信噪比分别为34.9±3.1dB和42.1±2.5dB。
