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Sensors 2011, 11(7), 6760-6770; doi:10.3390/s110706760

Collaborative Processing of Wearable and Ambient Sensor System for Blood Pressure Monitoring

1,* , 1
1 NTT Energy and Environment Systems Laboratories, Nippon Telegraph and Telephone Corporation, Morinosato Wakamiya, Atsugi-shi, Kanagawa Pref. 243-0198, Japan 2 School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
* Author to whom correspondence should be addressed.
Received: 7 April 2011 / Revised: 16 June 2011 / Accepted: 24 June 2011 / Published: 28 June 2011
(This article belongs to the Special Issue Collaborative Sensors)
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This paper describes wireless wearable and ambient sensors that cooperate to monitor a person’s vital signs such as heart rate and blood pressure during daily activities. Each wearable sensor is attached on different parts of the body. The wearable sensors require a high sampling rate and time synchronization to provide a precise analysis of the received signals. The trigger signal for synchronization is provided by the ambient sensors, which detect the user’s presence. The Bluetooth and IEEE 802.15.4 wireless technologies are used for real-time sensing and time synchronization. Thus, this wearable health-monitoring sensor response is closely related to the context in which it is being used. Experimental results indicate that the system simultaneously provides information about the user’s location and vital signs, and the synchronized wearable sensors successfully measures vital signs with a 1 ms resolution.
Keywords: blood pressure sensor; wearable sensor; ambient sensor; synchronization blood pressure sensor; wearable sensor; ambient sensor; synchronization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Nakamura, M.; Nakamura, J.; Lopez, G.; Shuzo, M.; Yamada, I. Collaborative Processing of Wearable and Ambient Sensor System for Blood Pressure Monitoring. Sensors 2011, 11, 6760-6770.

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