Abstract

A system using NAM (non-audible murmur) microphones was also reported. NAM microphone was developed to detect a very weak speech sound. We made a body conduction sound sensor based on NAM microphone. It is applicable to measure a sound of heart, breath and a variety of sounds in the body. Easy handling supports the superiority of the sensor. In this study, we made an evaluation system for the body conduction sound sensor. It is an inexpensive. We evaluated some sensors using the system. We made of body conduction sound sensor and evaluation speaker. The body conduction sound sensor are made using electret condenser microphone (ECM). We pass a signal from the PC to the speaker, and then detected by the sensor. We perform the measurement with 2 channel and A/D conversion about the signal flow in speaker and the signal detected by the sensor. We derive the frequency characteristic from the measured 2 channel signal.

Highlights

  • Solitary death of elderly people is recognized as social problem in Japan

  • A sound that produced and propagated inside of the body is measured by a body conduction sound sensor that is put on the body surface

  • We made a body conduction sound sensor based on NAM microphone(5-7)

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Summary

Introduction

Solitary death of elderly people is recognized as social problem in Japan. It is difficult to substantiate a system which monitor them using camera because of lack of privacy. Some researchers reported a system to find unusual sounds of the heart, and an analysis method was reported that finds an abnormal cardiac sound measured by the wireless electronic stethoscope(1-3). NAM microphone was developed to detect a very weak speech sound. NAM microphone can be produced more cheaply than the electronic stethoscope, and has an advantage in commercialization. We made a body conduction sound sensor based on NAM microphone(5-7). The frequency characterization of the body conduction sound sensor have been reported by a evaluation method using a vibration exciter(8). We made an evaluation system for the body conduction sound sensor. It is expected that a system contributes progress in a development of the body conduction sound sensor

The Body Conduction Sound Sensor
Evaluation System
Experiment

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