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Noboru Nakasako,Shimpei Hanabusa,Toshihiro Shinohara,Tetsuji Uebo 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In many engineering fields, distance to target is very important and fundamental information. In a research field of microwave, a method for measuring the short distance has been proposed using interference (i.e. standing wave) of the transmitted and reflected waves. We applied the fundamental principle of this method to the estimation of the short distance using the audible sound as a transmitted wave. Then, we assumed that the microphone was set on the straight line between a sound source and the target. However, the microphone is not always set on the straight line due to the restriction of measuring environment. This paper describes a principle and compensation method of the distance estimation using the geometrical information on alignment of the sound source and microphone in such a situation. Then, we experimented in an actual sound field to confirm the validity and effectiveness of our proposed method using a transmitted wave with uniform amplitude and random phase characteristics.