NDLI: Robust acoustic distance measurement method based on interference in noisy environments

Content Provider	IEEE Xplore Digital Library
Author	Nakayama, M. Hanabusa, S. Nakasako, N. Uebo, T.
Copyright Year	2010
Description	Author affiliation: Faculty of Biology-Oriented Sc. & Tech., Kinki University, Nishi-Mitani 930, Kinokawa, Wakayama, 649-6493 Japan (Nakayama, M.; Hanabusa, S.; Nakasako, N.; Uebo, T.)
Abstract	Distance to target is fundamental and very important information in many engineering fields. Many distance measurement methods with sound utilize the time delay of reflected wave which is measured with reference to transmitted one. This method, however, can not measure short distance because the transmitted wave, which has not attenuated enough as of reception of reflected waves, suppresses the reflected waves for short distance. Therefore we proposed acoustic distance measurement method based on interference between transmitted wave and reflected waves, which could measure distance in short range. However, the performance of our method was not discussed in noisy environments. In this paper, we focus discussion on noisy environments with additive noise. We describe our method using real measuring system in noisy environments. In addition, we propose suitable noise reduction for our method by applying an idea of synchronous addition and spectral subtraction in noisy environments. Finally, we confirm the effectiveness of our method using noise reduction through simulation and experiment. As a result, it has been confirmed that the distance can be measured at SNR = 5 or 15 dB by our method without using noise reduction and can be measured at SNR = −5 to 5 dB by our method using noise reduction.
Starting Page	176
Ending Page	181
File Size	178489
Page Count	6
File Format	PDF
ISBN	9781424470075
e-ISBN	9781424470105
e-ISBN	9781424470099
DOI	10.1109/ISCIT.2010.5664833
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-26
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Additive noise Noise reduction Distance measurement Noise measurement Signal to noise ratio
Content Type	Text
Resource Type	Article

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