著者

中迫 昇 篠原 寿広 上保 徹志 英 慎平

出版者

一般社団法人 システム制御情報学会

雑誌

システム制御情報学会 研究発表講演会講演論文集

巻号頁・発行日

vol.10, pp.222, 2010

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人間は身の回りの気配を察知することができ、とくに盲人の方はその能力が高い。近年、気配察知のメカニズムが、音による干渉とLocalizationからなることが報告されている。本研究では、人間の持つ気配察知能力の解明とコンピュータによるその実現を究極の目標として、可聴音を用いた距離推定について基礎的な研究を行い、シミュレーションや実際の音場での実験を通じてその有効性を検証する。

著者

英 慎平 上保 徹志 土田 悠太 篠原 寿広 中迫 昇

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.129, no.11, pp.2027-2033, 2009-11-01

被引用文献数

3

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In many engineering fields, distance to target is very important and fundamental information. Acoustical signal often plays an essential role in measurement of distance. Though there are distance measurement methods using a time delay between transmitted and reflected waves, it is difficult to measure short distance because the reflected waves are often buried in the transmitted wave for short distance. Recently, a method for measuring the short distance has been proposed using standing wave. We applied the fundamental principle of this method to the estimation of short distance using audible sound as a transmitted wave. This method enabled us to obtain range spectrum from power spectrum of composite sound, but it required Fourier Transfom twice. This paper introduces the chirp signal, which is a signal such that the frequency changes with lapse of time, as a transmitted wave, and an interference arises due to the superposition of transmitted and reflected waves. Since the period of power fluctuation for the composite sound is inversely proportional to the distance between microphone and target, we propose a new distance estimation method by using chirp signal as a transmitted wave. Finally, we also confirm the validity of the proposed method through computer simulation and by experiment in an actual sound field.