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EURASIP Journal on Advances in Signal Processing
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Unvoiced Speech Recognition Using Tissue-Conductive Acoustic Sensor

EURASIP Journal on Advances in Signal Processing volume 2007, Article number: 094068 (2006) Cite this article

Abstract

We present the use of stethoscope and silicon NAM (nonaudible murmur) microphones in automatic speech recognition. NAM microphones are special acoustic sensors, which are attached behind the talker's ear and can capture not only normal (audible) speech, but also very quietly uttered speech (nonaudible murmur). As a result, NAM microphones can be applied in automatic speech recognition systems when privacy is desired in human-machine communication. Moreover, NAM microphones show robustness against noise and they might be used in special systems (speech recognition, speech transform, etc.) for sound-impaired people. Using adaptation techniques and a small amount of training data, we achieved for a 20 k dictation task a word accuracy for nonaudible murmur recognition in a clean environment. In this paper, we also investigate nonaudible murmur recognition in noisy environments and the effect of the Lombard reflex on nonaudible murmur recognition. We also propose three methods to integrate audible speech and nonaudible murmur recognition using a stethoscope NAM microphone with very promising results.

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Authors and Affiliations

  1. Graduate School of Information Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma-shi, Nara, 630-0192, Japan

    Panikos Heracleous, Tomomi Kaino, Hiroshi Saruwatari & Kiyohiro Shikano

  2. Department of Computer Science, University of Cyprus, 75 Kallipoleos Street, P.O. Box 537, Nicosia, 1678, Cyprus

    Panikos Heracleous

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  1. Panikos Heracleous
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  2. Tomomi Kaino
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  3. Hiroshi Saruwatari
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  4. Kiyohiro Shikano
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Correspondence to Panikos Heracleous.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Heracleous, P., Kaino, T., Saruwatari, H. et al. Unvoiced Speech Recognition Using Tissue-Conductive Acoustic Sensor. EURASIP J. Adv. Signal Process. 2007, 094068 (2006). https://doi.org/10.1155/2007/94068

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  • DOI: https://doi.org/10.1155/2007/94068

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