Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Unvoiced Speech Recognition Using Tissue-Conductive Acoustic Sensor | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 94068 11 pages doi 2007 94068 Research Article Unvoiced Speech Recognition Using Tissue-Conductive Acoustic Sensor Panikos Heracleous 1 2 Tomomi Kaino 1 Hiroshi Saruwatari 1 and Kiyohiro Shikano1 1 Graduate School of Information Science Nara Institute of Science and Technology 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan 2 Department of Computer Science University of Cyprus 75 Kallipoleos Street . Box537 1678 Nicosia Cyprus Received 22 September 2005 Revised 6 January 2006 Accepted 30 January 2006 Recommended by Matti Karjalainen 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. Copyright 2007 Panikos Heracleous et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is .
