Silent-speech enhancement using body-conducted vocal-tract resonance signals
スポンサーリンク
概要
- 論文の詳細を見る
The physical characteristics of weak body-conducted vocal-tract resonance signals called non-audible murmur (NAM) and the acoustic characteristics of three sensors developed for detecting these signals have been investigated. NAM signals attenuate 50 dB at 1 kHz; this attenuation consists of 30-dB full-range attenuation due to air-to-body transmission loss and 10 dB/octave spectral decay due to a sound propagation loss within the body. These characteristics agree with the spectral characteristics of measured NAM signals. The sensors have a sensitivity of between 41 and 58 dB [V/Pa] at I kHz, and the mean signal-to-noise ratio of the detected signals was 15 dB. On the basis of these investigations, three types of silent-speech enhancement systems were developed: (1) simple, direct amplification of weak vocal-tract resonance signals using a wired urethane-elastomer NAM microphone, (2) simple, direct amplification using a wireless urethane-elastomer-duplex NAM microphone, and (3) transformation of the weak vocal-tract resonance signals sensed by a soft-silicone NAM microphone into whispered speech using statistical conversion. Field testing of the systems showed that they enable voice impaired people to communicate verbally using body-conducted vocal-tract resonance signals. Listening tests demonstrated that weak body-conducted vocal-tract resonance sounds can be transformed into intelligible whispered speech sounds. Using these systems, people with voice impairments can re-acquire speech communication with less effort. (C) 2009 Elsevier B.V. All rights reserved.
論文 | ランダム
- 120 先天性胆道閉鎖症における血清肝線維化マーカーの検討
- 頭蓋内出血で発見された先天性胆道閉鎖症の1例
- 先天性胆道閉鎖症
- 27. 先天性胆道閉鎖症根治術後長期にわたり食思不振の続いている 1 症例(第 16 回胆道閉鎖症研究会)
- 4. 先天性胆道閉鎖症患児における栄養障害について : 特に脂質栄養の問題点(第 19 回日本小児外科代謝研究会)