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Realization of Audio Guide System with High Articulation Using Super-directivity

利用超指向性实现高清晰度语音导览系统

基本信息

批准号：
19310105
负责人：
KAMAKURA Tomoo
金额：
$ 6.99万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2007
资助国家：
日本
起止时间：
2007 至 2008
项目状态：
已结题

项目摘要

本研究では, 必要な音声情報を必要な場所にだけ的確に伝える高明瞭度音響案内・誘導システムの実現を目指した。ここでは, 超音波を音声信号で変調して空間内に送波し, 超音波の自己復調現象を利用して音声を空間内に再生する,超指向性音響システムの開発を行った。いままでの研究成果を踏まえて, 本研究期間では, 特に超音波の音圧レベルの低減化を目指し, 超音波エミッタの適切な駆動方式を検討した。すなわち, 本システムは強力な超音波を使用するために, これが聴取者の聴覚器官に何らかの悪影響を及ぼすことが危惧される。従って,超指向性音響システムを有効に利用するためには, 可聴音の音圧レベルは下げず, また超指向性という特長を生かしたまま, できる限り超音波の音圧レベルを下げる必要がある。この目的のために, ここでは超音波エミッタを偶数個の開口に分割して,それぞれの開口のエミッタを互いに逆位相を駆動し,空間内で超音波を打ち消し合う, 空間位相反転方式を提案し, 超音波の音圧の低減化を図った。開口の数にも依るが, 2個の開口に分割したとき,従来の駆動方式に比べて, 音軸上でおよそ10~20dBの超音波の音圧レベルの低減化が実現された。これと同時に, 従来から問題になっていた, 再生可聴音の高調波歪みも10dB以上低減できた。この歪み低減は音声明瞭度に直接関わり, 高明瞭度な超指向性音響システムの実現に大きな前進となった。

In this study, it is necessary to pay attention to the sound and emotion of the market, and to make sure that they have a good understanding of the situation in the project. The ultrasonic signal is used to transmit the sound signal in the space, the ultrasonic signal is used to transmit the sound signal in the space, the ultrasonic signal is used to transmit the sound signal in the space, the ultrasonic signal is used to transmit the wave in the space, and the ultrasonic signal is used to transmit the sound signal in the space. The results of the research are very good. During the period of this study, the ultrasonic equipment was used to lower the target, and the ultrasonic wave was used to cut the movement mode. In this case, the use of ultrasound, the use of ultrasound. The super-directional sound can be used to make use of the super-directional sound to make use of the sound, and the super-directional sound can produce the necessary sound. The purpose of this paper is to carry out the proposal of the opposite mode of the ultrasonic wave, the proposal of the opposite mode of the ultrasonic wave in the space, the proposal of the opposite mode of the ultrasonic wave in the space, and the reverse phase wave of the ultrasonic wave in the space. the purpose of this paper is to carry out the proposal of the opposite mode of the ultrasonic wave, and to realize the low phase of the ultrasonic wave in the space. The number of openings depends on the temperature, and the two openings are divided, the modes of motion are compared, and the sound is switched on to the 10~20dB, and the sound is reduced to a low level. At the same time, it is necessary to solve the problem and regenerate the high pitch and skew waves above the 10dB. The crooked bass pronounces that the degree of understanding is direct, and that the superdirectional tone is superior to the super-directional tone.