| 摘要 |
PURPOSE:To attain a high intelligibility by masking the echo of a voice, which is reproduced by a loudening means, with a noise reproduced by a noise reproducing means. CONSTITUTION:The voice inputted to a microphone is amplified by a mike amplifier 6 and main amplifiers 7a-7d and is reproduced from speakers 8a-8d simultaneously. A noise generating device 9 generates a pink noise, where low- band components are emphasized, or a white noise, and fills up a tunnel with this noise by a speaker 11. Since direct and indirect sounds lower than the noise level are masked with the noise, the intelligibility is improved. |
