A pilot study on adequate sound levels for acoustic signs for the visually impaired

Author: Nagahata Koji   Yamauchi Katsuya   Ueda Mari   Iwamiya Shin-ichiro  

Publisher: Institute of Noise Control Engineering

ISSN: 0736-2501

Source: Noise Control Engineering Journal, Vol.55, Iss.2, 2007-03, pp. : 217-223

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