The method for estimating the optimum speech level in public spaces considering universal design

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The methods for estimating the optimum speech level from physical acoustic parameters were investigated based on listening tests. The results showed that (1) the optimum speech level in reverberant sound fields should be set to make speech loudness expressed in the sound pressure level of direct speech from 55 to 60 dBA, (2) the optimum parameters for speech amplification in the sound fields where background noise level rapidly shifts were suggested.