Abstract
Application of the speech transmission index to determination of speech intelligibility in indoor industrial environments is described. Equations suitable for engineering use are presented. The effects of reverberation in the direct field of the speech source are accounted for. Presbycusis effects are included in the equations, allowing, for example, calculation of the source level required for 95% of the 40‐year‐olds to attain 97% speech intelligibility. The effects of high ambient noise and hearing protection devices are also described. Effective room volume is required in the calculation. In a building cluttered with machinery, pipes, etc., the effective volume may be a fraction of the physical volume, or one or more of the classical six surfaces may be missing. A practical method of measuring effective volume is described.
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