Sound Systems for Emergency Purposes is definite and succinct in its specification of intelligibility; it shall be 0.5 STI (HASTI) as measured in accordance with BS 6840: Part 16.Both Standards are now under review.An IOA Woking Party was formed to review the various methods of assessing speech intelligibility and in view of the fact that there are several valid alternative methods for measuring intelligibility and that RASTI should not be used to measure a non-linear sound system, the Working Party decided that alternative intelligibility measures should therefore be considered. INTELLlGlBlLlTY MEASUREMENT TECHNIQUESBy virtue of the nature of the parameter under audit the measurement methods themselves can only attempt to provide a result which offers a degree of correlation between it and speech intelligibility.
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BARNETT et al. (2024) studied this question.
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