Abstract
Differing approaches to quantifying speech intelligibility exist within ASTM architectural acoustic standards E1130 and E2638. E1130 was written for open office conditions and to cover a wide range of intelligibility levels. E2638 was written for enclosed room scenarios and focuses on speech privacy at confidential levels or higher. Each is currently being evaluated with respect to the possibility of expansion to include both open and closed settings. One difference between the two methodologies pertains to whether background sound level frequencies are weighted or averaged. This paper explores how frequency weighting of background sound levels is significant in the determination of speech intelligibility/privacy/security.
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