GB/T 14476-1993

This standard specifies the RASTI (Rapid Speech Transmission Index) method for objectively measuring and estimating speech intelligibility in auditoria, concert halls, and other large enclosed spaces. It is applied during the acoustic design, commissioning, and post-construction evaluation of venues to ensure clear speech transmission for audiences, particularly in settings like theaters, conference centers, and lecture halls. The method provides a quantitative, repeatable alternative to subjective listening tests for assessing sound system performance and room acoustics.