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Designing for Intelligibility vs. Audibility

From catastrophic natural disasters to the threats college students face, there has been a heightened demand for mass notification systems (MNS) to provide clear, concise and intelligible voice messages that communicate how people should respond in an emergency. Man-made or natural, the magnitude and diversity of today’s threats have influenced the federal government and other organizations to create regulatory codes for mass notification and emergency communication systems, including voice intelligibility requirements for these life safety systems to be effective. International, European and North American fire alarm codes now require that voice evacuation systems meet minimum levels of speech intelligibility. Evolution of MNS