The Perceived Urgency of Speech Warnings: Semantics versus Acoustics

Elizabeth Hellier · Judy Reed Edworthy · Ben Weedon · Austin S. Adams

109 citations0/0 files storedHuman Factors The Journal of the Human Factors and Ergonomics Society

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Phonetics and Phonology Research Speech Recognition and Synthesis Safety Warnings and Signage

Abstract

The relationship between the semantics of words and the acoustics of the way they are spoken is explored. Actors spoke warning signal words in an urgent, nonurgent and monotone style, and participants rated the urgency of the words. Results showed effects for signal word and style of presentation. Acoustic analysis showed that the urgent words were spoken at higher frequency with a broader pitch range and were louder than the nonurgent or monotone words. These acoustic differences were used to synthesize artificial versions of signal words in urgent and nonurgent formats. The urgent words were rated as more urgent than the nonurgent words, a finding attributable to their differing acoustics. Within each speaking style the words were acoustically the same, yet effects for signal word were found, suggesting that semantics is also important in urgency perception. This research has implications for the design and implementation of speech warning systems, particularly those in which urgency mapping is required.

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