Atmospheric effects on voice command intelligibility from acoustic hail and warning devices

Jason H. Bostron, Timothy A. Brungart, Andrew R. Barnard, Timothy E. McDevitt

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Voice command sound pressure levels (SPLs) were recorded at distances up to 1500 m. Received SPLs were related to the meteorological condition during sound propagation and compared with the outdoor sound propagation standard ISO 9613-2. Intelligibility of received signals was calculated using ANSI S3.5. Intelligibility results for the present voice command indicate that meteorological condition imposes little to no effect on intelligibility when the signal-to-noise ratio (SNR) is low (-9 dB) or high (0 dB). In these two cases the signal is firmly unintelligible or intelligible, respectively. However, at moderate SNRs, variations in received SPL can cause a fully intelligible voice command to become unintelligible, depending on the meteorological condition along the sound propagation path. These changes in voice command intelligibility often occur on time scales as short as minutes during upward refracting conditions, typically found above ground during the day or upwind of a sound source. Reliably predicting the intelligibility of a voice command in a moderate SNR environment can be challenging due to the inherent variability imposed by sound propagation through the atmosphere.

Original languageEnglish (US)
Pages (from-to)2237-2244
Number of pages8
JournalJournal of the Acoustical Society of America
Volume129
Issue number4
DOIs
StatePublished - Apr 1 2011

Fingerprint

hail
atmospheric effects
intelligibility
warning systems
commands
sound propagation
sound pressure
acoustics
signal to noise ratios
Acoustics
Sound
Warning
Intelligibility
atmospheres
causes

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

Bostron, Jason H. ; Brungart, Timothy A. ; Barnard, Andrew R. ; McDevitt, Timothy E. / Atmospheric effects on voice command intelligibility from acoustic hail and warning devices. In: Journal of the Acoustical Society of America. 2011 ; Vol. 129, No. 4. pp. 2237-2244.
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Atmospheric effects on voice command intelligibility from acoustic hail and warning devices. / Bostron, Jason H.; Brungart, Timothy A.; Barnard, Andrew R.; McDevitt, Timothy E.

In: Journal of the Acoustical Society of America, Vol. 129, No. 4, 01.04.2011, p. 2237-2244.

Research output: Contribution to journalArticle

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