Alert sound design considering musical-chord and frequency-sweep effects

Yukio Iwaya, Takuya Anbe, Zhenglie Cui, Yôiti Suzuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Because of the huge tsunami created by the gigantic earthquake of March 11, 2011, Japan's Tohoku District sustained widespread and severe damage. Reportedly, alert speech sounds from open- Air loudspeakers of governmental emergency radio communications systems were often not sufficiently intelligible because of the superposition of long-path echoes. A similarly huge tsunami is expected to occur about once every 1,000 years in this area, necessitating preparation for future tsunamis. Alert sounds are useful to convey specific alert signals using non-verbal sounds. Therefore, conditions to produce an alert sound that is tolerant to long-path echoes were investigated in this study, which examined musical chords for the design of alert sounds. To increase the saliency, we also applied an octave-up sweep from stationary chords. Subsequently, we investigated the influences of harmonic structure and sweeping characteristics so that an alert sound can have optimal alert impressions. The alert impression of the sounds, which consist of five tones and the fifth harmonic, was higher than those of single and second harmonic chords. That result indicates that open- Air loudspeaker systems to convey alert information must have a sufficiently broad frequency range.

Original languageEnglish
Title of host publication42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Subtitle of host publicationNoise Control for Quality of Life
PublisherOAL-Osterreichischer Arbeitsring fur Larmbekampfung
Pages4965-4969
Number of pages5
ISBN (Print)9781632662675
Publication statusPublished - 2013 Jan 1
Event42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria
Duration: 2013 Sep 152013 Sep 18

Publication series

Name42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life
Volume6

Other

Other42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013
CountryAustria
CityInnsbruck
Period13/9/1513/9/18

Keywords

  • Alert sounds
  • Frequency-sweep
  • Long-path echo
  • Musical chords
  • Open- Air loudspeaker tower systems

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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