Speech intelligibility and speech quality of modified loudspeaker announcements examined in a simulated aircraft cabin.

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Speech intelligibility and speech quality of modified loudspeaker announcements examined in a simulated aircraft cabin.

Ergonomics. 2014;57(12):1806-16

Authors: Pennig S, Quehl J, Wittkowski M

Abstract
Acoustic modifications of loudspeaker announcements were investigated in a simulated aircraft cabin to improve passengers' speech intelligibility and quality of communication in this specific setting. Four experiments with 278 participants in total were conducted in an acoustic laboratory using a standardised speech test and subjective rating scales. In experiments 1 and 2 the sound pressure level (SPL) of the announcements was varied (ranging from 70 to 85 dB(A)). Experiments 3 and 4 focused on frequency modification (octave bands) of the announcements. All studies used a background noise with the same SPL (74 dB(A)), but recorded at different seat positions in the aircraft cabin (front, rear). The results quantify speech intelligibility improvements with increasing signal-to-noise ratio and amplification of particular octave bands, especially the 2 kHz and the 4 kHz band. Thus, loudspeaker power in an aircraft cabin can be reduced by using appropriate filter settings in the loudspeaker system.

PMID: 25183056 [PubMed - indexed for MEDLINE]

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