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Tuesday, July 9 • 12:10 - 12:30

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This paper focuses on the perception of three main signal components of aircraft sound: multiple pure tones (MPT), blade passing frequency (BPF) and broadband noise. The interaction between these components and their relative impact on noise annoyance still needs to be investigated. The experiment carried out in this study aims at understanding if MPT is a prominent perceptual factor when combined with BPF, and how MPT perceptual prominence changes when MPT and BPF are combined at different gain levels. To address this issue, we used a free sorting task (FST) protocol in which participants have to use their own similarity criteria in order to sort a set of sounds. FST is a simple procedure that allows to reveal the perceptual strategies of participants when they are exposed to a set of complex sounds. Its main advantage is to let the participants free to choose his/her sorting criteria, with very few guidance from the experimenter. From a theoretical point of view, this task is based on perceptual categorization, which is a natural cognitive process used in everyday life. Two sets of 15 sounds corresponding to two types of large aircraft were judged by 57 participants in an isolated sound booth. These data were analyzed using multivariate component analysis (MCA) to identify perceptual factors used by most of the participants to form their categories. Results showed that MPT was always more perceptually salient than BPF, and that BPF and MPT intensity differences were not relevant for the participants.


Stephen Keith

Research Scientist, Health Canada
ask me about employment opportunities for biligual acoustics management position at Health Canada - experience in environmental assessment beneficial

Martin Meunier



Tuesday July 9, 2019 12:10 - 12:30
Westmount 4 Hotel Bonaventure

Attendees (32)