Application of free sorting tasks to sound quality experiments

International audienceIn many studies devoted to the sound quality of industrial products, a perceptual space is determined through dissimilarity judgements on pairs of stimuli. A drawback of this procedure is that it can be very time consuming if the number of stimuli is large. An alternative procedure consists in a free sorting of sounds: averaging individual results provides a set of data which are considered as indicators of dissimilarities and analyzed using a multi-dimensional scaling method. The validity of this alternative can be discussed, as the psychological processes involved in the two procedures are different. This study compared these two approaches in a particular case (door closure sounds). In this specific case, it was observed that dissimilarities obtained from the two procedures can be different, the more so as sounds are dissimilar and these differences can lead to slightly different perceptual spaces. Nevertheless, a free sorting experiment is a reliable way of reducing the number of stimuli in a large set of sounds. It allows selecting some representative sounds and narrowing the set of sounds while keeping in the subset most of the timbre features. This provides a useful preliminary step to a paired-comparison experiment

Influence of Train Colour on Loudness Judgments

International audienceThis study replicates an experiment described by Patsouras et al. [5] or Rader et al. [8] in which subjects had to evaluate the loudness of a passing-by train noise while watching pictures of the train, the colour of which being varied. In contrast to these studies, no influence of train colour on loudness evaluation could be found. This discrepancy might be due to cultural differences (French subjects vs. German or Japanese ones). But a more realistic reason can be a jury sampling effect, as this influence can exist for very few subjects (one among twenty-two in this experiment)

Categorisation: a useful tool for applied perceptive studies

6 pagesInternational audienceCategorisation is a very common way we perceive our sound environment and, as so, was widely studied. Nevertheless, categorisation experiments are not so often used in applied studies. The goal of this paper is to show that it can be a very useful tool for reducing the number of stimuli without any loss of the generality of the context. That was checked in two cases : the first one dealt with door closing sounds. A large number of stimuli (35) was reduced to twelve thanks to a categorisation experiment; these twelve stimuli could then be used in a similarity rating experiment, enabling to know the perceptual space of such sounds. The second case involved sound computed from a simple model in which some structural variabilities were used. In that case, the perceptual spaces derived from the categorisation experiment and the similarity ratings one were very close to each other

Méthodologie de la prosopographie à l’époque contemporaine

Programme de l’année 2011-2012 : I. Les sculpteurs de façades et ornemanistes au xixe s. — II. L’exposition universelle de 1878

Méthodes de la prosopographie à l’époque contemporaine

Programme de l’année 2007-2008 : I. Les différentes spécialités de la sculpture de façades. — II. Notices prosopographiques sur les sculpteurs de façades et ornemanistes au xixe s

Méthodologie de la prosopographie à l’époque contemporaine

Programme de l’année 2008-2009 : I. Les sculpteurs de façades et ornemanistes au XIXe s. — II. Masques et mascarons à Paris. — III. Les expositions universelles. — IV. Émile Muller

Simulated transfer path accuracy vs. sound perception

International audienceThe use of numerical methods is becoming more and more common in industry design processes. However, to finely represent the physics of the problem, numerical models are always more complex and time consuming. In the meantime, sound perception is now a very important topic for car manufacturers, who try to predict sound quality during the development phase of the vehicle. It is therefore useful to get some ideas about how accurate a simulation should be in order to be used in sound quality applications. The goal of this paper is to understand the minimum accuracy of simulated transfer paths (TPs) required to give meaningful psychoacoustic results. A physical model is build and the associated Finite Element (FE) model is setup, validated and taken as reference. Then, some deteriorations of the FE model are introduced and a sensitivity analysis checks how those changes affect objective metrics associated to the TPs. Laslty, hearing tests are performed in order to understand how people percieve the differencies in the various simulated sounds

Méthodologie de la prosopographie à l’époque contemporaine

Programme de l’année 2008-2009 : I. Les sculpteurs de façades et ornemanistes au XIXe s. — II. Masques et mascarons à Paris. — III. Les expositions universelles. — IV. Émile Muller

Méthodologie de la prosopographie à l’époque contemporaine

Programme de l’année 2006-2007 : I. Sculpture et architecture. — II. Sources d’inspiration. — III. Notices prosopographiques sur les sculpteurs de façades et ornemanistes au xixe s

Méthodologie de la prosopographie à l’époque contemporaine

Programme de l’année 2006-2007 : I. Sculpture et architecture. — II. Sources d’inspiration. — III. Notices prosopographiques sur les sculpteurs de façades et ornemanistes au xixe s