Hung Tran Quoc's research while affiliated with Université de Montréal and other places

Publications (12)

Article
An efficient use of warning signals in noisy workplaces is submitted to many psychoacoustic and physic constraints, particularly when the security of the workers is concerned. Firstly, the use of warning signals in industry is not regulated. Secondly, the design of these signals is based on traditionnal pratices, with little consideration of the he...
Article
The acoustic response of head protectors was assessed by means of a mecano‐acoustic head simulator. The following protective devices were tested: welders’ mask, fire‐fighter helmet, aluminized hood, leather hood, sand‐blasting hood, dust protection hood, and emergency respirator. The tests were conducted in an hemi‐anechoic chamber with a wideband...
Article
Individual differences associated with equal-loudness contours for one-third-octave-bandwidth impulses, the centre frequencies of which varied from 1 to 8 kHz, have been determined. The psychophysical method of adjustment has been used. The measurements were performed at 74, 79, 84, 89 and 94 phons. A group of 10 male and 10 female subjects with no...
Article
This study was undertaken in order to document, in a group of subjects affected by a noise-induced hearing loss, the relation between the loss of auditory sensitivity and the loss of frequency selectivity at mid-frequencies, namely 1000 and 3000 Hz. Auditory filter shapes were estimated using the notched noise method. Twelve notch widths were teste...
Article
La mesure des filtres auditifs au moyen de la méthode proposée par Patterson et Nimmo-Smith [J.Acoust.Soc.Am. 1980,67,229-245] a été adaptée aux contraintes d'examen en clinique audiologique. Dans une perpective d'utilisation sur une grande échelle, des données normatives ont été recueillies auprès d'un d'échantillon important d'auditeurs normaux....
Article
Inspire de la méthode de mesure proposée par Patterson et Nimmo-Smith [J.Acoust. Soc. Am. 1980, 67, 229-245], le Groupe d'acoustique de l'université de Montréal a développé une procédure de mesure des filtres auditifs adaptée aux contraintes d'examen clinique. Afin d'en éprouver la validité, la prédiction des seuils de détection de sons purs en pré...
Article
Every year fatal injuries occur in noisy workplaces because a warning signal is not heard. Sound detection in competing noise is quite well documented, but there are very few practical tools allowing direct prediction of the ability to detect acoustic signals in varied noisy environments. The Groupe d'Acoustique de l'Université de Montréal has deve...
Article
A computerized model was developed to predict the detectability of warning sounds in noisy workplaces. A previous study with 23 subjects having different degrees of noise‐induced hearing loss allowed to quantify the relation between loss of auditory sensitivity and loss of frequency selectivity. This relation was then introduced into the model. Thi...
Article
The ability of annual audiometric surveillance to detect significant deteriorations in hearing sensitivity is examined considering the time pattern of the growth of noise-induced hearing loss. The yearly rate of change in hearing level due to the effects of noise exposure and age is computed from a mathematical model put forward in the Internationa...
Article
The Groupe d'Acoustique de I'Universite de Montreal (GAUM) has developped a computerized model ("Detectsound") for the detection of warning sounds by workers in noisy environments. The program was used to analyse 93 different configurations of warning signals in a steel plant. In more than half of the cases, the warning signals did not meet the rec...
Article
Groupe d'acoustique de l'université de Montréal, Montréal, Québec Dans le cadre de la mise au point d'une méthode clinique de mesure de la sélectivité fréquentielle, nous avons entrepris d'adapter la mesure des filtres auditifs aux contraintes de l'examen clinique. La procédure a été optimisée auprès d'auditeurs normaux et des données normatives on...

Citations

... In line with these recommendations, the lower and upper limit of the design window are respectively 12 and 25 dB above the masked detection threshold for the detection of the warning sound in the given noise field in frequencies ranging from 125 to 3150 Hz (Zheng et al. 2003). In ISO 7731, it is proposed that at least one spectral component should reach the design window (ISO 2003), but several authors have suggested that more than one component is required to account for the common fluctuations in background noise of many workplaces (Zheng et al. 2007;Laroche et al. 1999;Patterson 1990;Hung and H etu 1996;Hetu 1996). The advised number of spectral components required varies from three to four. ...
... The detectability of the DSD and ATP signal was estimated with the Detectsound software (Zheng et al. 2003) that has been developed to evaluate the efficacy of auditory warning signals in noisy workplaces (Laroche et al. 1991). Using this software, the detectability of acoustic warning signals in real-life conditions can be predicted. ...
... Mas o que são Protectores Individuais Auditivos? Poder-se-á dizer que são todos os equipamentos que constituem um obstáculo à propagação da onda sonora desde a sua fonte até ao ouvido humano.No entanto, dada a diversidade de formatos e de ambientes acústicos, a selecção dos protectores auditivos deverá ter em conta os seguintes aspectos:-o tipo de ruído a que se está exposto, como por exemplo, exposições a ruído contínuo ou exposições repetidas de curta duração(Hamernik et al., 1995;White et al., 1998a); -a existência de sons "úteis" ou informativos derivados do processo produtivo, como por exemplo, sinais sonoros de aviso(Liedtke, 1999); -a localização das fontes de ruído(Fortin et al., 1996); -as necessidades de comunicação verbal(Abel et al., 1982;Crabtree, 1998); -o ambiente térmico existente (Arezes, 2002); -a existência de poeiras ou contaminantes químicos (Arezes, 2002); -a incompatibilidade individual do utilizador (Arezes, 2002). No entanto, a atitude de muitos trabalhadores é que o uso de protecção auditiva altera a percepção auditiva (Wilkins e Martin, 1987). ...
... This software is designed to carry out notch-noise masking experiments, using an adaptative mixed-frequency Bekesy threshold search method. The procedure used was proposed by Hétu & Tran Quoc (1992) [22]. Participants were asked to press a response button when a pure-tone signal was heard through the notch-noise. ...
... Although some previous studies (e.g. Glasberg and Moore, 1986 ;Laroche et al., 1992 ) have suggested using a linear fit for thresholds beyond a mild hearing loss (i.e. using a ~30 dB inflection point to delineate normal vs. impaired frequency selectivity), the current data and others ( Dubno and Dirks, 1989 ;Shen et al., 2019 ) support an expo-nential relationship. This exponential relationship may not have been apparent in the former studies because the data were collected at one tone frequency (1 kHz) across many subjects without regard to the frequency of greatest impairment ( Glasberg and Moore, 1986 ;Laroche et al., 1992 ). ...
... Although audiometry is helpful to determine the efficacy of conservation programmes, concern has been expressed about its sole use to identify hearing damage as inner ear injury may occur before a hearing loss is detectable (LePage & Murray, 1993;Williams, 2005a). Furthermore, the likelihood of measuring a significant threshold shift using annual tests is small (Hetu, Tran Quoc & Dugay, 1990). This has encouraged the search for other tests of inner ear damage such as use of otoacoustic emissions (OAEs). ...
... Hearing loss imposes many burdens on workers, including communication difficulties, possible job loss, and stigma. Hearing loss may also increase risk of occupational injury because of inability to hear warning signals or shouts [25]. ...