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Aalborg Universitet Analysis of DPOAE fine structure of 12 symphony orchestra musicians Reuter Andersen, Karen; Ordoñez Pizarro, Rodrigo Eduardo; Hammershøi, Dorte Publication date: 2005 Document Version Publisher's PDF, also known as Version of record Link to publication from Aalborg University Citation for published version (APA): Reuter, K., Ordonez, R., & Hammershøi, D. (2005). Analysis of DPOAE fine structure of 12 symphony orchestra musicians. Poster session presented at European Congress "Hearing@Work", Amsterdam, Netherlands. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research. ? You may not further distribute the material or use it for any profit-making activity or commercial gain ? You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us at [email protected] providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from vbn.aau.dk on: September 18, 2016 Analysis of DPOAE fine structure of 12 symphony orchestra musicians K. Reuter, R. Ordoñez and D. Hammershøi Department of Acoustics, Aalborg University, Fredrik Bajers Vej 7 B5, 9220 Aalborg Øst, Denmark When distortion product otoacoustic emissions (DPOAE) are measured with a high frequency resolution, the DPOAE fine structure is revealed. It is characterized by consistent maxima and minima with notches of up to 20 dB depth (e.g. Heitmann et al., 1996). A similar fine structure is also known from the absolute hearing thresholds. It has been suggested by Mauermann et al., 1999 that it is the prevalence and character of the fine structure that best correlate with the state of the hearing. and after rehearsal in order to observe whether the exposure during the rehearsal causes temporary changes in the auditory system, e.g. a temporary threshold shift (TTS) or changes in the DPOAE fine structure. The DPOAE fine structure was systematically analyzed and characterized by the parameters ripple width, ripple height and ripple prevalence. Details about the automatic analysis procedure are described in Reuter & Hammershøi, 2005. The longterm aim of this study is to investigate whether DPOAE is a more sensitive measure to detect early hearing loss than the absolute hearing threshold. In a previous study the DPOAE fine structure of 50 young, normal-hearing subjects was analyzed according to the same analysis procedure (preliminarily reported in Reuter & Hammershøi, 2004). This gives the possibility to compare the fine structure characteristics of two different groups of subjects. This work was supported by the Oticon Foundation and the Danish Technical Research Council. Heimtann, J., Waldmann, B. & Plinkert, P.K. (1996). Eur Arch Otorhinolaryngol, 253, 167−171. Mauermann, M., Uppenkamp, S., Van Hengel, P. W. J. & Kollmeier, B. (1999). J. Acoust. Soc. Am., 106(6), 3484−3491. Reuter, K. & Hammershøi, D. (2005a). Proceedings of Inter-Noise, Rio de Janeiro, paper 1962 (7 pages). Reuter, K. & Hammershøi, D. (2005). Proceedings of Forum Acusticum, Budapest (4 pages). Reuter, K. & Hammershøi, D. (2004). Proceedings of Int. Conf. on Acoustics, Kyoto, Vol. I, 819−822 (4 pages). Figure 1. Examples of DPOAE fine structure for the left ear of three musicians before (solid line) and after (thin line) rehearsal. The grey line represents the measurement system’s estimation of the noise floor. In this study the DPOAE fine structure was measured for 12 symphony orchestra musicians before and after their rehearsal (preliminarily reported in Reuter & Hammershøi, 2005a). The purpose was to collect data of a group of subjects that is homogeneously exposed to relatively high levels of sound. The measurements were taken both before