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Influence of noise on children’s sense of hearing

Kaczorowski Adam, Komasa Maria

Vibrations in Physical Systems

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2019

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Vol. 30, nr 1

art. no. 2019124

EN

Children are at risk of developing hearing problems due to their exposure to high sound pressure levels for excessive amounts of time. The aim of this project was to establish the relationship between sound levels in the most hazardous fields and their effect on children’s sense of hearing. Measuring sound pressure levels in schools, analysing earphone and headphone usage and comparing them to audiometry results enabled basic dependencies to be found. Some of the examined children fall outside the safe exposure times to certain sound pressure levels (according to WHO directives). The results analysed in frequency bands show that there is a clear correlation between a shift in hearing threshold and intensity levels in music. Noise during lessons is not very high, but the noise during breaks and of bell rings can influence children’s’ hearing to a certain extent. Due to improper usage of earphones and headphones, the young people we examined may develop hearing loss at an early age.

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Preliminary Study on the Influence of Headphones for Listening Music on Hearing Loss of Young People

Dobrucki A. B., Kin M. J., Kruk B.

Archives of Acoustics

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2013

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Vol. 38, No. 3

383--387

EN

The paper presents results of hearing loss measurements provided for 81 young people (from 16 to 25 years old). The main aim of the work was to find the influence of headphones of the types used (closed, semi-open, open and in-ear) on the hearing losses. The first part of the research was to answer questions about the influence of: time of listening, loudness of music, other noise exposures as well as the type of the headphones used. It turned out that all factors mentioned above influence thresholds of hearing but the found dependencies are not explicit. The greatest hearing losses were observed for people who work as sound reinforcement engineers and, moreover, no influence of the headphone types was found for them. It turned out that the use of in-ear headphones causes the greatest hearing losses for some subjects (thresholds shifted up to about 20 dB HL at 4 kHz). The daily time of a listening also affected the hearing thresholds. It was found that for users of in-ear and close headphones, an average time of musical exposure of three hours causes the hearing loss of 10-15 dB HL at higher frequencies. The use of open as well as semi-open headphones has no influence on the hearing damage. Thus it would be stated that these kinds are safety in use. Almost 15% of the investigated young people have their thresholds shifted up at higher frequencies, particularly at 4 kHz, which means that they have the first symptoms of a permanent hearing damage.

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HRTF Adjustments with Audio Quality Assessments

Yao S. N., Chen L. J.

Archives of Acoustics

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2013

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Vol. 38, No. 1

55--62

EN

There are an increasing number of binaural systems embedded with head-related transfer functions (HRTFs), so listeners can experience virtual environments via conventional stereo loudspeakers or head- phones. As HRTFs vary from person to person, it is difficult to select appropriated HRTFs from already existing databases for users. Once the HRTFs in a binaural audio device hardly match the real ones of the users, poor localization happens especially on the cone of confusion. The most accurate way to obtain personalized HRTFs might be doing practical measurements. It is, however, expensive and time consuming. Modifying non-individualized HRTFs may be an effort-saving way, though the modifications are always accompanied by undesired audio distortion. This paper proposes a flexible HRTF adjustment system for users to define their own HRTFs. Also, the system can keep sounds from suffering intolerable distortion based on an objective measurement tool for evaluating the quality of processed audio.