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Auditory and Vestibular Research، جلد ۲۴، شماره ۱، صفحات ۴۲-۵۰
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عنوان انگلیسی Gain measurement from two methods of NAL- NL2 and DSLm[i/o], using two Persian fricative consonants in coupler
چکیده انگلیسی مقاله Background and Aim: As the most perceived and articulated errors of hearing aid users occur in high frequency speech phonemes, this study aimed to find a way to amplify and reconstruct the errors. Thus, the study first prepared a recorded form of two Persian fricative consonants as stimulus; then, the rate of the prescribed gain of the two methods of National Acoustic Laboratories-Nonlinear 2 (NAL-NL2) and the Desired Sensation Level Multistage Input/Output (DSLm[i/o]) were compared. Methods: This study was performed using eight programmed hearing aids for severe sensorineural hearing loss in three configurations: flat, raising, and sloping. After fitting the hearing aids upon the NAL-NL2 and DSLm[i/o] methods, the rate of their gain for the consonants of /s/ and /f/, using Affinity 2.0 analyzer, was determined in 2 cc coupler at the three different levels.  Results: In the flat and raising audiograms, the prescribed gain of DSLm[i/o] for the two consonants in all three speakers and intensity level was more than NAL-NL2 (p< 0.05). In the sloping audiogram, the significance of the difference of prescribed gain of these methods disappeared; however, the DSL m[i/o] in the low frequency area was higher than NAL-NL2 (p< 0.001). Conclusion: The average prescribed gain of methods in the three frequency regions for the two consonants is different, and the prescribed gain of DSLm[i/o] in all frequencies, especially in the low frequency areas, is higher than NAL-NL2.
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نویسندگان مقاله | Marjan Soleimani
Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran


| Seyyed Jalal Sameni
Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran


| Farhad Torabi Nezhad
Department of Speech Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran


| Yahya Modarresi
Department of Linguistics, Institute for Humanities and Cultural Studies, Tehran, Iran


| Mohammad Kamali
Department of Rehabilitation Management, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
نشانی اینترنتی http://avr.tums.ac.ir/index.php/avr/article/view/17
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