Zahra POLAT
(Türkiye Sağlık Bilimleri Üniversitesi, Hamidiye Sağlık Bilimleri Fakültesi, İstanbul, Türkiye)
Ahmet ATAŞ
(İstanbul Üniversitesi, Cerrahpaşa Tıp Fakültesi, Kulak Burun Boğaz Anabilim Dalı, İstanbul, Türkiye)
Yıl: 2020Cilt: 10Sayı: 2ISSN: 2146-6505 / 2147-1894Sayfa Aralığı: 155 - 159İngilizce

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Assessment of Speech Intelligibility in Free-field Sound Chamber at Different Signal Noise Ratios
Objective: In the presence of background noise, understanding speech is challenging for any listener, especially for those with serious hearing loss.This study aimed to determine speech intelligibility of normal-hearing adults in quiet and noisy free fields.Methods: This study included 77 volunteers with normal hearing aged between 18 and 30 years (mean: 22.25±2.7 years). Speech intelligibility scoreswere determined using the non-adaptive method at different signal-to-noise ratios (SNRs) and changing the noise direction (front and rear).Results: The mean ± standard deviation of the adaptive matrix speech reception threshold in quiet for 50% intelligibility was 22.69±3 dB soundpressure level. Speech intelligibility scores obtained at -10, -5, and 0 dB SNRs were significantly different when the noise was presented from the frontto rear direction (p<0.05). Better speech intelligibility scores were obtained when noise was presented from the rear.Conclusion: The standard audiometric test battery does not measure speech intelligibility in noisy environments. Therefore, speech intelligibility inthe noise test developed and normalized in the native language of the patient should be used in the evaluation. Because our study was conductedin free field, the results could be used in the evaluation of patients using cochlear implants and hearing aids in free field.
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