The Effect of Reverberation Time and Signal-to-Noise Ratio On Word Recognition Scores By Adults and Children in Classrooms

Volume: 19 Issue: 1
Year: 2024

Current Issue Published Issues Most Accessed Articles Ahead of Print

Index and Coverage

Avery Index

DOAJ

EBSCO

Erih Plus

ESCI � Clarivate

GALE Cengage

Genamics

ProQuest

TR Dizin

TUBITAK Ulakbim

Ulrichs Web

The Effect of Reverberation Time and Signal-to-Noise Ratio On Word Recognition Scores By Adults and Children in Classrooms [Megaron]

Megaron. 2019; 14(3): 385-396 | DOI: 10.14744/megaron.2019.94809

The Effect of Reverberation Time and Signal-to-Noise Ratio On Word Recognition Scores By Adults and Children in Classrooms

Konca Saher¹, Baki Karab�ce²
¹Department of Interior Architecture And Environmental Design, Kadir Has University Faculty of Architecture, �stanbul, Turkey
²TUBITAK UME, National Metrology Institute, Gebze-Kocaeli, Turkey

This paper seeks to assess the effect of reverberation time, distribution of reverberation time over the frequency range and signal-to-noise ratio on speech intellibility by adults and children in classrooms by the use of phonetically balanced monosyllabic Turkish word recognition tests. Two sets of 25-items phonetically balanced monosyllabic Turkish words were recorded in a full anechoic chamber. Auralizations of the recordings were developed in an acoustic simulation software for a range of reverberation time of 0,8 seconds (average of 500 Hz, 1000 Hz ve 2000 Hz), 0,4 seconds (average of 500 Hz, 1000 Hz ve 2000 Hz) and 0,4 seconds (125�4000 Hz) and two signal-to-noise ratios of 0 dB and 15dB in a typical classroom. Listening tests developed from auralizations were presented to adults and children. The results show that when reverberation time (average of 500 Hz, 1000 Hz ve 2000 Hz) is reduced from 0.8 seconds to 0.4 seconds for both signal-to-noise ratios of 0 dB and 15 dB, the percentage of speech recognition scores increases in both adults and children. However, in case of 0 dB signal-to-noise, when the reverberation time falls from 0.4 seconds (average of 500 Hz, 1000 Hz ve 2000 Hz) to 0.4 seconds (125�4000 Hz) while there is no significant improvement in the word recognition scores by adults, there is a significant improvement in childrens� scores. For the 15 dB signal-to-noise ratio case, reverberation time of 0,4 seconds (125 - 4000 Hz) does not have a notable impact on word recognition scores for both children and adults.

Keywords: Classroom acoustics, auralizations; word recognition score; signal-to-noise ratio; speech tests; Turkish monosyllabic words.

Dersliklerde Reverberasyon S�resi ve G�r�lt�-Sinyal Oran�n�n Yeti�kinler ve �ocuklarda Kelime Ay�rt Etme Oran�na Etkisi

Konca Saher¹, Baki Karab�ce²
¹Kadir Has �niversitesi Mimarl�k Fak�ltesi, �� Mimarl�k ve �evre Tasar�m� B�l�m�, �stanbul
²T�B�TAK UME, Ulusal Metroloji Enstit�s�, Kocaeli

Bu makale, s�n�flarda yeti�kinler ve �ocuklar i�in reverberasyon s�resi de�erlerinin, reverberasyon s�resinin frekans aral�klar�ndaki da��l�m�n�n ve sinyal-g�r�lt� oran�n�n konu�man�n anla��labilirli�ine olan etkisini T�rk�e fonetik dengeli tek heceli kelime ay�rt etme testleriyle belirlemeyi ama�lamaktad�r. �ncelikle, her biri 25 ��eden olu�an 2 tak�m fonetik dengeli tek heceli T�rk�e kelime tam yans�mas�z bir odada kaydedildi. Kay�tlar�n i�itselle�tirmeleri akustik bir sim�lasyon yaz�l�m�nda tipik bir s�n�f i�in 0,8 saniye (500 Hz, 1000 Hz ve 2000 Hz ortalamas�), 0,4 saniye (500 Hz, 1000 Hz ve 2000 Hz ortalamas�) ve 0,4 saniye (125�4000 Hz) olmak �zere �� farkl� reverberasyon s�resi ve iki farkl� sinyal-g�r�lt� oran� (0 dB ve 15 dB) i�in geli�tirildi. �� farkl� reverberasyon s�resi ve iki farkl� sinyal-g�r�lt� oran�na sahip alt� modeldeki i�itselle�tirmelerden geli�tirilen dinleme testleri, normal i�itme yetene�ine sahip gen� yeti�kinlere ve �ocuklara dinletildi. Sonu�lar, 0 dB ve 15 dB olarak her iki sinyal-g�r�lt� oran� i�in reverberasyon s�resi 500 Hz, 1000 Hz ve 2000 Hz ortalamas� olarak 0,8 saniyeden 0,4 saniyeye d��t�� zaman, konu�may� ay�rt etme y�zdelerinin yeti�kinlerde de �ocuklarda da artt��n� g�stermektedir. Ancak 0 dB sinyal-g�r�lt� durumunda reverberasyon s�resi 500 Hz, 1000 Hz ve 2000 Hz ortalamas� olarak 0,4 saniyeden 125 Hz � 4000 Hz oktav bantlar�n�n her birinde 0,4 saniye civar�na d��t�� zaman yeti�kinlerin konu�may� ay�rt etme oran�nda kayde de�er bir iyile�me olmazken, �ocuklar�n kelime ay�rt etme oranlar�n�n �nemli derecede artt�� g�zlemlenmi�tir. 15 dB sinyal-g�r�lt� oran� i�in ise 125 Hz � 4000 Hz oktav bantlar�n�n her birinde 0,4 saniye elde edildi�i durumun yeti�kinlerde de �ocuklarda da konu�ma anla��labilirli�ine �nemli bir etkisi g�r�lmemektedir.

Anahtar Kelimeler: Derslik akusti�i, i�itselle�tirme; konu�may� ay�rt etme oran�; sinyal-g�r�lt� oran�; s�ylem testi; T�rk�e tek heceli kelimeler.

Konca Saher, Baki Karab�ce. The Effect of Reverberation Time and Signal-to-Noise Ratio On Word Recognition Scores By Adults and Children in Classrooms. Megaron. 2019; 14(3): 385-396

Corresponding Author: Konca Saher, T�rkiye

TOOLS

Full Text PDF

Download citation

RIS

EndNote

BibTex

Medlars

Procite

Reference Manager

Share with email

Send email to author

Similar articles

PubMed

Google Scholar