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ERIC Number: EJ812579
Record Type: Journal
Publication Date: 2008-Oct
Pages: 10
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0161-1461
The Effect of Classroom Amplification on the Signal-to-Noise Ratio in Classrooms while Class Is in Session
Larsen, Jeffery B.; Blair, James C.
Language, Speech, and Hearing Services in Schools, v39 n4 p451-460 Oct 2008
Purpose: The purpose of this study was to measure the signal-to-noise ratios in classrooms while class was in session and students were interacting with the teacher and each other. Method: Measurements of noise and reverberation were collected for 5 different classrooms in 3 different schools while class was in session. Activities taking place during the measurements were recorded to compare with sound level measures. The use of infrared classroom amplification was compared with no amplification. Results/Conclusion: The results revealed that when classroom amplification was used, students heard the teacher's voice at a level that was an average of 13 dB above the noise floor as compared to an average of +2 dB above the noise floor without amplification.
American Speech-Language-Hearing Association (ASHA). 10801 Rockville Pike, Rockville, MD 20852. Tel: 800-638-8255; Fax: 301-571-0457; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A