Investigation of Sound-Absorbing Material Configuration of a Smart Classroom Utilizing Computer Modeling

Abstract

Advancements in information and instruction technology have led to the evolution of a new type of classroom referred to as “smart classrooms”. These have enhanced audio-visual equipment, computers and seating layouts designed to facilitate interactive learning. Placement of different sound-absorbing finishes in an efficient manner improves the listening conditions within the classroom and reduces the amplification of internally generated noise such as that from computers and instructional equipment. This study investigates the best overall configuration of sound-absorbing material placement and characteristics of surface treatment in an attempt to enhance the listening conditions in smart classrooms. A typical layout of a smart classroom was modeled and simulated using room acoustics computer modeling. Acoustics indicators such as Reverberation Time (RT), Sound Clarity (C₅₀) and Speech Transmission Index (STI) were used for comparing alternative cases in optimising sound-absorbing material characteristics and placement. Additionally, measurements were conducted in similar classrooms to assess the magnitude and characteristics of generated noise. To determine the impact of the resulting background noise simulations were carried out. The resulting configuration of sound-absorbing material for a typical smart classroom can also be utilized by architects and educational institutions to enhance the acoustics of existing conventional classrooms in the process of being converted or upgraded.

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References

Bradley

J. S.

, “Speech Intelligibility Studies in Classrooms”, J. Acoustical Society of America , Vol. 80, No. 3, pp. 846–854, (1986).

Reich

, and Bradley

J. S.

, “Optimizing Classroom Acoustics Using Computer Model Studies”, Canadian Acoustics J. , Vol. 26, No. 4, pp. 15–21 (1998)

Bradley

, and Bistafa

S. R.

, “Predicting Reverberation Time in a Simulated Classroom”, J. Acoustical Society of America , Vol. 108, No. 4, pp. 1721–1731, (2000).

Hodgson

Rempel

, and Kennedy

, “Measurement and Prediction of Typical Speech and Background Noise Levels in University Classrooms during Lecture”, J. Acoustical Society of America , Vol. 105, No.1, pp. 226–233, (1999).

Hodgson

, “Experimental Investigation of Acoustical Characteristics of University Classrooms”, J. Acoustical Society of America , Vol. 106, No. 4, pp. 1810–1819, (1999).

Lubman

, and Sutherland

L. C.

, “Classroom Acoustics Issued”, FICAN Symposium on the Effect of Aircraft Noise on Children's Learning, San Deigo, CA, (2000).

Lubman

, and Sutherland

L.C.

, “Good Classroom Acoustics is a Good Investment”, 17th ICA, Rome, Italy, September 2–7, (2001).

Seep

Hulce

Linn

, and Who

P. A.

, “Classroom Acoustics, a resource for creating learning environment with desired listening conditions”, a publication of the technical committee on Architectural Acoustics of the Acoustical Society of America (2000).

American National Standard, “Acoustical Performance Criteria, Design Requirements and Guidelines for Schools”, Acoustical Society of America, ANSI S12-60-2002, (2002).

10.

Thomas

, “Smart E-classrooms, Traditional Classrooms and Critical Thinking”, World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education, AACE , Vol. 2002, Issue 1, pp. 2288–2291 (2002).

11.

Niemeyer

, “Guidelines for Active Learning Computer Classrooms”, College Classroom Consultant, 1390 Oak Boulder, CO 80304, E-mail, danielniemeyer@colorado.edu.

12.

Smart Classroom Information and Case Studies, www.classroom.com.

13.

Controls

S. P.

, www.spcontrols.com/applications.html.

14.

Lynge

, ODEON Room Acoustics Program, Industrial, Auditorium and Combined Edition, Version 5.02, Department of Acoustics Technology, Technical University of Denmark, http://www.dat.dtu.dk/∼odeon

15.

Rife

D. D.

, “MLSSA Maximum-Length Sequence System Analyzer”, Reference Manual Version 10.0A DRA Laboratory, 1987–96.

16.

ASHRAE Applications Handbook (SI), pp. 46. 23–46.25 (1999).