Using Group Amplification in the Classroom

11/19/99


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Table of Contents

Using Group Amplification in the Classroom

I. Benefits of Using FM Systems and Sound Field Systems in the Classroom

Basic Rationale

A Signal to Noise Ratio

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Advantages of FM Systems

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Advantages of Sound Field Systems

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II. Speech Acoustics

The average conversation level is 40-80 dB HL. To better understand that range, take a look at loudness levels of common sounds.

Just as these different environmental sounds have varying loudness levels, so do individual sounds of our language.

However, not only do sounds of the English language vary by loudness, they also vary according to pitch.

These varying levels of loudness and pitch in the English language affect the child with a hearing impairment’s ability to hear and understand all of the speech signal being presented.

Varying Degrees of Hearing Loss and the Effects on Understanding Language and Speech

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One can see from the previous examples, the importance of improving the signal to noise ratio for children with varying degrees of hearing loss to improve their academic performance and social functioning in the classroom.

III. FM Auditory Training Systems

Standard Parts of FM Systems

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Types of Individual FM Systems

FM Transmitter Options

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FM Receiver Options

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FM Battery Options

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Ideal Transmitter

Ideal Receiver

Ideal Battery

Sound Field FM Systems

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IV. Room Acoustics

Things that affect room acoustics

Room Noise

Factors that cause room noise

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Measuring Noise

Studies have been done to measure noise in decibels for activities occurring in representative classrooms in Dallas and Chicago areas.

Ways to Reduce Classroom Noise

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Reverberation

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Reverberation time can be measured using a reverberation meter or calculated manually by using measurements of the classroom and absorption coefficients from a table.

Important Things to Think About When Choosing a Classroom for Hearing Impaired Children

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Effects of Reverberation on Understanding Speech

Ways to Reduce Reverberation Time

In a classroom with no absorption or attempt to reduce reverberation, the reverberation time is about 1.65 seconds.

Distance

V. Daily Inspections of FM Systems in the Classrooms

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VI. Motivating Students

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VII. Resources for Teachers

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Author: Pamela Schlitt, Ana Paula Souza, Sabrina Strudwick

Email: thib@utdallas.edu

Home Page: http://www.utdallas.edu/~thib

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