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
PPT Slide
Advantages of FM Systems
Advantages of Sound Field Systems
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
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
Types of Individual FM Systems
FM Transmitter Options
FM Receiver Options
FM Battery Options
Ideal Transmitter
Ideal Receiver
Ideal Battery
Sound Field FM Systems
IV. Room Acoustics
Things that affect room acoustics
Room Noise
Factors that cause room noise
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
Reverberation
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
VI. Motivating Students
VII. Resources for Teachers
Email: thib@utdallas.edu
Home Page: http://www.utdallas.edu/~thib
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