Group amplification in schools for the hearing impaired

Area of Science:

• Audiology
• Educational Technology
• Hearing Health

Background:

• Classroom acoustics significantly impact learning for hearing-impaired students.
• Group FM-wireless amplification systems are crucial for effective auditory access in specialized classrooms.
• Previous assessments of system functionality and performance in real-world educational settings are limited.

Purpose of the Study:

• To evaluate ambient noise levels in classrooms for the hearing impaired.
• To assess the functional status and electroacoustic performance of group FM-wireless amplification systems.
• To investigate the relationship between student hearing loss and system gain settings.

Main Methods:

• Field study conducted in 19 classrooms for hearing-impaired students.
• Measurement of ambient noise levels.
• Physical inspection of FM-wireless teacher and student amplification units.
• Electroacoustic performance testing of amplification systems.

Main Results:

• Ambient noise levels were found to be unacceptably high in most classrooms.
• Approximately 50% of the inspected amplification units (28 teacher, 89 student) exhibited defects.
• Significant variability in electroacoustic performance was observed across different systems.
• No clear correlation was found between the degree of children's hearing loss and the gain settings of their amplification units.

Conclusions:

• High ambient noise levels underscore the critical need for effective amplification in classrooms for the hearing impaired.
• Defective and poorly performing FM-wireless systems compromise the intended benefits of group amplification.
• The lack of systematic gain adjustment relative to hearing loss suggests potential issues with system management or user training.