Performance of hearing aids with an induction loop amplification system: laboratory versus classroom setting

Area of Science:

• Audiology
• Acoustics
• Hearing Aid Technology

Background:

• Hearing aids are crucial for individuals with hearing loss.
• Induction loop amplification (ILA) systems are commonly used in public spaces and classrooms to improve hearing aid performance.
• The acoustic performance of hearing aids can be influenced by the characteristics of the ILA system.

Purpose of the Study:

• To investigate the acoustic response of ten body-type hearing aids when used with an ILA system.
• To compare the performance of hearing aids with ILA systems in a laboratory setting versus a real-world classroom environment.
• To identify any frequency response issues with the classroom ILA system.

Main Methods:

• Ten body-type hearing aids were tested.
• Acoustic measurements were conducted in both a laboratory setting and an actual classroom.
• The performance of the hearing aids was evaluated when used in conjunction with an induction loop amplification (ILA) system.

Main Results:

• Undesirable frequency response characteristics were observed in the classroom ILA system.
• The classroom ILA system exhibited poorer low-frequency response.
• A significant notch in the frequency response was detected at approximately 2,500 Hz in the classroom ILA system.

Conclusions:

• The frequency response of the classroom ILA system significantly impacted the acoustic measurements.
• Differences between laboratory and classroom measurements would have been reduced with a flat frequency response from the ILA system.
• Measuring the operating characteristics of ILA systems directly in the classroom is a practical and valid approach.