Related Experiment Videos
Performance of assistive listening devices using insertion gain measures
A Baumfield1, L Hickson, B McPherson
1Department of Speech and Hearing, University of Queensland, Australia.
Scandinavian Audiology
|January 1, 1993
Summary
Seven assistive listening devices (ALDs) were tested for electroacoustic performance. Results showed varied performance across devices, with most offering limited amplification at lower volumes and acceptable distortion levels.
Area of Science:
- Audiology
- Biomedical Engineering
- Acoustics
Background:
- Assistive listening devices (ALDs) are crucial for individuals with hearing impairments.
- Many ALDs do not require coupling with a hearing aid, offering versatile solutions.
- Understanding the electroacoustic performance of these devices is essential for effective use.
Purpose of the Study:
- To evaluate the electroacoustic performance characteristics of seven distinct assistive listening devices (ALDs).
- To assess the real ear insertion gain provided by these ALDs across different settings.
- To compare the performance variations among different types of ALDs, including TV listening and personal amplification systems.
Main Methods:
- Real ear insertion gain measurements were performed on ten human subjects.
- Electroacoustic performance parameters, including frequency response and total harmonic distortion, were analyzed.
- ALDs were tested across various volume settings, particularly at or below half maximum volume.
Main Results:
- Significant variations in electroacoustic performance were observed among the tested ALDs.
- Frequency responses typically exhibited a flat or a low/mid-frequency emphasis.
- Most devices provided minimal amplification when set at or below half volume.
- Total harmonic distortion remained at 10% or less for the majority of the ALDs.
Conclusions:
- Real ear insertion gain is a valuable metric for assessing the effectiveness of ALDs.
- The performance variability highlights the need for careful selection of ALDs based on individual needs.
- Further research into optimizing ALD performance, especially at lower volume settings, is warranted.