Performance of new hearing aids using the ANSI S3.22-1976 standard

Area of Science:

• Audiology
• Hearing Aid Technology
• Acoustics

Background:

• Hearing aids are crucial assistive devices for individuals with hearing loss.
• Compliance with established standards like ANSI S3.22-1976 is vital for ensuring hearing aid quality and performance.
• Variability in test equipment accuracy can impact the assessment of hearing aid compliance.

Purpose of the Study:

• To evaluate the compliance of new hearing aids with ANSI S3.22-1976 specifications.
• To assess the impact of test equipment accuracy on hearing aid compliance results.
• To compare the performance across different types of hearing aid technologies.

Main Methods:

• One hundred new hearing aids from thirty-four models and eight manufacturers were tested.
• Measurements were conducted according to ANSI S3.22-1976 specifications.
• Test equipment accuracy estimates were incorporated to correct measurement tolerances.

Main Results:

• When test equipment accuracy was accounted for, 68% of hearing aids met all ANSI S3.22-1976 specifications.
• Excluding equipment accuracy corrections resulted in 11% fewer hearing aids passing all tests.
• Performance differences between hearing aid types (e.g., AGC, directional, linear) were within 10%.

Conclusions:

• Accurate calibration of test equipment is essential for reliable hearing aid compliance testing.
• The majority of tested hearing aids met performance standards when accounting for measurement accuracy.
• Different hearing aid technologies exhibit comparable performance within the tested specifications.