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Probe-Tube Microphone Measures of Vent Effects With In-the-Canal Hearing Aid Shells.
American Journal of Audiology
|December 15, 2015
Summary
Venting in-the-canal (ITC) hearing aid shells affects acoustics. Larger vents reduce low frequencies and shift resonance, offering clinical options for ITC hearing aid frequency responses.
Area of Science:
- Audiology
- Acoustics
- Hearing Aid Technology
Background:
- In-the-canal (ITC) hearing aids are common assistive listening devices.
- Acoustic modifications of ITC shells can impact hearing aid performance.
- Venting is a key feature influencing the acoustic output of hearing aids.
Purpose of the Study:
- To investigate the acoustic effects of different vented ITC hearing aid shell configurations.
- To quantify the impact of vent size on sound pressure levels.
- To analyze changes in vent kneepoints and resonance frequencies.
Main Methods:
- Real-ear sound pressure level measurements were taken.
- Measurements were conducted in the frequency range of 200-2000 Hz.
- 12 adult subjects participated, using unvented and vented ITC shells.
Main Results:
- Increasing vent size led to greater low-frequency reduction.
- Larger vents caused an upward shift in vent kneepoints.
- Vent size influenced vent-associated resonance frequencies.
Conclusions:
- Venting significantly alters the acoustic properties of ITC hearing aids.
- Vent size is a critical factor in achieving desired low-frequency gain.
- Clinical application of venting can be used to tailor ITC hearing aid frequency responses.
