HAC Earmold Selection & Hearing Aid Styles Flashcards

What is the occlusion effect in hearing aid fitting?

Answer: The perception of a hollow, booming quality in the user's own voice when the ear canal is occluded

The occlusion effect is the unnatural, low-pitched resonance patients hear in their own voice when bone-conducted vocal energy is trapped in an occluded ear canal.

What effect does increasing the vent diameter in an earmold have on the low-frequency response?

Answer: Reduces low-frequency gain and decreases the occlusion effect

A larger vent allows more low-frequency sound to bypass the hearing aid and escape from the canal, reducing low-frequency amplification and alleviating the occlusion effect.

What is a BiCROS hearing aid system?

Answer: A CROS system used when the better ear also has a hearing loss requiring amplification

BiCROS routes sound from the non-aidable ear to a hearing aid on the better ear, which also provides amplification for that ear's own hearing loss.

What is the purpose of earmold lubricant?

Answer: Ease insertion of the earmold into the ear canal by reducing friction

Earmold lubricant reduces friction between the earmold and ear canal wall, facilitating comfortable insertion especially for tight-fitting custom molds.

How does modern acoustic feedback suppression in hearing aids work?

Answer: A DSP algorithm detects the feedback signal and applies anti-phase cancellation in real time

Feedback suppression algorithms continuously monitor the signal, model the feedback path, and inject an anti-phase signal to cancel feedback without reducing overall amplification.

What is a primary cosmetic advantage of a slim-tube BTE over a traditional BTE with standard earmold tubing?

Answer: The very thin, nearly transparent tube makes the device far less visible than standard thick earmold tubing

The slim tube is much thinner and less conspicuous than traditional earmold tubing, making the overall fitting less visible while still delivering sound to the ear.