HAC Hearing Aid Anatomy & Components Flashcards

What does the frequency response curve of a hearing aid represent?

Answer: The gain or output level the hearing aid provides at each frequency

The frequency response curve plots the gain or output sound pressure level provided by the hearing aid across the audible frequency range.

In a receiver-in-canal (RIC) hearing aid, where is the receiver physically located?

Answer: Inside the ear canal, connected to the BTE body by a thin wire

In a RIC hearing aid, the receiver (speaker) is placed in the ear canal and connected to the BTE processor body via a thin electrical wire.

What is a primary acoustic advantage of a RIC design over a traditional BTE with standard earmold tubing?

Answer: Reduced feedback risk and improved high-frequency amplification due to the receiver's proximity to the eardrum

Placing the receiver directly in the ear canal eliminates long acoustic tubing, reducing high-frequency roll-off and lowering the risk of feedback.

How is 'gain' defined in hearing aid specifications?

Answer: The difference between output SPL and input SPL at a given frequency

Gain equals output sound pressure level minus input sound pressure level, representing how much the hearing aid amplifies an incoming signal.

What is the function of acoustic tubing in a traditional behind-the-ear (BTE) hearing aid?

Answer: Conduct amplified sound from the receiver in the BTE body to the ear canal via the earmold

Acoustic tubing is the hollow plastic tube that carries amplified sound pressure from the BTE body's receiver to the earmold and into the ear canal.

What does the 'Full-on Gain' (FOG) measurement indicate about a hearing aid?

Answer: The maximum gain achievable with the volume control set to maximum

Full-on gain (FOG) is measured with the hearing aid's gain control at its maximum setting and represents the highest amplification the device is capable of producing.