Hearing Aid Dispenser License (2024/2025) Questions with Correct Detailed Answers || Already Graded A+ <BRAND NEW VERSION>
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Course Hearing Aid
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Course Hearing Aid
Hearing Aid Dispenser License
(2024/2025) Questions with Correct
Detailed Answers || Already Graded
A+
<BRAND NEW VERSION>
Fourier Analysis - ANSWER A mathematical procedure by which any signal
can be separated into component sine waves at different frequencies. Combining
these si...
Hearing Aid Dispenser License
(2024/2025) Questions with Correct
Detailed Answers || Already Graded
A+
<BRAND NEW VERSION>
Fourier Analysis - ANSWER ✔ A mathematical procedure by which any signal
can be separated into component sine waves at different frequencies. Combining
these sine waves will reproduce the original signal.
Gain is calculated by... - ANSWER ✔ Output level minus input level
Is compression linear or non-linear - ANSWER ✔ Non-linear
Name the essential parts of a HA - ANSWER ✔ - One or more mics to convert
sound into an electrical signal
- An amplifier to increase the strength of the electrical signal
- A mini loudspeaker (receiver) to turn the electricity back to sound
- Means of coupling the sound source to the ear canal.
- A battery
How do directional microphones work? - ANSWER ✔ - Suppress noise coming
from on mic/port while retaining good sensitivity to the sound coming from
another direction.
Name some sensitivity pattern of a HA with directional mics enabled - ANSWER
✔ Cardioid (has a heart shaped pattern), super cardiod, hyper cardiod, figure 8
Why is distortion bad? - ANSWER ✔ Degrades intelligibility
, What are distortion products? - ANSWER ✔ - Areas that have been peak clipped
from the original sound signal.
Total Harmonic Distortion (THD) - ANSWER ✔ - Measurement of the harmonic
distortion present; Defined as the ratio of the sum of the powers of all harmonic
components to the power of the fundamental frequency.
What is a negative result of peak clipping? - ANSWER ✔ Distortion
What happens when a more complex sound is peak clipped? - ANSWER ✔ The
distortion product occurs at all harmonics of the frequency, which causes
intermodulation distortion.
What is an automatic gain control? - ANSWER ✔ A compression amplifier
high pass filter - ANSWER ✔ - Provides more gain in the high frequencies
- Can give a treble or shrill sound quality
low pass filter - ANSWER ✔ - Provides more gain to the low frequencies
- Can give a muffled or boomy sound quality
band pass filter - ANSWER ✔ Passes energy in a particular range of frequencies
band-stop filter - ANSWER ✔ reduces energy or attenuates energy within a
certain frequency band
Why a soft mold for a BTE for a child? - ANSWER ✔ - Children are active
- Soft molds are less likely to cause injury during play/activities
- Soft and flexible
- Less likely to feedback
Why not a soft mold for adults generally? - ANSWER ✔ - Soft materials
deteriorate faster over time
- Will need to replace hard mold much less.
, What problems can happen to the tubing/earmold due to a small ear canal
(infant/baby)? - ANSWER ✔ - Angle of tubing may cause HA to protrude.
Solution is to bend tubing at a sharper angle (use a hollow concha mold)
- It can be difficult to achieve even a 2mm sound bore, so tubing can become
pinched (can cause reduced high frequency gain and MPO). May need to do
additional drilling/pull tubing out a bit.
Why a 2cc coupler when doing test box measures? - ANSWER ✔ Chosen because
the value approximates the volume of a human adult ear canal past the ear mold
when a HA is worn.
Real Ear to Coupler Difference (RECD) - ANSWER ✔ - The difference between
the SPL a HA delivers to the ear canal and the SPL it delivers to the coupler.
- Takes individual ear characteristics in to account.
Real Ear Aided Gain (REAG) - ANSWER ✔ SPL near the eardrum minus the
SPL and some reference point outside of the head.
Take into consideration how the HA is processing sound in the free field and how
it is sending it into the ear.
Real Ear Insertion Gain (REIG) - ANSWER ✔ Tells us how much extra sound is
presented to the eardrum as a result of inserting the HA into the ear. Difference
between REUG and REAG
Three acoustic aspects of a coupling system - ANSWER ✔ - Sound bore
- Damping
- Venting
What frequency gain does vents affect? - ANSWER ✔ Low frequency gain and
OSPL 90 by allowing low frequency sounds out of the vent and allowing them in
before they reach the amplifier.
Above what HL do ppl complain of voices sounding boomy, echoey, hollow
approximately? - ANSWER ✔ Above 50 dB HL
What is an appropriate vent size to help with the occlusion effect? - ANSWER ✔
3-3.5mm
, Other names for a Y vent - ANSWER ✔ diagonal vent or angle vent
What problems do Y vents create? - ANSWER ✔ A Y vent often leads to high
frequency reflection at the Y junction, which causes
- decreased high frequency gain
- makes high frequency feedback more likely
What tubing to use? - ANSWER ✔ #13 double wall if available, or #13 standard
What do acoustic horns do? - ANSWER ✔ Increase the efficiency in which high
frequency power is transferred from the receiver to the ear canal. Increases the gain
and MPO in the high frequencies.
What frequency range do horns provide a boost to in BTEs vs ITEs - ANSWER ✔
BTEs- 3kHz and up
ITEs- 6kHz and up
due to length of the horn
What is a Libby horn? - ANSWER ✔ A molded plastic horn
What is the least amount of warranty time a HA dispenser must give their patient
for assistive devices? - ANSWER ✔ 30 days
What is the least amount of warranty time a HA dispenser must give their patient
for HAs? - ANSWER ✔ 45 days
Where does the warranty need to be specified? - ANSWER ✔ On the first page of
the contract in at least 10 pt. font
Who must sign off for a HA fitting for a child 16 years and younger? And within
what time frame? - ANSWER ✔ Otolaryngologist and audiologist. Within 6
months of the fitting.
What material for adults (most often)?
Advantages/disadvantages of this type... - ANSWER ✔ Acrylic (like lucite)
Advantages- little deterioration; easy to grind/modify; easier to insert; easy to
clean.
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