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CD 443 Final Exam: Questions & Solutions (100% Correct)
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CD 443 Final Exam: Questions & Solutions (100% Correct)
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CD 443 Final Exam: Questions & Solutions (100%Correct)
Most ______ losses are medically or surgically treatable? Right Ans -
Conductive
What are some examples of conductive losses? Right Ans - - Cerumen
impaction
- Acute otitis media
- Perforated eardrum
Most sensorineural hearing losses are _____, not _____. Right Ans - Sensory,
neural
Those with permanent conductive HL do well with what? Right Ans - -
Hearing aids
- Bone conduction aids
What are the two most common causes of SNHL? Right Ans - - Problem in
cochlea
- Damage to OHCs
Degree of SNHL tends to be related to what? Right Ans - Amount of hair cell
damage
The greater the degree of hearing loss, the more likely what are involved?
Right Ans - BOTH outer and inner hair cells
How do hearing aids benefit those with SNHL? Right Ans - Amplifying the
signal overcomes the sensitivity loss due to hair cell damage
List the types of hearing aids. Right Ans - - Body-worn
- Behind-the-ear (BTE)
- In-the-ear (ITE)
- In-the-canal (ITC)
- Completely-in-canal (CIC)
- Bone conduction
, What is the main purpose of hearing aids? Right Ans - To improve speech
perception in noise
Open-fit technology hearing aids are excellent for what range of HL? Right
Ans - High-frequency
What are the 2 key ingredients to open-fit tech HAs? Right Ans - - Fitted to
ear with narrow tube
- Digital feedback cancellation
What are the 3 steps of how a hearing aid works? Right Ans - (1) Sound
picked up by microphone
(2) Signal amplified/processed
(3) Receiver converts to acoustic signal
What does the microphone do? Right Ans - Converts acoustic signal into an
electrical one
What does the receiver do? Right Ans - Converts electrical signal back to an
acoustic one
In a BTE HA, sound is delivered to the ear canal by what? Right Ans - The
ear mold
What are the 3 main types of processors/circuits? Right Ans - - Analog
- Digital
- Hybrid
How are characteristics adjusted in an analog HA? Right Ans - Screw
settings
How is sound processed in an analog HA? Right Ans - As a continuous
electrical signal (generated by the microphone)
How is the signal modified in an analog HA? Right Ans - Electronic
components
How are characteristics adjusted in a digital HA? Right Ans - Programmed
using specialized software
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