SPAA 344 TERM 1 EXAM QUESTIONS WITH
DETAILED VERIFIED ANSWERS
parts on hearing aids
microphone, amplifier, receiver
microphone
Picks up sound, on outside of hearing aid
Every hearing aid has a microphone, some even have 2
Mic in the front is the actual mic and the one in the back is the directional mic
If it does not work, we cannot pick up sound
amplifier
Amplifies the sound in the hearing aid
receiver
Where the sound comes out of the speaker, If it does not work, we cannot produce sound
Intermodulation
Multiple frequencies causing problems
500 and 300 Hz>-----
> 500, 300, 200, 800, 600, 1000 Hz
Harmonic
Frequency specific
500 Hz>-------
>500, 1000, 1500, 2000 Hz
Impact of each of these types of distortion on speech discrimination
Causes hearing aid to make unwanted sounds and difficulties with speech discrimination
Body
, Used in third world countries, we dont use
BTE
Located behind the ear, has a hook that attaches to the ear mold
Used with ears with medical problems (curved ear canal, microtia, constant drainage, open
perforation, with any fluid coming out, cauliflower ear
Superpower BTE- most powerful
RIC-receiver in canal, all in the ear canal open BTE
Thin tube BTE_ open BTE, not in the ear, little as possible in the canal, less power due to sound
escaping
RICS and thin tubes - don't plug you up or make an echo sound, keeps the ear canal as open as
possible
advantages of BTE
Advantages: can be fit to any motivated HI person, has a lot of flexibility with features, great
gain and MPO than smaller aids, Tcoil is stronger, only the ear molds needs to be replaced over
time, DAI if available, suitable for ears with medical problems
disadvantage of BTE
more conspicuous than smaller aids, may fall off during work or recreation, may seem more
difficult to insert, remove, and a just volume control that a smaller hearing aid
ITE
Completely fill concha and ear canal
advantages of ITE
small and therefore more acceptable, better mic placement that BTE, more secure fit, easy to
insert and remove, and to adjust the volume
disadvantages of ITE
not generally a good option for children, Dont consider for kids until they are done maturing 10-
12 and their ears stop changing and growing
DETAILED VERIFIED ANSWERS
parts on hearing aids
microphone, amplifier, receiver
microphone
Picks up sound, on outside of hearing aid
Every hearing aid has a microphone, some even have 2
Mic in the front is the actual mic and the one in the back is the directional mic
If it does not work, we cannot pick up sound
amplifier
Amplifies the sound in the hearing aid
receiver
Where the sound comes out of the speaker, If it does not work, we cannot produce sound
Intermodulation
Multiple frequencies causing problems
500 and 300 Hz>-----
> 500, 300, 200, 800, 600, 1000 Hz
Harmonic
Frequency specific
500 Hz>-------
>500, 1000, 1500, 2000 Hz
Impact of each of these types of distortion on speech discrimination
Causes hearing aid to make unwanted sounds and difficulties with speech discrimination
Body
, Used in third world countries, we dont use
BTE
Located behind the ear, has a hook that attaches to the ear mold
Used with ears with medical problems (curved ear canal, microtia, constant drainage, open
perforation, with any fluid coming out, cauliflower ear
Superpower BTE- most powerful
RIC-receiver in canal, all in the ear canal open BTE
Thin tube BTE_ open BTE, not in the ear, little as possible in the canal, less power due to sound
escaping
RICS and thin tubes - don't plug you up or make an echo sound, keeps the ear canal as open as
possible
advantages of BTE
Advantages: can be fit to any motivated HI person, has a lot of flexibility with features, great
gain and MPO than smaller aids, Tcoil is stronger, only the ear molds needs to be replaced over
time, DAI if available, suitable for ears with medical problems
disadvantage of BTE
more conspicuous than smaller aids, may fall off during work or recreation, may seem more
difficult to insert, remove, and a just volume control that a smaller hearing aid
ITE
Completely fill concha and ear canal
advantages of ITE
small and therefore more acceptable, better mic placement that BTE, more secure fit, easy to
insert and remove, and to adjust the volume
disadvantages of ITE
not generally a good option for children, Dont consider for kids until they are done maturing 10-
12 and their ears stop changing and growing
