CH. 13 - Hearing Aids Flashcards
device that moves in response to pressure waves of sound and converts acoustic signal to electric signal
Microphone
device that boosts electrical signal of a microphone
amplifier
device that converts electrical signal to acoustic signal
loudspeaker or receiver
setup where microphone given to speaker, signal transmitted via signal to hearing aid
Remote-microphone system (RMS)
with this type of sound input, a hearing aid picks up electromagnetic signals directly
t-coil
what is this
t-coil neck loop
this type of remote mic input device sends low-power, short-range signals between devices using magnetic-field energy, often between hearing aids
NFMI (near-field magnetic induction)
what is this?
NFMI neck loop
These two remote mic input sources are inside the hearing aid, so no intermediary receiver needed
DM and BT
what does DM stand for RE sound input?
digitally modulated
what does BT stand for RE sound input?
Bluetooth
another name for a HA loudspeaker
receiver
two main types of hearing aids
in-the-ear and behind-the-ear
portion of ITE HA that faces outward
faceplate
four types of ITE H.A.s
FS
HS
ITC
CIC
RE hearing aids
what does FS stand for and what type of HA is it?
full-shell; ITE
RE hearing aids
what does HS stand for and what type of HA is it?
half-shell; ITE
RE hearing aids
what does ITC stand for and what type of HA is it?
in-the-canal; ITE
RE hearing aids
what does CITC stand for and what type of HA is it?
completely-in-the-canal; ITE
two subtypes of BTE hearing aids
standard/traditional; receiver-in-the-ear
RE hearing aids
what does RITE stand for and what type of HA is it?
receiver-in-the-ear; BTE
RE hearing aids
what does RIC stand for and what type of HA is it?
receiver-in-the-canal; BTE
process of a speaker having limits on the amount of intensity it can deliver
Output limiting
limit on how much gain can be added to input signal in a hearing aid
Maximum Power Output (MPO)
when amplified sound from loudspeaker directed back into mic
feedback
what is another term for an acoustic environment?
sound scene
name for the loss of some hearing because plugging the ear
Plugging ears
creating an opening in a hearing aid to lessen the effects of a plugged ear
venting
what are these?
bone conduction hearing aids
three main components of a hearing aid’s machinery
-Mic/other input sources
-Amplifier (gets power from battery)
Loudspeaker/receiver
directional HA usually have __ microphone(s)
2
Five types of remote mics
1) DAI
2) Telecoil
3) NFMI
4) DM
5) BT
what does DAI stand for?
direct audio input - type of remote mic input
what does t-coil stand for?
tele-coil
heart of the hearing aid
amplifier
this type of hearing aid has all of the components inside the outer ear
ITE
this type of hearing aid does not all of the components inside the outer ear
BTE
what kind of BTE is this?
RIC
what kind of BTE is this?
standard/conventional
which type of HA is most often chosen for pediatrics
BTE
a noncustom earplug that holds the receiver in a BTE
dome
phenomenon when you’re voice feels weird because your ears are plugged
occlusion effect
HEARING AIDS
The intensity of the incoming sound is called the __
input intensity
HEARING AIDS
The intensity of the sound produced from the HA is called the __
output intensity
HEARING AIDS
The amount that the sound is made louder by the HA is called the __
gain
HEARING AIDS
output - input =
gain
HEARING AIDS
input + gain =
output
process of programming a HA so there are different amount of gain at different frequencies to match HL configuration
Frequency-Gain Response of HA
HEARING AIDS
Same amount of gain applied to input signal regardless of original intensity
linear amplification
HEARING AIDS
Amount of gain HA gives depends on incoming intensity
nonlinear amplification
HEARING AIDS
linear amplification is better for ___ HL
conductive
HEARING AIDS
nonlinear amplification is better for ___ HL
sensorineural
HEARING AIDS
These are used to program hearing aids, and take into account freq’s at different ranges, gains as function of input, and capping intensity
prescriptive algorithms
one easy way to reduce feedback in HA
put mic and loudspeaker father apart
two ways modern hearing aids can compensate for background noise
1) directionality
2) noise reduction
these types of HA typically last longer
BTE
