Term
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Definition
advantage- a lot of power with minimal feedback
- large controls
Disadvantages-
cosmetics
cord problems |
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Term
| traditional behind the ear |
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Definition
advantages- ccosmestics
-powerful
disadvantages- micropphone on top of pinna
-prceived as old fashion
-occlusion |
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Term
|
Definition
advantage- cosmestic
-little or no occlusion
-same day fitting
disadvantages- do work for ppl with more than moderate hearing loss
- microphone on top of pinna |
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Term
|
Definition
several sizes: full, halfshell, in the canal, completly in the canal
advantages- mic in the ear canal
disadvantages- delicates
may be difficult to manipulate
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Term
|
Definition
-converts acoustic energy to electrical energy
-directional vs. omnidirectional
-single microphone vs. multiple microphone. |
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Term
| analog to digital converter(A/D) |
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Definition
| Changes electrical signal to numbers |
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Term
| digital signla processor (DSP) |
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Definition
| manipulates numbers to amplity/filter |
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Term
| digital analog to convertor |
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Definition
| changes numbes to electrical signal |
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Term
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Definition
| changes electrical energy to acoustic energy |
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Term
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Definition
| picks up electromagnetic energy |
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Term
|
Definition
sends sound into EAC
most hearing aids have custom earmolds:
-BTE/body aids- seperate custom earmolds, attaached to hearing aid with tubbing.
-ITE- custom earmold molded to components
open ear BTE- hearing aids do not have custom earmolds |
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Term
|
Definition
reduces occlusion effect
reduces low frequency amplification
allows person to hear unamplified sound |
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Term
|
Definition
putting a filter in the earmold, earhook or tubbing
smooths frequency response |
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Term
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Definition
| boosts high frequency amplification |
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Term
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Definition
| to make as much speech audible w/o ever becoming uncomfortably loud |
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Term
|
Definition
how a hearing aid cuts off from amplifying loud sounds
-traditionally done with either peak clipping or comression
-compressions is also used to automatixally vary amount of gain depending on input level. |
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Term
|
Definition
uses 2 CC coupler to attach hearing aid to micropphone.
-doesn't actually stimulate freq response of real ear
- can compare hearing aids response to the of spec sheet
-ANSI 3.22: standards for hearing aid measurement. |
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Term
|
Definition
sft probe tube places in EAC other end is attached to measuring microphone
- person seated near loudspeaker emitting calibrated sounds
-allows for xamination of how hearing aids function while it is on the user.
can enter the audiogram and see if hearing aid is meeting "targets" |
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Term
|
Definition
localization
-quality
- bunaural summation
-emilimnates head shadow
-speech preception in noise/reverberated
-avoids auditory deprivation
* DONT reccommend binuaral hearing aids to
-mild hearing loss
-"dead ear"
-cost
-unilateral hearing loss |
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Term
|
Definition
used when someone has "dead ear" and
-a normal hear (cros)
-an audible ear (BiCros)
(avoids head shadow) |
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Term
| bone conduction hearing aids |
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Definition
| used when ear cannot accomidate an earmold |
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Term
| implantable bone conduction hearing aid (baha) |
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Definition
| used when ear cannot accomidate an earmold or w/ unilateral hearing loss |
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Term
|
Definition
based on prescriptive formula
-uses audiometric information (esp thresholds) to figure out amount of amplification at various frequencies and maximum output |
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Term
| hearing aid fitting/orientation |
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Definition
fitting:- physical fit of earmolf/ hearing aid checked
-Hearing aid programed
-real-ear measurement
- parts of hearing aid
-care and maintainence
-basic troubleshooting
-normal vs. abnormal
-battery type/size |
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Term
|
Definition
-insertion/ removal
-finding controls-
battery removal/ insertion
-getting use to hearing aid
-patient should be accompanied by a signifigant other
-for children, parents are main focus of orientation
-all material in writing |
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Term
|
Definition
with in first 30 days
-questions answered
-hearing aids re-programed if necessary.
-hearing aid verification
--real ear testing
--aided vs unaided testing
---functional gain
---speech understanding
-questionaires |
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