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Hearing Aids

Aural Rehab Exam II

QuestionAnswer
Audibility What can be heard
Intelligibility What can be understood
Dynamic range - what they can hear from soft to loud - Can they hear it an understand it
Role of hearing aids - Amplify the auditory signal to make sound audible - May provide more intensity for signals of different frrequencies
Hearing Aid = Amplification system - Both acoustic and electrical components - consider the acoustic properties of the ear canal, unoccluded and occluded and the device
Air Conduction hearing aids - Analog - Digital - BTE - RIC - ITE - CIC
Analog - makes continuous sound waves louder - programmable - no longer available
Digital - latest generation - uses digital signal processing (DSP) on incoming signals
Behind-The-Ear (BTE) - Device behind the ear and an ear mold with tubing that connects them
Full Shell Provides the greatest acoustic seal
Half shell, skeleton, and canal styles fill less of the concha and provide less of a seal
Receiver in the Canal (RIC) most popular option
IN the ear (ITE) - for people with dexterity issues - profound losses - people with small ears can't use this
In the canal Is within the canal
Completely-in-canal (CIC) - large EC - need good dexterity - no good for wireless options
BTE vs RIC primary difference is where the speaker is located - BTE has a tube for sound from the speaker to the ear - RIC has a wire connecting the mic (behind the ear) to the speaker that is in the ear)
Features of hearing aids Programming: - Directionality - Compression -noise reduction - Frequency lowering - individual programs Connectivity: - FM - Bluetooth - T-coild induction -Auracast
Compression in relation to dynamic range of a person - hearing aid compress the sound
omnidirectional sounds form all directions for hearing equally. not good for background noise
Directional - Good for background noise - back to part you don't want to hear
Adaptive Directional mixed between omni and fixed direction. Scans where sounds come from to be able to give different directions
Feedback - Air conducted sound through microphone, feedback of amplified sound because it reaches the speaker
Frequency lowering shifts high frequency speech and sound information into a region that is audible
Multiple programs alternate settings that individuals can use when in various listening environments
Frequency moderation - handing the microphone to someone else
Telecoil an induction loop hearing aids but have this for it to work
auracast universal bluetooth
Single sided deafness (SSD) no hearing access in one ear and complete access in the other
Contralateral Routing of Sound (CROS) Candidacy: - Asymmetric hearing levels (with word recognition challenges) - Single-sided deafness Devices: - Two-piece hearing aid but ONLY ONE SIDE produces sound
Cochlear IMplant electrical stimulation
Bone anchored hearing system uses bond conduction to docnduct signal across the head
Bilateral Contralateral Routing of Sound (BiCROS) better hearing ear: amplification poorer hearing ear: transmitter to better ear
Personal Sound Amplification Product - moderate hearing levels - not used to treat hearing loss
Evaluation prior to HA selection - Pure tone ai and bone conduction thresholds - word recognition - Loudness discomfort levels - self-assessments - counseling
Prescriptive fitting an algorithm that makes decisions about how the hearing aid processes sound - includes compression, noise reduction, directionality, etc.
prescriptive fitting algorithms - proprietary - created by manufacturers - NAL- NL1 & NAL - NL2 - developed but he national acoustic laboratory - DSL (Desired Sensation Level)
Created by: Livy_Marolda
 

 



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