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CSD 3000 DEAFNESS IN SOCIETY. Topic 8 HEARING AIDS AND ASSISTIVE TECHNOLOGY. Modern Hearing Aid Design. Miniturization Enhanced signal processing Multiple memories Noise reduction Feedback control Programmability Digital processing Multiple channels. Important Hearing Aid Components.

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csd 3000 deafness in society

CSD 3000DEAFNESS IN SOCIETY

Topic 8

HEARING AIDS AND ASSISTIVE TECHNOLOGY

modern hearing aid design
Modern Hearing Aid Design

Miniturization

Enhanced signal processing

  • Multiple memories
  • Noise reduction
  • Feedback control
  • Programmability
  • Digital processing
  • Multiple channels
important hearing aid components
Important Hearing Aid Components
  • Batteries

Sizes and materials

  • Microphones

Directional and omnidirectional

  • Amplifiers
  • Receivers

External air conduction, bone conduction, vibrotactile

other optional features
Other Optional Features
  • On/off switch
  • Telecoil
    • Separate circuit to use with a telephone receiver or an induction loop system
    • Reduces feedback and improves interference from background noise
  • Volume Control
  • Earmold
    • CD-ROM Ch.07.06 shows some examples of common earmold styles
    • CD-ROM Ch.07.07 shows a video example of taking an earmold impression
hearing aid fitting considerations
Hearing Aid Fitting Considerations

What does the audiologist consider when making the recommendation for amplification?

  • Hearing aid style
major hearing aid styles
Major Hearing Aid Styles
  • Body hearing aids
  • Eyeglass hearing aids
  • Behind the ear hearing aids
  • In the ear hearing aids
  • Completely in the canal hearing aids

CD-ROM Ch.07.01 illustrations of every angle of BTE, ITE, ITC, and CIC

body and eyeglass hearing aids
Body and Eyeglass Hearing Aids

Popular in the1950’s and 1960’s

  • CD-ROM Ch7.03 shows image of body hearing aid

Receiver is external

Needs an earmold

  • Advantages

High gain, no feedback, large controls

  • Disadvantages

Stigma, monaural fittings only,microphone placement

  • Eyeglass style

All components are internal but breakdown is common

behind the ear hearing aids
Behind the Ear Hearing Aids

All hearing aid components built into a case that fits behind the ear

Couples to the ear via earmold

  • CD-ROM Ch.07.04
  • Advantages
    • Flexibility
    • Good choice for kids
    • Compatibility with direct audio input
    • Good feedback control
    • Microphone placement
    • True binaural fittings
    • Durable
in the ear hearing aids
In the Ear Hearing Aids

All hearing aid components fit completely in the ear

CD-ROM Ch.07.05

Biggest advantage is customizing the hearing aid to the individual

completely in the canal hearing aids
Completely in the Canal Hearing Aids

All hearing aid components fit completely in the external canal

CD-ROM Ch.07.01

  • Advanages

Easy to use, Reduction of occlusion effect, Reduced feedback, Improved localization ability, Less gain needed, No wind noise, No cerumen problem, Easy use with phone, Invisible, Greater high frequency emphasis

  • Disadvantage

Size demands

hearing aid fitting considerations1
Hearing Aid Fitting Considerations

What does the audiologist consider when making the recommendation for amplification?

  • Hearing aid style
  • Level of technology
hearing aid technology
Hearing Aid Technology
  • Analog
    • Oldest form of signal processing
    • The signal is processed in a manner that is continuously varying over time
  • Programmable
    • Uses analog signal processing with digital control
  • Digital
    • Signal is digitized, manipulated, then converted back to analog form
hearing aid fitting considerations2
Hearing Aid Fitting Considerations

What does the audiologist consider when making the recommendation for amplification?

  • Hearing aid style
  • Level of technology
  • Monaural vs binaural fitting
advantages to binaural amplification
Advantages to Binaural Amplification
  • Localization
  • Binaural summation
  • Elimination of a bad side
  • Binaural squelch
  • Auditory deprivation

Koop video

other kinds of amplification devices
Other Kinds of Amplification Devices

Tactile hearing aids

  • Used by individuals who can’t benefit from traditional amplification
  • Delivers vibrotactile stimulation
  • Limited frequency resolution
  • Main advantage is as a supplement to visual and contextual cues
other kinds of amplification devices1
Other Kinds of Amplification Devices

Implantable hearing aids

  • Middle ear implants
  • Bone-anchored hearing aids
  • Cochlear implants
cochlear implants
Cochlear Implants

Internal components

  • Internal receiver
  • Electrode array
  • CD-ROM Ch.07.10

External components

  • Microphone
  • Connecting cables
  • Speech processor
  • Transmitter
  • CD-ROM Ch.07.08 shows first body worn speech processor
  • CD-ROM Ch. 07.09 is typical earlevel processor
what the major components do
What the Major Components Do..

Microphone

Speech processor

Transmitter

Electrode array

CD-ROM Ch.07.11 illustrates what the implant looks like worn

wireless amplification systems
Wireless Amplification Systems

Environmental factors that make speech understanding difficult

  • Reverberation
  • Background noise

CD ROM Ch.07.15 and Ch.07.16 illustrate typical listening conditions in a classroom

major types of wireless systems
Major Types of Wireless Systems

FM systems

  • Personal FM trainers
  • CD-ROM Ch. 07.12 shows an example
  • Soundfield FM systems

Infared systems

Induction loop systems

CD-ROM Ch.07.13 audio example