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Amplification systems: Hearing aids. May be analog or digital Consists of a microphone, amplifier, and loudspeaker. Earlier: Linear. Now, compressive with automatic gain control Directional microphones

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amplification systems hearing aids
Amplification systems: Hearing aids

May be analog or digital

Consists of a microphone, amplifier, and loudspeaker.

Earlier: Linear. Now, compressive with automatic gain control

Directional microphones

Different types of hearing aids: Body level, BTE, ITE, ITC, CIC, Bone-conduction, Eyeglass, disposable, CROS.

http://www.nidcd.nih.gov/health/hearing/hearingaid.htm#4

http://www.ahaanet.com/hearingaidstyles.asp

hearing aid characteristics
Hearing aid characteristics
  • OSPL
  • Gain:
    • Full on gain versus reference test gain
    • Functional gain versus insertion gain
  • Frequency response
  • Distortion
  • Battery drain, equivalent input noise level
implants
Implants

Bone-conduction implants

http://products.cochlearamericas.com/baha/introduction-to-baha-baha-and-natural-hearing

Middle ear implants

http://www.hearingcenteronline.com/newsletter/august00c.shtml

Auditory brainstem implants

http://www.earinstitute.org/news/facts/abifact.htm

cochlear implants
Cochlear implants

Direct stimulation of the auditory nerve

http://www.nidcd.nih.gov/health/hearing/coch.asp

http://www.mayoclinic.com/health/medical/IM02586

  • Consists of external and internal units.
    • External: Microphone that picks up acoustic signals, converts it to electrical signals and feeds it to a speech processor. Speech processor then delivers these coded signals to a transmitter, which converts it to magnetic impulses
    • Internal: Receiver and electrode array.

Candidacy issues: Age, hearing loss

issues in amplification
Issues in amplification

Candidacy: Should depend on individual’s specific needs.

Goal of amplification: To restore sensitivity, clarity (in quiet and noise) and to prevent amplification to intolerable levels.

Earlier: Comparative methods

Now: Prescriptive methods

Verification of hearing aid performance very important. Compensate for insertion loss. Real ear measures.

assistive listening devices
Assistive listening devices

Allows the signal to be closer to the amplification system.

Interface can be FM, infrared, or electromagnetic coupling .

Other types: For awareness. Example: Visual or vibrotactile devices.