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Hearing Aid

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Hearing Aid

  • Types
  • Conventional analog Hearing Aids
  1. Cost: ~$900 per ear
  2. Components
    1. Battery
    2. Microphone transduces sound into electrical energy
    3. Receiver changes electrical energy into sound
    4. Most Hearing Aids can adjust volume
      1. May be a problem with background noise
  3. Sub-Types
    1. Linear (Simple Hearing Aid)
      1. Amplifies loud and soft sounds equally
    2. Non-Linear
      1. Varied amplification for loud and soft sounds
      2. Decreased recruitment (increased loudness)
  • Types
  • Programmable Hearing Aids
  1. Programmable by audiologist
  2. Sound levels adjustable for audibility and comfort
  3. Some available with multiple programs
    1. (e.g. telephone, music)
  • Types
  • Digital Hearing Aids
  1. Cost: ~$2900 per ear
  2. Digital signal processor samples incoming signals
  3. Adjusts in different sound environs
    1. Can reduce background noise from non-speech source
    2. Enhances speech understanding
  4. Programmable by audiologist