How hearing aids work (2) - PowerPoint PPT Presentation

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How hearing aids work (2)

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A hearing aid is a device designed to improve hearing by making sound audible to a person with hearing loss.It is two type analog hearing aids and digital hearin aids. – PowerPoint PPT presentation

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Title: How hearing aids work (2)


1
How hearing aids work?

sourcehttps//www.hearingsol.c
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2
Working of hearing aids
  • Improved speech understanding in noisy
    environments
  • Increased gain without feedback
  • Enhanced listening comfort and speech perception
  • Ability to shape instrument settings to match the
    specific wearer's hearing needs
  • More precise directional capabilities

3
Component of Hearing aids
  1. Microphone
  2. Amplifier
  3. Speaker(Receiver)
  4. Power supply

4
Microphone
  • The first part of a hearing aid is called the
    microphone.
  • The microphone picks up sounds from the users
    environment and converts them to electrical
    signals before transporting them to the
    amplifier.
  • There are primarily two different types of
    microphones for hearing aids directional and
    omnidirectional (also called non-directional).
  • Directional microphones typically pick up noises
    that are directly in front of the wearer, while
    omni directional/non-directional microphones
    detect sound from all directions around the user.

5
Amplifier
  • The second primary part of a hearing aid is the
    amplifier.
  • The amplifier takes the electrical signals that
    were sent to it by the microphone and increases
    and improves the sound and quality of the audio
    information.
  • Filters built into the amplifier constantly work
    to remove extraneous, irrelevant, and distracting
    sounds from the data, such as wind, background
    noise, and other audio feedback.

6
Speaker(Receiver)
  • The speaker, sometimes referred to as the
    receiver, is the final component of the hearing
    aid.
  • It takes the modified electrical input from the
    amplifier and converts it back into audio waves
    that are understandable by the ear and the human
    brain.
  • The speakers audio output directly faces the
    wearers inner ear, so that the sound effectively
    reaches the proper structures in the ear that are
    responsible for hearing.

7
Power supply
  • The most common type is still the zinc-air button
    disposable battery.
  • Traditionally hearing aid batteries were produced
    using trace amounts of mercury to assist with
    conductivity and stabilize internal components,
    but mercury is no longer used in hearing aid
    batteries.
  • Battery(Power supply) of a hearing aids is
    rechargeable.
  • Zinc-air batteries remain stable for up to three
    years when stored in a room temperature, dry
    environment.

8
Digimatic working hearing aids
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