How hearing aids work

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How hearing aids work?
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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

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Component of Hearing aids

1. Microphone
2. Amplifier
3. Speaker(Receiver)
4. Power supply

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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.

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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.

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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.

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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.

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Digimatic working hearing aids