
HEARING AID
•Hearing aid is a small electronic device that you wear in or behind your ear. It's make sounds louder so that a person with hearing loss can listen communicate with others.
• Hearing aids work by amplifying sound through a three part system. The microphone receives sound and convert it into a digital signal. The amplifier increases the strength of the digital signal. The speaker produces the amplifying sound into the ear.
•Types-
~BTE- Behind the ear. It covers mild to profound loss. It connect with the ear by mould.
~ITE- In the ear, it covers mild to severe loss.
~ ITC- In the canal, it covers mild to moderately sever
Loss.
~RIC- receivers in the canal. Attached with a receivers mould or dome.
~CIC-completely in canal. Cover mild to severe loss.
~ analog -pocket model . Connect with a wire .
Chargeable rechargeable machines.
*Information about hearing:
#Normal Hearing-0-25hz, / 40 decible. Over 85 dB it's called damage.
# mild loss - 25-40 dB
# moderate loss-40-60dB
# severe loss- 60-80 dB
# profound loss- 80-120 dB
Low frequency sound- 250-500Hz like water drop, clock ticking
Mid frequency sound- 1khz-2khz male voice, normal sound of things,animals etc.
High frequency sound- 4khz-8khz, quarreling, chirping, female voice, high honking.
AC-Air conduction. External ear to audiemetry cortex sound.
BC-bone conduction- Sensoneural structure measurements.
Audiometry is hearing test. It is done by Tympanometer.
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