Hearing aids amplify the sound
Each patient has a unique pattern of hearing loss which can be diagnosed by PURE TONE AUDIOMETRY
TYPES OF HEARING AIDS
A. BY QUALITY OF THE SOUND
1.Analogue hearing aid- They amplify two frequency bands of the sound,, the low frequency band and the high frequency band as a general…the sound quality is much more worse than DIGITAL HEARING AIDS.
2.Diigital hearing aid- They broken the sound into multiple frequency bands..each band is then amplified by the amount necessary to improve the patients hearing to the normal level at the band.
Upto 24 frequency bands are amplified
B. BY POSITION OF HEARING AIDS
pocket model hearing aid
behind the ear (BTE)
in the canal (ITE)
completely in canal (CIC)