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The main function of a hearing aid is to the help hard of hearing to improve their lives while allowing them to recognize and hear sounds and voices they were previously unable to due to their condition. Hearing aids use digital sound processing to reproduce sounds and deliver them to the ear as naturally as possible.
However, sometimes the hearing aid picks up not only the sounds that the wearer wants to hear but noise and feedback that are unpleasant to the ear. Many modern hearing aids have multiple features for suppressing background noise and eliminating feedback. Occasionally though, we cannot prevent such noises or occur due to problems with the electronics, poor maintenance or signal intermittence. An example of such undesired noise is static noise.