The main purpose of devices that are used so that sound is amplified to alleviate impaired hearing is to separate background noise from critical speech signals that are necessary for the person to understand what is being said. In other words, it is not just enough to have your audiologist conduct a comparative hearing aid selection where the patient would pick up the one that fits them best. The important thing to identify is the type of technology used to amplify speech signals and control unnecessary loud sounds that would hinder the person from hearing properly.
Some analogue hearing aids can detect whether sounds are loud or quiet. What this means is the device is able to recognize loud sounds like traffic sounds that it does not amplify further. This is the automatic gain feature of the device.
On the other hand, the digital hearing aid has a more sophisticated means of processing incoming sounds and converts them into clearer and more audible sounds and these sounds are released at the right sound level into the ears of the patient so that he can receive them comfortably. Thus, when an audiologist makes a prescription, it is more precise, and able to target your level of hearing loss, personal lifestyle, and appearance factor. With digital hearing aids, you can hear normal and look normal, unlike when you wear the traditional analog hearing aids.
The second best thing about the digital hearing aid is that it is digital. This means that you don’t near to throw it our if your hearing problem worsens. Reprogramming this hearing aid is possible through computer means by your hearing aid professional so that it adjust to your level of hearing, and you don’t need to get a new one.
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We have to remember that the center of human hearing is the most powerful signal processor found in our brains. The sound processor in our brains are simply left to guess that sound it hears if the sound input from both ears are not clear. In other words, when an endless stream of sound waves from both ears is then converted into electrical energy to be fed to the central processor is marred then it follows that its interpretation will also be incorrect.
In the same way, if you just amplify sound without filtering out what our central processor in the brain has been doing to sounds in the environment, discriminating particular sounds of signals, cuing sounds that has been stored as memory, then there will be a distorted processing, and your common and rational perception is affected, and the only way to bring it all back to normal behavior is to correct it immediately through this human made technology which is the hearing aid.