A hearing aid is a small electronic device worn in or behind your ear(s). This device has a microphone, and amplifier and filter circuits built into a tiny housing, plus a speaker (or receiver) that sends the improved louder sound to your ear drum.
The use of analog processing in hearing aids is virtually extinct today.
Digital aids convert soundwaves into numerical codes, similar to the binary code of a computer, before amplifying them. Virtually all the music you hear today has been digitized. In hearing aids, the aid can be specially programmed to amplify some frequencies more than others. Digital circuits gives a hearing professional more flexibility in programming the aid to a user’s needs and to certain listening environments. These aids also can be programmed to focus on sounds coming from a specific direction using tiny directional microphones built into housing.
Digital circuits are now amazingly complex, and hearing aids borrow from smart phone technology breakthroughs. A modern digital hearing aid is a tech marvel. The number of circuits combined, of course, impacts the price of the hearing aid. Quality digital aids are not cheap, despite what you may see and hear in advertisements.
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