Hearing aids

A hearing aid is an electroacoustic body worn apparatus which typically fits in or behind the wearer's ear, and is designed to amplify and modulate sounds for the wearer. Earlier devices, known as an "ear trumpet" or "ear horn", were passive funnel-like amplification cones designed to gather sound energy and direct it into the ear canal. Similar devices include the bone anchored hearing aid, and cochlear implant.

1 Types of hearing aids
1.1 Body worn aids
1.2 Behind the ear aids (BTE)
1.3 In the ear aids (ITE)
1.4 Receiver In the ear aids (RITE)
1.5 In the canal (ITC), mini canal (MIC) and completely in the canal aids (CIC)
1.6 Open-fit devices
1.7 Personal programmable or consumer programmable
1.8 Bone Anchored Hearing Aids (BAHA)
1.9 Eyeglass aids
2 Hearing aid technology
2.1 Wireless
2.2 Directional microphones
2.3 Telecoil
2.3.1 Legislation affecting use
2.4 DAI
2.5 Processing

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