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ALDs (Assistive Listening Devices) are amplification systems designed specifically to help people hear better in a variety of listening situations. ALDs can be used with a personal hearing aid or by themselves to help overcome background noises and distance from the sound source. The basic function of an ALD is to improve the "signal to noise ratio" for the listener. This means that desired sounds (signals) are amplified, and undesirable sounds (noise) are minimized.
ALDs can be used in many listening situations. They can be used to enhance sound in large public facilities or in group situations. They be used to improve your enjoyment of the TV, stereo or conversations.
Choosing an ALD is based on the listening situation and your listening needs. The types of ALDs include Personal Amplified Systems (A), Infrared Systems (IR), FM Systems (FM), Loop Systems (L) and Soundfields (S).
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