User:Nottheboss/Assistive Listening Device

Assistive Listening Device

Assistive listening devices (ALDs) or assistive listening systems (ALSs) are instruments that are designed to improve a person's ability to hear in specific listening situations. Some ALDs amplify a sound signal, but the primary purpose of an ALD is to make the targeted sound (e.g., a teacher's voice, a movie, etc.) easier to hear by isolating the sound source from surrounding noise.

References

http://atwiki.assistivetech.net/index.php/Assistive_listening_devices