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ADAAG Manual

Note: This document, portion of document or referenced document was published prior to the 2010 ADA Standards, and is still applicable.

How ALSs Operate

Like public address systems, ALSs convert live or recorded sound into an electromagnetic signal. A sound source (usually a microphone) sends the signal to a transmitter which relays it to receivers provided to listeners. Couplers, such as ear phones, decode the signal from the receiver and convert it back into sound for the user. Recommendation: While a "complete" system with the necessary components can be bought off-the-shelf, ALSs designed as "mix and match" systems can provide a range of components appropriate for individual users, events, and environments.

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