Definition of acoustic coupler
: a device that converts digital signals to audio signals in order to allow the transmission of data (as from a computer) over a telephone line An acoustic coupler …, tightly strapped to the phone receiver, allows the computer to fire audio tones directly through the handset, the way we do when we speak. — Jack Hitt and Paul Tough, Esquire, December 1990
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First Known Use of acoustic coupler
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