acoustic coupler

noun

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

1968, in the meaning defined above

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