noun
a type of modem that uses audio tones to transmit and receive data over a telephone line
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The acoustic coupler is a device used to connect a modem to a telephone line by using audio tones.
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I had to use an acoustic coupler to connect to the internet back in the day.
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Do you remember those old-school acoustic couplers for dial-up internet?
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The acoustic coupler serves as a bridge between the modem and the telephone line.