(Computer Science) computing a device converting computer-data signals into acoustic form for transmission down a telephone line, through the handset microphone. See also modem
On-call representatives are outfitted with laptops, cellular telephones, and acoustic couplers. Using multiprotocol support, they communicate by cellular phone (with an acoustic coupler at the customer's office) while on the road, and from direct dial-up at their home.
The MessageSender is a pocket-size portable Qwerty keyboard and acoustic coupler that lets users send text and numeric pages from a phone, without the need for a modem or dedicated line.
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