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An acoustic coupler (also referred to as an acoustical coupler) is
|“||a device for entering data signal into a network from a conventional telephone using audible sounds to effect the connection.||”|
|“||[a] device that converts electrical signals into audio signals, enabling data to be transmitted over the public telephone network via a conventional telephone handset; it also converts the audio signals back into electrical signals at the receiving end. A kind of modem.||”|