acoustic coupler

In telecommunications, the term acoustic coupler has the following meanings: An interface device for coupling electrical signals by acoustical means--usually into and out of a telephone instrument. A terminal device used to link data terminals and radio sets with the telephone network. The link is achieved through acoustic (sound) signals rather than through direct electrical connection.Prior to the deregulation of telephony in many countries of the world, it was illegal to make an electrical connection to the telephone network. Also, in many households, telephones were hard-wired to wall terminals before connectors like RJ11 and BS 6312 became standardised. With the increased use of computing, acoustic couplers were used to connect modems to the telephone network. Speeds were typically 300 bits per second, achieved by modulating a carrier at 300 baud. The first such device was the ACOUSTIC DATA COUPLER 300 MODEM from 1968.
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1. An interface device for coupling electrical signals by acoustical means--usually into and out of a telephone instrument. (188 ) 2. A terminal device used to link data terminals and radio sets with the telephone network. Note: The link is achieved through acoustic (sound) signals rather than through direct electrical connection.

<hardware, communications> A device used to connect a modem to a telephone line via an ordinary handset. The acoustic coupler converts electrical signals from the modem to sound via a loudspeaker, against which the mouthpiece of a telephone handset is placed. The earpiece is placed against a microphone which converts sound to electrical signals which return to the modem. The handset is inserted into a sound-proof box containing the louspeaker and microphone to avoid interference from ambient noise.
Acousitic couplers are now rarely used since most modems have a direct electrical connection to the telephone line. This avoids the signal degradation caused by conversion to and from audio. Direct connection is not always possible, and was actually illegal in the United Kingdom before British Telecom was privatised. BT's predecessor, the General Post Office, did not allow subscribers to connect their own equipment to the telephone line.
(1994-11-08)

acoustic coupler
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