acoustic coupler

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acoustic coupler

[ə′küs·tik ′kəp·lər]
(engineering acoustics)
A device used between the modem of a computer terminal and a standard telephone line to permit transmission of digital data in either direction without making direct connections.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

acoustic coupler

(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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

acoustic coupler

A device that connects a terminal or computer to the handset of a telephone. It contains a shaped foam bed that the handset is placed in, and it also may contain the modem.


Acoustic Coupler
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References in periodicals archive ?
-The 3rd is Acoustic coupling, but Tenacity ipTTY and Direct connect is recommended over acoustic coupling."
With excessive crosstalk, if each pilot is listening to a different radio (such as when one is off getting ATIS), one pilot's radio can be heard by the other pilot because of this acoustic coupling of the sound from the ear through the mic and the intercom.
Good azimuth is critical to achieving sharp channel separation and the lack of a headshell reduces the area on which acoustic coupling can occur to the arm.
Topics included in the section on general inspection requirements are cleaning and coupling requirements, interpretation of signals, defect sizing techniques, effect of wear grooves, phenomena of acoustic coupling, inspection documentation, data collection, and inspector qualifications and certifications.
It also has a duplex controller with signal and noise monitors on both channels to prevent the howling that can occur in hands-free telephones as a result of the acoustic coupling between the loudspeaker and the microphone.
In reality, this is not the case because of the special properties that are displayed by biological macromolecules to acoustic coupling at interfaces.
As Donald Miller has pointed out, an F1/H1 match is a very characteristic acoustic coupling that singers will recognize as full head or falsetto in sound, that is, as somewhat "hooty" or "whoop-like" in timbre.
The corrosion detection by AE method requires the acoustic coupling enabling the propagation of AE signals from source to a sensor mounted on a wall.
The hard rubber disk glued onto the sensor is about one mm thick and aids in the acoustic coupling to the cylinder.