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Qu'est-ce (qui) est acoustic coupler - définition
COMMUNICATION DEVICE
Accoustic coupler; Acoustic coupling; Acoustically coupled modem; Phone coupler
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.
(1994-11-08)
instanter
![jarring and shocks]] when starting or slowing the train. The narrow buffers of the left-hand vehicle are sprung, the thicker buffers on the right contain a hydraulic damper. The sprung buffers allow for some train articulation even when the cars are drawn firmly together](https://commons.wikimedia.org/wiki/Special:FilePath/Carrage couplings on ABT Railway (3939380014).jpg?width=200 "jarring and shocks]] when starting or slowing the train. The narrow buffers of the left-hand vehicle are sprung, the thicker buffers on the right contain a hydraulic damper. The sprung buffers allow for some train articulation even when the cars are drawn firmly together")
![buffer]] with a [[hook]] on the right side and a chain on the other](https://commons.wikimedia.org/wiki/Special:FilePath/Uzd7742.jpg?width=200 "buffer]] with a [[hook]] on the right side and a chain on the other")
![Togo]]](https://commons.wikimedia.org/wiki/Special:FilePath/Togo Eisenbahn 086 1990-02.jpg?width=200 "Togo]]")
![Balance lever in front of buffer support ([[balance lever coupling]])](https://commons.wikimedia.org/wiki/Special:FilePath/Balancierhebelkupplung-außen.JPG?width=200 "Balance lever in front of buffer support ([[balance lever coupling]])")
![Balance lever behind buffer support ("[[balance lever coupling]]")](https://commons.wikimedia.org/wiki/Special:FilePath/Balancierhebelkupplung-innen.JPG?width=200 "Balance lever behind buffer support (\"[[balance lever coupling]]\")")
![Electric locomotive of the [[Furka Oberalp Bahn]] (today MGB ) with [[balance lever coupling]]](https://commons.wikimedia.org/wiki/Special:FilePath/CH FO HGE44-105-2.JPG?width=200 "Electric locomotive of the [[Furka Oberalp Bahn]] (today MGB ) with [[balance lever coupling]]")
![Center-buffer-and-chain used on the Royal Railway Cambodia BB 1056 diesel locomotive in [[Cambodia]]](https://commons.wikimedia.org/wiki/Special:FilePath/BB 1056 Cambodia0092.jpg?width=200 "Center-buffer-and-chain used on the Royal Railway Cambodia BB 1056 diesel locomotive in [[Cambodia]]")
COUPLING OF RAILWAY VEHICLES
Buffers and screw; Buffers and chain; Screw coupling; Buffer and chain coupler; Instanter; Screw coupler; English coupler; Buffers-and-chain coupling; Buffers and chain coupling; Draw gear and screw coupling; Three-link coupling; Buffer-and-screw coupler; English couplers; Screwlink; Central buffer and chain coupler; Center buffer couplers; Center buffer and side chain coupler; Center-buffer coupler; Center-buffer couplers
ad.
[L.] See instantaneously, Instantly.
screw coupling
COUPLING OF RAILWAY VEHICLES
Buffers and screw; Buffers and chain; Screw coupling; Buffer and chain coupler; Instanter; Screw coupler; English coupler; Buffers-and-chain coupling; Buffers and chain coupling; Draw gear and screw coupling; Three-link coupling; Buffer-and-screw coupler; English couplers; Screwlink; Central buffer and chain coupler; Center buffer couplers; Center buffer and side chain coupler; Center-buffer coupler; Center-buffer couplers
¦ noun a female screw with threads at both ends for joining lengths of pipes or rods.
Wikipédia
Acoustic coupler
In telecommunications, an acoustic coupler is an interface device for coupling electrical signals by acoustical means—usually into and out of a telephone.
The link is achieved through converting electric signals from the phone line to sound and reconvert sound to electric signals needed for the end terminal, such as a teletypewriter, and back, rather than through direct electrical connection.
