acoustic coupler - définition. Qu'est-ce que acoustic coupler
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Qu'est-ce (qui) est acoustic coupler - définition

COMMUNICATION DEVICE
Accoustic coupler; Acoustic coupling; Acoustically coupled modem; Phone coupler
  • Sendata Series 700

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
  • Chain coupler detail (train in shunting mode)
  • Three-link coupling on an antique tank wagon. There is no hook at the end of the chain, nor is there a turnbuckle.
  • Buffer-locking
  • buffer]] with a [[hook]] on the right side and a chain on the other
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         
  • 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
  • Chain coupler detail (train in shunting mode)
  • Three-link coupling on an antique tank wagon. There is no hook at the end of the chain, nor is there a turnbuckle.
  • Buffer-locking
  • buffer]] with a [[hook]] on the right side and a chain on the other
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.