Acoustic coupler
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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 elec
The Novation CAT acoustically coupled modem
Sendata Series 700
Coupleur accoustique IMG 0298
Hush-A-Phone v. United States, 238 F.2d 266 was an important ruling in United States telecommunications decided by the D.C. Circuit Court of Appeals. Hush-A-Phone Corporation marketed a small, cup-lik
Acoustic coupler
…could not be directly connected in any case, despite the general electrical compatibility. It was not until a landmark U.S. court ruling regarding the Hush-A-Phone in 1956 that the use of a phone attachment (by a third party vendor) was allowed for the first time; although AT&T's right to regulate any device…
An early Hush-A-Phone model attached to a candlestick telephone.