What is an Acoustic Coupler?
An acoustic coupler is a device which sends and receives computer data through a telephone line using sounds rather than electrical signals. The devices were popular in the early days of internet use when traditional modems were not always practical. Today, they are mainly seen in countries with less advanced telecommunications networks, and in equipment used by deaf people to make telephone calls. At one time, it was impossible in many places to use a standard modem which plugged into a telephone wall socket. This could sometimes be a physical problem where telephone cables went directly into the wall, meaning there was no socket. In other cases, there were laws banning anyone from connecting electrical equipment directly into the phone system. The solution for people wanting to connect to the internet was the acoustic coupler. The most common type was a device onto which you placed the handset of your telephone. There were usually padded seals so that no noise could leak into or out
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