Telecommunications is about transferring information from one location to a different . This includes many sorts of information: telephone conversations, television signals, computer files, and other sorts of data. To transfer the knowledge , you would like a channel between the 2 locations. this might be a wire pair, radio wave , glass fiber , etc. Telecommunications companies receive payment for transferring their customer's information, while they need to pay to determine and maintain the channel. The financial bottom line is simple: the more information they will undergo one channel, the extra money they create . DSP has revolutionized the telecommunications industry in many areas: signaling tone generation and detection, waveband shifting, filtering to get rid of power cable hum, etc. Three specific examples from the phonephone network are going to be discussed here: multiplexing, compression, and echo control. There are approximately one billion telephones within the world. At the press of a couple of buttons, switching networks allow anybody of those to be connected to the other in just a couple of seconds. The immensity of this task is mind boggling! Until the 1960s, a connection between two telephones required passing the analog voice signals through mechanical switches and amplifiers. One connection required one pair of wires. as compared , DSP converts audio signals into a stream of serial digital data. Since bits are often easily intertwined and later separated, many telephone conversations are often transmitted on one channel. for instance , a telephone standard referred to as the T-carrier system can simultaneously transmit 24 voice signals.  

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