Multiplexing is a type of digital transmission in which one stream transmits several channels. In traditional analog broadcasting, multiplexing is used to transmit several television programs or radio programmes over a single carrier. This reduces the bandwidth needed to broadcast these signals, allowing more television stations and radio stations to be broadcast over the same channel frequency. Multiplexing also allows an individual with more than one TV set or radio device to tune those devices simultaneously.
Multiplexing was developed as an alternative to using a carrier wave for each individual digital channel, which would have taken up much more bandwidth.
When we see something like this:
5Vp–p<br>
the 5V means the peak voltage. The p–p stands for "peak-to-peak". In this case, 5V is the absolute maximum that could appear at any point in time, and 5V would be the absolute minimum that could appear at any time.
The real-world equivalent of this is the use of a cable coaxial cable to carry composite video and audio signals. In modern practice, however, while these include signals or wavelengths carrying video or audio, they are not used to carry multiplexed information. A multiplexed signal is a stream of digital information carried internally within a transmission system. Some systems mount physical wires upon which an electrical signal representing the digital data can be carried.
Satellite radio stations are transmitted using this technology.
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