Why is modulation important in communication systems?

Modulation is crucial in communication systems because it enables the encoding of information onto a carrier signal, which is essential for effective transmission. By varying certain characteristics of the carrier signal—such as its amplitude, frequency, or phase—modulation allows for the efficient transfer of data over various media, be it air or cable. This encoding process makes it possible to transmit multiple signals simultaneously without interference, and allows for long-distance communication, where the original data can be safely retrieved by demodulating the signal at the receiving end.

The importance of modulation is reflected in its wide application across different types of communication systems, including radio, television, and data communication. It not only facilitates the transfer of audio and video signals but also ensures that digital data can be sent over analog lines.

While other factors like transmitter power, the need for routers, and physical range of communication are relevant to communication systems, they do not capture the primary function of modulation as effectively as the ability to encode information onto a carrier signal does.