What is Modulation
Computer Science
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Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
The purpose of modulation is usually to allow a signal to be transmitted over a communication channel. For example, radio waves are used to transmit information over long distances, but the information signal (like voice) is often at a much lower frequency than the radio waves. By modulating a high-frequency carrier wave with the low-frequency information signal, the combined signal can be efficiently transmitted.
There are several types of modulation:
- Amplitude Modulation (AM): The amplitude of the carrier signal is varied in proportion to the message signal.
- Frequency Modulation (FM): The frequency of the carrier signal is varied in proportion to the message signal.
- Phase Modulation (PM): The phase of the carrier signal is varied in proportion to the message signal.
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