modulation of waves

Modulation is the process of varying a characteristic of a carrier wave, such as its amplitude, frequency, or phase, to encode information. This is essential for transmitting signals through various media, as it allows information to be translated into a frequency range suitable for the channel. For example, modulation enables multiple users to share a communication channel without interference by assigning each a unique carrier frequency. It also allows for the use of smaller antennas, as high-frequency signals require less elaborate antenna designs.12

Digital modulation adapts analog carrier waves to represent binary data. Common methods include:
* Amplitude-shift keying (ASK): Varies the amplitude of the carrier wave.3
* Frequency-shift keying (FSK): Uses different frequencies to represent binary 0s and 1s.4
* Phase-shift keying (PSK): Alters the phase of the carrier wave.2

After transmission, the original information is recovered through demodulation.25