How Modulation is Done ?

Answer: Modulation is achieved by superimposing the baseband signal onto a carrier signal. The carrier signal typically has a much higher frequency than the baseband signal and serves as a medium for transmitting the information over a communication channel.

Types of Modulation

1. Amplitude Modulation (AM): In amplitude modulation, amplitude of the carrier is modulated by an information wave, which may be thought of in terms of the amplitude displayed by the modulating signal. This belongs to the simplest form of modulation which is the modulation of the amplitude(such as AM radio).
2. Frequency Modulation (FM): The carrier signal is made to modulate at the frequency of the modulating signal by varying the carrier signal’s frequency in frequency modulation.
3. Phase Modulation (PM): In phase modulation, this happens by changing the phase of the carrier signal so it is also proportional to the modulating signal.
4. Pulse Modulation: Pulse Code Modulation is the technique used for reworking analog signals into digital signals.
5. Quadrature Amplitude Modulation (QAM): QAM is a modulation technique that can find both the amplitude and the phase. It affects the amplitude and phase of the carrier signal, thus remaining.
6. Phase Shift Keying (PSK): PSK is a type of digital modulation that encodes data by having the carrier wave frequency varying depending on the phase change that represents the digital state (0 and 1).