Vary the Amplitude In AM modulation, the voltage (amplitude) of the carrier is varied by the incoming signal. In this example, the modulating wave implies an analog signal.

1. Three basic digital modulation formats are still very popular with low-data-rate short-range wireless applications: amplitude shift keying (a), on-off keying (b), and frequency shift keying (c).

That is phase, amplitude, and frequency modulation all combined in the form of FFT/IFFT. I think of simple digital phase modulation as discrete changes in phase. Bi-phase modulation would be 180 ...

Complex light modulation—controlling light’s amplitude and phase—is key to many laser applications such as optical tweezers and holographic displays. To achieve such modulation at high ...

AM is also the main modulation of short-wave radio, which you can hear worldwide from 5 to 30 MHz. It’s still one of the main sources of information for many third-world countries. Short-wave ...