Modulation
![A low-frequency message signal (top) may be carried by an AM or FM radio wave.](/Images/godic/202502/05/Amfm3-en-de5906.gif")
![Schematic of 4 baud (8 bit/s) data link containing arbitrarily chosen values.](/Images/godic/202502/05/Baud.svg5906.png")
In electronics and telecommunications, 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.
In telecommunications, modulation is the process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted. Modulation of a sine waveform transforms a baseband message signal into a passband signal.