Frequency Modulation (FM) Tutorial

FM is a form of analog angle modulation in which the baseband information carrying signal varies the frequency of a carrier wave. Audio signals transmitted by FM radio are the most common. However, FM radio can also transmit digital data with the low bandwidth digital information known as Radio Data System (RDS) in Europe and Radio Broadcast Data System (RBDS) in the U.S.

This article presents a basic tutorial on FM with descriptions of multiplex (MPX) signaling and noise improvement techniques such as stereo-mono blending and soft mute.

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