Editing Angle modulation (section)

{{short description|Electronic method of transmitting information with a carrier wave}}
{{Modulation techniques}}

'''Angle modulation''' is a class of [[signal modulation]] that is used in [[telecommunication]] transmission systems using [[carrier wave]]s. The class comprises [[frequency modulation]] (FM) and [[phase modulation]] (PM), and is based on altering the [[frequency]] or the [[phase (waves)|phase]], respectively, of a [[carrier signal]] to encode the message signal. This contrasts with varying the [[amplitude]] of the carrier, practiced in [[amplitude modulation]] (AM) transmission, the earliest of the major modulation methods used widely in early radio broadcasting.