<sod>Angle Modulation is modulation in which the angle of a sine-wave carrier is varied by a modulating wave. [[Frequency modulation]] (FM) and [[phase modulation]] (PM) are the two main types of angle modulation. In frequency modulation the modulating signal causes the [[carrier frequency]] to vary. These variations are controlled by both the frequency and the amplitude of the modulating wave. In phase modulation the phase of the carrier is controlled by the modulating waveform.<eod>
<sod>Angle Modulation is modulation in which the angle of a sine-wave carrier is varied by a modulating wave. [[Frequency modulation]] (FM) and [[phase modulation]] (PM) are the two main types of angle modulation. In frequency modulation, the modulating signal causes the [[carrier frequency]] to vary. These variations are controlled by both the frequency and the amplitude of the modulating wave. In phase modulation, the phase of the carrier is controlled by the modulating waveform.<eod>