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Frequency Modulation

Audio/Video Glossary - Frequency ModulationWhen a low frequency signal modulates (changes) the frequency of an RF signal of a much higher frequency (causing it to move around the basic carrier frequency) - the process is called frequency modulation or FM. This system is extensively used in broadcast radio transmission, as it retains high signal quality. FM is used in video to record signals on videotape. The FM system is less prone to interference and is therefore used in higher quality equipment.