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Frequency modulation - Simple English Wikipedia, the free encyclopedia

Frequency modulation

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A sound wave, an AM wave, and an FM wave compared
A sound wave, an AM wave, and an FM wave compared

Frequency Modulation (usually shortened to FM) is a way of broadcasting radio signals. The sound quality of FM signals is higher than that of amplitude modulation (AM) signals. However, FM signals do not travel as far as AM.

Many radio stations send out both kinds of signals, reserving AM for talk shows, and FM for music. In addition, FM is usually sent as two signals (with one signal's frequency a little lower than the other), which can come to two different speakers in a home. This creates FM stereo.

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