frekvensmodulerade

Frekvensmodulerade, often abbreviated as FM, refers to a method of encoding information onto a carrier wave by varying its frequency. This technique is widely used in radio broadcasting, particularly for high-fidelity audio transmission. In FM, the amplitude of the carrier wave remains constant, while its frequency is altered in proportion to the instantaneous amplitude of the message signal. This means that a higher amplitude in the original signal will cause a greater deviation in the carrier's frequency from its center frequency.

The process of frequency modulation involves two key components: a modulator and a demodulator. The modulator takes the message signal and the carrier wave and produces the frequency-modulated signal. The demodulator, typically found in a receiver, reverses this process, extracting the original message signal from the FM wave. FM is known for its ability to resist noise and interference better than amplitude modulation (AM) because most natural and man-made noise affects the amplitude of a signal, not its frequency. This characteristic makes FM well-suited for applications requiring high-quality sound reproduction.

Beyond radio, frequency modulation is also employed in various other communication systems, including analog television sound, some forms of wireless communication, and even in certain aspects of digital signal processing. The ability to maintain signal integrity in the presence of interference is a significant advantage of FM technology.