Taajuusmoduloitu

Taajuusmoduloitu is the Finnish term for frequency modulation, commonly abbreviated as FM. It is a method of encoding information onto a carrier wave by varying its frequency. In frequency modulation, the amplitude of the carrier wave remains constant, while its instantaneous frequency deviates from the center frequency in proportion to the instantaneous amplitude of the modulating signal. This technique is widely used in radio broadcasting, particularly for FM radio stations, due to its resistance to noise and interference compared to amplitude modulation. The wider bandwidth required for FM signals is a trade-off for its improved fidelity. The deviation of the carrier frequency is what carries the audio information. When the modulating signal increases in amplitude, the carrier frequency increases, and when the modulating signal decreases, the carrier frequency decreases. The maximum frequency deviation is a key parameter in FM systems and is related to the signal-to-noise ratio achieved. FM is also employed in various other applications, including some forms of wireless communication and analog video signals.