Taajuussignaali

Taajuussignaali refers to a signal whose information is encoded in its frequency. Unlike amplitude modulation where the amplitude of a carrier wave is varied, in frequency modulation (FM), the instantaneous frequency of the carrier wave is varied in proportion to the instantaneous amplitude of the modulating signal. This means that the frequency of the signal changes over time, and these changes represent the information being transmitted.

Taajuussignals are widely used in various communication systems, most notably in FM radio broadcasting. FM offers several advantages over amplitude modulation (AM), including better immunity to noise and interference. This is because most natural and man-made noise sources tend to affect the amplitude of a signal rather than its frequency. By de-emphasizing amplitude variations during reception, FM receivers can effectively filter out much of this unwanted noise, resulting in a clearer audio signal.

Beyond broadcasting, taajuussignals find applications in areas such as telecommunications, radar systems, and musical instrument synthesis. In telephony, frequency-division multiplexing (FDM) uses different frequency bands to transmit multiple signals simultaneously over a single communication channel. In radar, frequency-modulated continuous-wave (FMCW) radar systems use frequency-modulated signals to determine the distance and velocity of targets. The principle of varying frequency to convey information makes taajuussignals a versatile and robust technique in signal processing and communication.