In frequency Modulation a carrier is more high-frequency comparing to the information signal and frequency-modulated signal amplitude is steady. Frequency-modulated signal is notable for high noise resistance and used for high-quality data transfer: in broadcasting, television, radiophones etc.
Deviation and modulation index are the main frequency modulation characteristics.
Frequency deviation is the biggest deviation of modulated signal value from its carrier frequency value. Frequency deviation is expressed in Hertz (Hz).
Modulation index is frequency deviation to modulated signal frequency ratio.
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