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频率调制信号公式 The function of the Frequency Modulating signal is: s_{fm}(t)=A\cos(2\pi f_{i}t) and the f_{i} is the instantaneous frequency of a VCO-generated FM signal: f_{i}=f_{c}+k_{f}\cdot m(t) where f_{c} is the carrier frequency, k_{f} is the VCO gain (or the frequency sensitivity factor) measured in Hz/V and m(t) is the message signal.
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