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Consider an FM wave f(t) = cos[2πfct + \(\beta\)1 sin 2πf1t + \(\beta\)22πf2t] . The maximum deviation of the instantaneous frequency from the carrier frequency fc is (a) \(\beta\)1f1 + \(\beta\)2f2 (b) \(\beta\)1f2+ \(\beta\)2f1 (c) \(\beta\)1 + \(\beta\)2 (d) f1 + f2 |
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Answer» (a) \(\beta\)1f1 + \(\beta\)2f2 The instantaneous value of the angular frequency ωi = ωc + d/dt(\(\beta\)1 sin 2πf1t + \(\beta\)22πf2t) ωc +\(\beta\)12πf1 cos 2πf1t + \(\beta\)22πf2 cos 2πf2t fi = fc + \(\beta\)1f1 cos 2πf1t + \(\beta\)2f2 cos 2πf2t |
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