If an FM signal is modulated by a single frequency sine wave, what it the result of limiting the bandwidth? Is it increased distortion of the demodulated signal? Theoretically, the number of sidebands is infinite. In the real world, the bandwidth is limited so that the higher order sidebands are greatly attenuated. Regards, Jon
Frequency Modulation
Jul 11, 2006
2 Replies
The result is a signal that is both frequency and amplitude modulated. The amount of distortion depends on the receiver technology, but in general yes, it'll be distorted.
Tim Wescott
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For D > m the effective bandwidth is approximately 2 * (D+m) where D is the p-p deviation and m is the frequency of the modulating signal.
JosephKK
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