Frequency modulation exhibits a so-called capture effect The
capture effect is a direct result of the rapid nonlinear improvement in received
quality for an increase in received power. If two signals in the same frequency
band are available at an FM receiver, the one appearing at the higher received
signal level is accepted and demodulated, while the weaker one is rejected. This
inherent ability to pick up the strongest signal and reject the rest makes FM systems
very resistant to co-channel interference and provides excellent subjective
received quality. In AM systems, on the other hand, all of the interferers are
received at once and must be discriminated after the demodulation process.
capture effect is a direct result of the rapid nonlinear improvement in received
quality for an increase in received power. If two signals in the same frequency
band are available at an FM receiver, the one appearing at the higher received
signal level is accepted and demodulated, while the weaker one is rejected. This
inherent ability to pick up the strongest signal and reject the rest makes FM systems
very resistant to co-channel interference and provides excellent subjective
received quality. In AM systems, on the other hand, all of the interferers are
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