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Chapter 7. Amplitude Modulation Techniqu... > 7.1 Principle of AM Generation

7.1 Principle of AM Generation

Amplitude modulation (AM) is a linear modulation. This is because the superposition principle holds. If a carrier sc(t) is amplitude modulated separately by the modulating signals m1(t) and m2(t) producing modulated signals sm1(t) and sm2(t), respectively, then the effect of modulating the same carrier by the sum of the two signals is a modulating signal that is the sum of the two modulated waveforms [sm1(t) + sm2(t)].

But the process involved in generating AM must be non-linear because multiplication is a non-linear process. When same frequencies are contained in the input and output signals of a processor, then the operations performed by the processor on the signals is linear. However if new frequency components are introduced at the output, then the processor has performed a non-linear operation on the input signals.


  

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