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Name: Scot
Status: student
Age: 40s
Location: N/A
Country: N/A
Date: 1999
Question:
Why does amplitude modulation of a carrier signal produce both an upper and a lower sideband?

Replies:
Because amplitude modulation amounts to multiplying the carrier waveform by the modulating waveform. Take the carrier wave as cos(a) and the modulating wave as cos(b). cos(a)cos(b) = (cos(a+b) + cos(a-b))/2.

Tim Mooney


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