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amplitude modulation frequency spectrum..

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electroboy

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cant understand this negative frequency concept clearly ..please help..How can frequencies in frequency spectrum be negative?
thanks in advance...
 

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Hi,
If your consider your system "causal" signal just exist after 0.
The spectrum can not be negative.
We just use spectrum as negative because it is associated with simplest learning mathematical concept.
Hope ti helps you
joseMiguel
 
This question ("are there negative frequencies"?) has been extensively dicussed in this forum some time ago. Try the search function.
 
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