Actually I'm just a high school student, I don't understand ' -6 dB/octave (-20 dB/decade' , and I still don't get why can't we have fs >> Fp ? or maybeif fs is too big, we don't really need modulation ?
after the diode if the cuttoff is too high then nothing will pass through it(or maybe only Fp ?), if it's too low then it will change nothing . if they are close how can the filter differ between Fp and fs ?
EDIT : but still why not fs >> Fp ?
Thank you for the answer .
Actually I am talking about AM modulation . We saw that modulation is 'good' if h≤1 where h is the index of modulation, because the envelope detection in the receiver deletes the negative part , but I don't see a relationship with frequencies ?? or maybe in another...
Homework Statement
Why do we need Fp>>fs for a good modulation, where Fp is the frequency of the Carrier signal and fs the frequency of the originalsignal
The Attempt at a Solution
If we had Fp≤ fs or less there is no use of modulation, we need a big frequency so waves can go long...