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January 22nd, 2016, 01:19 PM  #1 
Newbie Joined: Jan 2016 From: England Posts: 24 Thanks: 0  FM with graphs?
Hello. I'm experimenting with sound synthesis concepts in an online graphing calculator. I have the 4 basic waves and am doing combining, changing the frequency and amplitude and recently figured out amplitude modulation. One thing I am having trouble with is FM. Originally I thought it would work with transformation of graphs so I'd have the following: s(x) = sin(6x) I'm using the 6 to have a big difference in the waves to make the FM clearer m(x) = sin(x) Then I first (and wrongly) thought the equation for the FM of s(x) by m(x) would be: s(m(x)x) This is actually interesting as I found the wave seemed to turn back on itself every 150 degrees or so. So what is the relation between s(x) and m(x) that I need to create a nice example of FM where s(x) doesn't turn back on itself and appears as FM normally would? Thanks in advance Olie. 
January 24th, 2016, 01:38 PM  #2 
Newbie Joined: Jan 2016 From: England Posts: 24 Thanks: 0 
SOLVED: The function is: s(x + m(x)) However (and I have absolutely no idea why), this only works when the x axis is measured in radians. 

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