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frequency modulation sinwave with 3 different frequencies

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Manolis Michailidis
编辑： Manolis Michailidis 2015-4-23
Hi, i want to make a sinwave that will change his frequency 3 times (like in the picture i uploaded
), i tryied with fmmod function but i can't make it work. So is there any other way to do it? Note f1=40Hz , f2=50 and f3=80 fs =100 thanks in advance.

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