Home exam problem - helicopter that produces sound

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garryl

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help me please

i have a take home exam.. its all about matlab.. please help me..
the problem is.. theres an helicopter that produces sound where harmonics 6...15 dominate.. create the sound.. it has 780 rotations per minute.. use matlab..
next question-- what happens when u remove one harmonics?,,..
please guys help me..
 

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