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Frequency Modulation for varition of pitch frequency

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Farideh Jalali
Farideh Jalali 2012-8-9
I need to varied pitch frequency 125 by frequency modulation ,I need to get from freqmod positive numbers ,How can I do that?PP is pitch period in seconds and should be positive,
for freqmod(m) = 1*cos (2*pi*(fc/fs)*m + (fd/fm)*cos (2*pi*(fm/fs)*m));
%PP=1/freqmod(m);
end;

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