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every time i plot signal spectrum from 0-250 ,its flat between o-100

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ihab
ihab am 13 Jul. 2016
i have a signal consists of multiple frequencies plus noise , when i use SPECTRUM = db(abs(TEMPFFT(512:-1:1))) to plot spectrum from 0 - 250 HZ i get attenuated near zero flat between 0 - 100. after 100 i get the spectrum OK. what is attenuating my signal between 0 - 50?

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