noise in dac output in fft filter -


i designed fft filter (taking forward , inverse fft) in keil uvision using stm32f429 discovery board. on taking output dac oscilloscope, between 2 consecutive dac outputs lot of noise occurs.

any in coding or other related knowledge of great help.

link oscilloscope pics displaying output dac(yellow) , input signal(pink) , fft filter code posted below: link1: https://drive.google.com/open?id=0b9ng28trmeefvlbstdnizg1euwm&authuser=0 link2: https://drive.google.com/open?id=0b9ng28trmeefzglfdwc1n2q5znm&authuser=0

since mentioned decreasing number of samples in fft reduces issue sounds processing speed issue.

an fft has o(n log2(n)) increasing number of samples increases amount of processing power required.

how coming number of samples need? frequency resolution need application? if intend sample rate stay now, way change time , frequency resolution changing number of samples.

i recommend coming minimum frequency resolution required. round number of samples closest power of 2 , test out program criteria.


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