discrete Fourier transform maximum value
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Hi, guys, I have question bout DFT problems I'm trying to find the maximum absolute value of DFT. The original signal is sin wave with 2KHz. Sampling frequencies are 10KHz. N=100 samples of this signal are transformed using the DFT, yielding 100 samples in frequency domain: X0, X1,…,XN-1. And, wondering which samples have maximum absolute values?
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Star Strider
2017-6-10
0 个投票
Use the Signal Processing Toolbox findpeaks function. It will return the maximum value and the associated frequency.
Otherwise, use the max function with 2 outputs. The second output is the index of the maximum value. Use that with your frequency vector to find the maximum value.
2 个评论
Soomin Yang
2017-6-10
Star Strider
2017-6-10
My pleasure.
If you are calculating it by hand, plot it and then just look at the plot to see where the maximum is!
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2017-6-10
2017-6-10
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