MATLAB Answers

Getting two components for one frequency in FFT

조회 수: 3(최근 30일)
Kaveri A
Kaveri A 2021년 4월 21일
댓글: Bjorn Gustavsson 2021년 4월 21일
Hi,
I'm getting 2 freq in fft .
But I have signal at 1MHz. Getting peak at 999000 and next is at 1MHz.(other frequencies are also there , 10k, 50k, 500k. For these peak is same as signal frequency.)
Sampling freq is 5MPs.
What is happening at 1MHz ?
Any reason for this?
Please clarify this.
Thank you..
  댓글 수: 2
Kaveri A
Kaveri A 2021년 4월 21일
Any code alterations needed?
Or other solution?
Please provide your suggestions...

댓글을 달려면 로그인하십시오.

채택된 답변

Bjorn Gustavsson
Bjorn Gustavsson 2021년 4월 21일
The fft is a circular Fourier transform, there will always be some spectral leakage from frequencies that are not exactly periodic over your data-sample-array. That is what you see here.
HTH
  댓글 수: 6
Bjorn Gustavsson
Bjorn Gustavsson 2021년 4월 21일
Code looks OK, share the input signal for more detailed answer.

댓글을 달려면 로그인하십시오.

추가 답변(0개)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by