# How do frequencies shift after a FFT?

**URL:** <https://discourse.julialang.org/t/how-do-frequencies-shift-after-a-fft/88089>\
**Category:** Signal and Image Processing\
**Tags:** fftw, dsp, fft\
**Created:** [October 1, 2022, 4:11pm UTC](https://discourse.julialang.org/t/how-do-frequencies-shift-after-a-fft/88089 "2022-10-01T16:11:31Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![stephancb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stephancb/32/14243_2.png) [@stephancb](https://discourse.julialang.org/u/stephancb)\
**Post date:** [October 5, 2022, 11:56am UTC](https://discourse.julialang.org/t/how-do-frequencies-shift-after-a-fft/88089/5 "2022-10-05T11:56:58Z")

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[Here](https://discourse.julialang.org/t/why-are-the-return-values-of-fft-and-fftfreq-so-terrible/87510) is a recent thread with similar discussion.

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_[View the full topic](https://discourse.julialang.org/t/how-do-frequencies-shift-after-a-fft/88089)._