Demonstration of linear filtering with DFT

In this program we demonstrate linear filtering operation using DFT.
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Updated 1 Nov 2018

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In this program we demonstrate linear filtering operation using DFT. We take sine waves of different frequencies, and plot them. Then we mix all the sine waves to make a composite signal. We take DFT of the composite signal and plot it to show that all the frequencies are present. Then we multiply a mask to the DFT signal to filter the signal. Then we take IDFT and again plot the filtered signal. The plot demonstrates that indeed the signal has been filtered. A low pass filter is implemented in the example.

The program will be beneficial for undergraduate students.

I will update the program with labels for figures and remarks/comments on the code in short time.

Cite As

Dr. Deepak Kumar Rout (2024). Demonstration of linear filtering with DFT (https://www.mathworks.com/matlabcentral/fileexchange/69289-demonstration-of-linear-filtering-with-dft), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2016b
Compatible with any release
Platform Compatibility
Windows macOS Linux

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Version Published Release Notes
1.0.0