Steve on Image Processing

Results for: Fourier transforms

FFT Stories

Posted by Steve Eddins,

My last meeting of the day ended just a little while ago, and I was starting to think seriously about figuring out a blog post for this week. What to write about? That's when I happened to see that Cleve posted just yesterday about the FFT. Ah ha! I'll write about that, too (in honor of National Blog About the FFT Week).... read more >>

Plotting the DTFT using the output of fft 6

Posted by Steve Eddins,

In my Fourier transform series I've been trying to address some of the common points of confusion surrounding this topic. For today's espisode I want to look at how to use the fft function to produce discrete-time Fourier transform (DTFT) magnitude plots in the... read more >>

Negative frequencies 10

Posted by Steve Eddins,

I recently asked for your advice about how to continue my Fourier transform series. I appreciate all the enthusiastic and helpful responses. I'd like to continue focusing on some basic points that confuse folks who don't have an extensive signal processing background: ... read more >>

No units in the DTFT 4

Posted by Steve Eddins,

OysterEngineer (I love that name!) asked some interesting questions in response to my last Fourier transform post, which concerned the relationship between the discrete-time Fourier transform (DTFT) and the discrete Fourier transform (DFT). ... read more >>

The DFT and the DTFT 8

Posted by Steve Eddins,

It's finally time to start looking at the relationship between the discrete Fourier transform (DFT) and the discrete-time Fourier transform (DTFT). Let's look at a simple rectangular pulse, for . The DTFT of is: ... read more >>

Aliasing and a sampled cosine signal 22

Posted by Steve Eddins,

One challenge of teaching Fourier transform concepts is that each concept can be (and is) interpreted and explained in many different ways. It isn't always obvious how the different explanations for the same concepts are connected. ... read more >>

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