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Subject: Re: implementing an fft (fast fourier transform)
From: Linus Nielsen Feltzing (
Date: 2003-04-24

Jaremy wrote:
> I am currently developing a fast fourier transform (fft) for rockbox.
> For those who do not know what a fft does, it transforms data about the
> amplitude into information about the frequency spectrum.

We can't read the D/A converter data fast enough to make use of an FFT
for spectrum analysis. For a good analysis you would need to sample the
data at about 40kHz. The best we can do is about (wild guess) 0.5kHz.
And then Rockbox will slow to a crawl.

My conclusion is: don't bother.

Sorry if I sound pessimistic.


Page was last modified "Jan 10 2012" The Rockbox Crew