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Re: different results in fft of an chirp in matlab and octave


From: Mike Miller
Subject: Re: different results in fft of an chirp in matlab and octave
Date: Wed, 7 Mar 2018 13:33:39 -0800
User-agent: Mutt/1.9.3 (2018-01-21)

On Wed, Mar 07, 2018 at 14:47:54 +0100, Dietmar Warning wrote:
> can anybody help me to find out why I get different results by
> plotting the fft results of a 800 ... 50kHz chirp Signal in matlab and
> octave.
> 
> Please see the attached screenshots and the used script. It looks for
> me that the behaviour in low frequency end is more reasonable in
> matlab.

Yes, this is likely an error in the Octave chirp function with the
"logarithmic" option. It would be very helpful if you could file a bug
with your example showing the difference at
https://savannah.gnu.org/bugs/?group=octave&func=additem

-- 
mike

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