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different results in fft of an chirp in matlab and octave

From: Dietmar Warning
Subject: different results in fft of an chirp in matlab and octave
Date: Wed, 7 Mar 2018 14:47:54 +0100 (CET)

Dear octave user,

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.

Any hint is appreciated

Dietmar

Attachment: matlab_chirp_fft.png
Description: PNG image

Attachment: octave_chirp_fft.png
Description: PNG image

Attachment: test_chirp_fft.m
Description: Binary data

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