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Re: freqz issue

From: Laurent HAAS - F6FVY
Subject: Re: freqz issue
Date: Fri, 10 Jan 2020 15:26:20 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Thunderbird/60.9.1

Hi Kai et al.

Thanks for your reply.

Le 10/01/2020 à 03:09, Kai Torben Ohlhus a écrit :

I am a bit lazy to go deep into your issue (not my domain), but a
minimal working example would be

   y = ones (1, 5000);

Thus what is the `y` you are trying to work with?

y are I/Q sample (complex) from a radio receiver.

And your basic example, opened my eyes.

Apparently, at least when plotting spectrum, Octave freqz can *only* use real data (not complex), while Matlab freqz can handle complex data, and plot correct spectrum (not symetrical around DC).

Being a total newbie in Octave, I can't say if it has to be considered as a known limitation of Octave, or a bug concerning "Matlab compatibility ? I couln't find any bug report about that.

In all cases, the spectrum output can't be plot identically to Matlab this way.

Thanks again and rgds



I never lose. I either win or learn - Nelson Mandela

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