[Scilab-users] Plotting properties of digital audio filters

[Rafael Guerra]

Hi,
 
Assuming sr=5e-5 s, Scilab 5.5.2 gave me the following phase plot:
 

 
Regards,
 
Rafael
 
-----Original Message-----
From: users [mailto:users-bounces at lists.scilab.org] On Behalf Of fred_audio_dsp
Sent: Sunday, December 13, 2015 6:22 PM
To: users at lists.scilab.org
Subject: Re: [Scilab-users] Plotting properties of digital audio filters
 
Hi,
 
By making the FFT size of the form 2*2^x, I managed to get more of an
expected result.
 
Still the phase response of the filters I analyze drops off to -180°
unexpectedly, as illustrated in the plot below (without frequency vector
applied because I'm just testing). This is a peak filter, -3dB at 500Hz, Q=1.
Note that any kind of phase unwrapping did not produce any different result.
 
< <http://mailinglists.scilab.org/file/n4033215/plot3.png> http://mailinglists.scilab.org/file/n4033215/plot3.png> 
 
I have included a zip file of the captured impulse response.
response.zip < <http://mailinglists.scilab.org/file/n4033215/response.zip> http://mailinglists.scilab.org/file/n4033215/response.zip>  
 
Regards,
 
Frederik
 
 
 
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