[Scilab-users] Plotting properties of digital audio filters

[Arvid Rosén]

Fred,

The first sample of your measured impulse starts with 0.0. That is, you have a delay of one sample in the system you are trying to identify (or maybe your input signal also starts with a zero). 1 sample of latency corresponds to 180 degree phase shift at the Nyquist rate, so it all looks reasonable to me. If you don’t want that, you can use detrend as Rafael sugests, or remove any leading zeros in your input data.

Cheers,
Arvid

> On 14 Dec 2015, at 01:41, Rafael Guerra <jrafaelbguerra at hotmail.com> wrote:
> 
> Fred,
> 
> I have detrended the phase spectrum before plotting but not sure that it is what
> you need.
> What result would you expect to obtain?
> 
> Regards,
> Rafael
> 
> -----Original Message-----
> From: users [mailto:users-bounces at lists.scilab.org] On Behalf Of fred_audio_dsp
> Sent: Sunday, December 13, 2015 9:33 PM
> To: users at lists.scilab.org
> Subject: Re: [Scilab-users] Plotting properties of digital audio filters
> 
> Hi Rafael, 
> 
> Would you mind sharing the code that produced these plots, or hinting at the
> method? 
> 
> Regards 
> 
> 
> 
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