Re: [Signal PKG] limited slope

[Robert T. Short]

On 12/13/2017 11:39 PM, Renato S. Yamane wrote:
> Hi,
>
> Regarding the code below, someone have an idea why I have this limit
> in low frequencies?
>
> Please, see the frequency response on image available in: https://ibb.co/cgwOqG
>
> Detail: when I use a crest factor of 12dB instead 6dB, I don´t have
> this problem.
>
> ==============
> pkg load signal;
> pkg load ltfat;
>
> sampling_rate = 44100;
> lenght = 30;
> hpf = 400;
> lpf = 4000;
> crest_factor = 6;
>
> typenoise = noise((lenght)*sampling_rate, 1, 'pink');
> [b,a] = butter(2, [hpf/(sampling_rate/2), lpf/(sampling_rate/2)]);
> filtered = filter(b, a, typenoise);
> filtered = filtered / (rms(filtered) / 10^(-crest_factor/20));
> audiowrite ('signal.wav', filtered, 44100);
> ==============
>
> Best regards,
> Renato
>
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I don't get the same spectral plots you show here.  My results are much 
more like your "expected" slope.