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[Signal PKG] limited slope

From: Renato S. Yamane
Subject: [Signal PKG] limited slope
Date: Thu, 14 Dec 2017 08:39:08 +0100


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:

Detail: when I use a crest factor of 12dB instead 6dB, I donĀ“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,

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