Seeking Understanding: Artifact Analysis in Multiband Distortion
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Can anyone help me understand the artifact produced by distortion? I'm trying to create a multiband distortion and would like to understand what it is. The strong signal in the sub-frequencies is related to the type of distortion; what is this event called? Is it necessary to address it? Initially, I thought it was introduced because I didn't use oversampling, perhaps a DC offset?
I'm attaching a snippet to facilitate reading Script Node
HiseSnippet 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6XrU+K6wdDcCEYZ8eQn5QzoLJPWGKYmGsttVoiVquEpMixco.oKorxfkxWfQYYJGbXPX7Q2a3PXkgAgY5DCKBiGVDdHvJfnY5O50Cwnslo4IEUY2rE8zM5n38pxU4UdAz8Te.gcEO6dUjSeNmoUwH2h.6old+SH2hqh7upSuJxK0wWE46mwAfvgVpF1kLsIxhTNPcXgWYU+oMHNkMp07u3y+7exi3EgEJJIc5sEL8DH6r0JDKVXJUCgF8hOBdVnd4j6p46poi+pzJMAlMY22NCLYUC7J2JUYcaB6dLtJci76u0eWn3pj+C9M+4+8M2V0JKHWx3611YxN911oKtU1mdXcqrORu7h5+6ZoAyEFzbUwXZM5Vc1z3ADcvxjgwq.lh4TKq6TsT+lV6ZZXV8hlwSne.wwRKedh+WeaMZBspiiJ8R5rlNaxCH5DUaAysWIIO41rDd2a7B4NmWzJ40ODwgaDp+fHOcbGYM4SZ2QViXKTvk4SNR5e.BbiiivD2QN+k2ih6PqQwXTTMik4QtGEH6tfhUBLuMXWUkyg1k9bjFb2rWDV54nLY7Sp55HtW6nRu1w38ZGSzqcbwdsiK0qcb412QZjAtI7jZmHIsapM4evhCU88LJ89i9+CcXhzR 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@Mighty23 tried the snippet, I don't see any artefacts here, even with the same settings
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@DanH Thank you very much for your response. I'd like to ask if you've used a samplerate different from 48000 and a buffer size of 480.
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Sub frequency artifacts (most likely "pre-ringing") can be a result of linear phase filtering.
Dan Korneff - Producer / Mixer / Audio Nerd
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@Dan-Korneff What should I try to prevent or correct this?
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@Mighty23 said in Seeking Understanding: Artifact Analysis in Multiband Distortion:
@Dan-Korneff What should I try to prevent or correct this?
use a high pass filter set at 20Hz
HISE Development for hire.
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@Dan-Korneff Isn't pre-ringing a result of audio playing backwards?
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@Lindon Do you mean a low pass filter, as in preventing aliasing?
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@clevername27 Not that I know of. Playing the audio backwards is actually a possible solution to the issue.
In general, all EQ creates ringing. It usually occurs AFTER the signal, so it's masked most of the time. Linear phase filters create a ripple in the audio at the crossover points (aka: ringing) Due to the latency caused by linear phase filters, some of this ringing occurs before the transient and is now audible. -
@clevername27 said in Seeking Understanding: Artifact Analysis in Multiband Distortion:
@Lindon Do you mean a low pass filter, as in preventing aliasing?
no - several types of distortion approaches produce harmonics - in fact in a lot of cases this is what you want - but these can appear above your source freq. and below it, looking at the op's image there seems to be a low freq harmonic being added at around 20Hz, its a pretty simple High-pass filter to remove this.
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@Lindon said in Seeking Understanding: Artifact Analysis in Multiband Distortion:
ooking at the op's image there seems to be a low freq harmonic being added at around 20Hz
Does this undesirable occurrence associated with distortion have a specific term?
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