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    Seeking Understanding: Artifact Analysis in Multiband Distortion

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    • M
      Mighty23
      last edited by

      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?

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      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
      DanHD 1 Reply Last reply Reply Quote 0
      • DanHD
        DanH @Mighty23
        last edited by

        @Mighty23 tried the snippet, I don't see any artefacts here, even with the same settings

        DHPlugins / DC Breaks | Artist / Producer / DJ / Developer
        https://dhplugins.com/ | https://dcbreaks.com/
        London, UK

        M 1 Reply Last reply Reply Quote 0
        • M
          Mighty23 @DanH
          last edited by

          @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.

          1 Reply Last reply Reply Quote 0
          • Dan KorneffD
            Dan Korneff
            last edited by Dan Korneff

            Sub frequency artifacts (most likely "pre-ringing") can be a result of linear phase filtering.

            Dan Korneff - Producer / Mixer / Audio Nerd

            M clevername27C 2 Replies Last reply Reply Quote 0
            • M
              Mighty23 @Dan Korneff
              last edited by

              @Dan-Korneff What should I try to prevent or correct this?

              LindonL 1 Reply Last reply Reply Quote 0
              • LindonL
                Lindon @Mighty23
                last edited by

                @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.
                www.channelrobot.com

                clevername27C 1 Reply Last reply Reply Quote 1
                • clevername27C
                  clevername27 @Dan Korneff
                  last edited by

                  @Dan-Korneff Isn't pre-ringing a result of audio playing backwards?

                  Dan KorneffD 1 Reply Last reply Reply Quote 0
                  • clevername27C
                    clevername27 @Lindon
                    last edited by

                    @Lindon Do you mean a low pass filter, as in preventing aliasing?

                    LindonL 1 Reply Last reply Reply Quote 0
                    • Dan KorneffD
                      Dan Korneff @clevername27
                      last edited by

                      @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.

                      Dan Korneff - Producer / Mixer / Audio Nerd

                      1 Reply Last reply Reply Quote 1
                      • LindonL
                        Lindon @clevername27
                        last edited by

                        @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.

                        HISE Development for hire.
                        www.channelrobot.com

                        M 1 Reply Last reply Reply Quote 0
                        • M
                          Mighty23 @Lindon
                          last edited by

                          @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?

                          LindonL 1 Reply Last reply Reply Quote 0
                          • LindonL
                            Lindon @Mighty23
                            last edited by

                            @Mighty23
                            https://en.wikipedia.org/wiki/Intermodulation

                            HISE Development for hire.
                            www.channelrobot.com

                            1 Reply Last reply Reply Quote 1
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