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    • Lindon
      Lindon last edited by

      OK so I have a convolution reverb in the fx rack (actually a whole bunch of them but that's another story)....

      The audio designer can hear distinct distortions showing up from the engine, these have reduced when we went from 24-bit IRs to 16-bit IRs, so it got me thinking perhaps we are creating these IRs all wrong...

      Whats everyones rule-of-thumb when making /using IRs ?

      We are "just" making/using 16-bit wav files ....is there anything else We should be doing?

      HISE Development for hire.
      www.channelrobot.com

      ustk 1 Reply Last reply Reply Quote 1
      • ustk
        ustk @Lindon last edited by

        @Lindon I haven’t used IRs in Hise seriously yet (essentially because I need to check the stereo/mono/quadri thing) But for reverberations, 16bit seems too low. This is exactly where using 24bits makes sense so why reducing the dynamic range in the first place?
        The distortion probably comes from a conversion that has been done without dithering… Be sure to check the True Peak value too.

        I cannot help pressing F5 in the forum...
        Studio427 Audio - Audio Instruments & FX Plugins for music production. Website - Facebook

        Lindon 1 Reply Last reply Reply Quote 0
        • d.healey
          d.healey last edited by

          I use 24bit 48Khz

          Libre Wave - Freedom respecting instruments and effects
          My Patreon - HISE tutorials
          YouTube Channel - Public HISE tutorials

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          • Lindon
            Lindon @ustk last edited by Lindon

            @ustk - hmm, seems logical - but experience is - he made them as 24-bit wav files - we loaded them and they distort MORE than the 16-bit ones...

            what do you mean by this?

            The distortion probably comes from a conversion that has been done without dithering

            What conversion?

            HISE Development for hire.
            www.channelrobot.com

            d.healey 1 Reply Last reply Reply Quote 0
            • d.healey
              d.healey @Lindon last edited by

              @Lindon Distortion with IRs is often due to a gain increase created by the IR. Can you send me some of the 24bit ones that cause issues for you?

              Libre Wave - Freedom respecting instruments and effects
              My Patreon - HISE tutorials
              YouTube Channel - Public HISE tutorials

              Lindon 1 Reply Last reply Reply Quote 0
              • Lindon
                Lindon @d.healey last edited by

                @d-healey - sure I will get him to send some of them over...thanks

                HISE Development for hire.
                www.channelrobot.com

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

                  @Lindon @d-healey's right, often the distortion doesn't come directly from the IR itself but for the convolution resulting in an over 0dB signal. Although a simple gain after the convolution will tell the truth about this.

                  Sorry I just misunderstood this:

                  these have reduced when we went from 24-bit IRs to 16-bit IRs

                  You said the distortions reduced from 24 to 16bits, but I heard the files have been reduced. My bad 🙂

                  When does the distortion happen? In the early reflections/transient only? On the whole file? The late tail only?

                  I cannot help pressing F5 in the forum...
                  Studio427 Audio - Audio Instruments & FX Plugins for music production. Website - Facebook

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

                    @ustk said in IR formats....:

                    @Lindon @d-healey's right, often the distortion doesn't come directly from the IR itself but for the convolution resulting in an over 0dB signal. Although a simple gain after the convolution will tell the truth about this.

                    Sorry I just misunderstood this:

                    these have reduced when we went from 24-bit IRs to 16-bit IRs

                    You said the distortions reduced from 24 to 16bits, but I heard the files have been reduced. My bad 🙂

                    When does the distortion happen? In the early reflections/transient only? On the whole file? The late tail only?

                    Well quoting the audio developer:

                    "The easy way to try it.. is run a sine wave. (Play low end like you would a sine bass) and you can hear all the harmonic distortion. - sounds like a waveshaper has been added into the IR engine...

                    Then for some reason, in Hise it adds a 19K spike of 12DB gain.. - although good luck hearing this"

                    HISE Development for hire.
                    www.channelrobot.com

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

                      @Lindon Hmm... Interesting...
                      Does it happen with IRs from another online bank for instance?

                      I cannot help pressing F5 in the forum...
                      Studio427 Audio - Audio Instruments & FX Plugins for music production. Website - Facebook

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

                        @ustk said in IR formats....:

                        @Lindon Hmm... Interesting...
                        Does it happen with IRs from another online bank for instance?

                        Not sure - but the very same IRs when used in other convolution reverbs sound fine.....

                        HISE Development for hire.
                        www.channelrobot.com

                        d.healey 1 Reply Last reply Reply Quote 1
                        • d.healey
                          d.healey @Lindon last edited by

                          @Lindon I'm not hearing any distortion when I use those IRs and a sine-wave gen. I did have to turn the wet down a bit with some of them to prevent clipping.

                          Do you have a couple of audio examples of what you're hearing in HISE (with distortion) and what you're hearing with another convo that doesn't have distortion? This way I'll have a better idea of what I should be listening for. It would be good if both demos are created with a sine gen so we can compare more easily.

                          Libre Wave - Freedom respecting instruments and effects
                          My Patreon - HISE tutorials
                          YouTube Channel - Public HISE tutorials

                          Lindon 1 Reply Last reply Reply Quote 0
                          • Lindon
                            Lindon @d.healey last edited by

                            @d-healey said in IR formats....:

                            @Lindon I'm not hearing any distortion when I use those IRs and a sine-wave gen. I did have to turn the wet down a bit with some of them to prevent clipping.
                            Do you have a couple of audio examples of what you're hearing in HISE (with distortion) and what you're hearing with another convo that doesn't have distortion? This way I'll have a better idea of what I should be listening for. It would be good if both demos are created with a sine gen so we can compare more easily.

                            • I will ask him.

                            HISE Development for hire.
                            www.channelrobot.com

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