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    Oversampling on convolution reverb

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    • T
      tomekslesicki
      last edited by tomekslesicki

      I noticed there’s an oversample node in the scriptnode view but I’ve got no idea how to implement that, especially since I never used the scriptnode features and the convolution files are swapped via the interface.

      LindonL lalalandsynthL 2 Replies Last reply Reply Quote 1
      • LindonL
        Lindon @tomekslesicki
        last edited by

        @tomekslesicki there was a long discussion here about Convolution reverbs and sample rates - try searching the forum.. I cant recall who it was... sorry.

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        • lalalandsynthL
          lalalandsynth @tomekslesicki
          last edited by

          @tomekslesicki i am very interested in this as well , i did see a discussion about sample rates changing the volume of the reverb as well, not sure if that was resolved ?

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          • T
            tomekslesicki
            last edited by

            Yeah, I've seen every thread that contained word 'convolution' by now. It's just that there seems to be no solution. @Christoph-Hart ?

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            • T
              tomekslesicki
              last edited by

              Ok, I think it has to do something with IPP. When I build HISE without it and then compile the plugin it seems to work fine.

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              • Christoph HartC
                Christoph Hart
                last edited by

                Can you send me the IR in question? IIRC @hisefilo also had a certain impulse response that triggered some issues with the first frequency bin in the FFT.

                hisefiloH 1 Reply Last reply Reply Quote 0
                • hisefiloH
                  hisefilo @Christoph Hart
                  last edited by

                  @Christoph-Hart Choosing Ooura FFT this fixed that issue. I can remember

                  // oninit
                  
                   const var ConvolutionReverb1 = Synth.getEffect("Convolution Reverb1");
                   
                   // Set the FFT type
                   // 0 = best available
                   // 1 = IPP
                   // 2 = Apple Accelerate
                   // 3 = Ooura FFT (slower fallback, but most portable)
                   ConvolutionReverb1.setAttribute(ConvolutionReverb1.FFTType, 0);
                  
                  lalalandsynthL 1 Reply Last reply Reply Quote 3
                  • Christoph HartC
                    Christoph Hart
                    last edited by

                    Ah nice, so I didn't fix the IPP version back then :)

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                    • d.healeyD
                      d.healey
                      last edited by

                      What about adding KISSFFT?

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                      • lalalandsynthL
                        lalalandsynth
                        last edited by

                        Is the convolution set to 0 " best available" as default ?

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                        • lalalandsynthL
                          lalalandsynth
                          last edited by lalalandsynth

                          Verfied , have aliasing here as well....maybe !

                          Although not sure that is aliasing I am at 96k and that makes no difference, guess I need to try another export with the Ooura ?
                          I dont get that 20K spike when using the same impulse in other reverbs
                          Impulse.jpg

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                          • lalalandsynthL
                            lalalandsynth @hisefilo
                            last edited by lalalandsynth

                            @hisefilo Are you referring to the aliasing issue by using Ooura ?
                            What does slower fallback mean and would you recommend just using the Ooura even though IPP has been recommended up to now ?

                            TESTING:

                            If i change the FFT type from 0, I lose the reverb and get some sort of room type doubling sound :)
                            Setting it back to zero does not help.

                            Setting it to 3 seems to get rid of most of the "Aliasing" , but I also lose the reverb so....hehe

                            MORE TESTING

                            Sine wave through Reaper Reaverb using my Impulse.
                            Sine 1.jpg

                            Same Sine , same impulse through my plugin.
                            Sine 2.jpg

                            I dont think its impulse specific as all my 90 impulses look like that .

                            Vocals through Reaverb.
                            Vocals.jpg

                            Vocals through my plug, same impulse.
                            Vocals 2.jpg

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                            • hisefiloH
                              hisefilo @lalalandsynth
                              last edited by

                              @lalalandsynth no aliasing on 0oura but IPP

                              Don't know details about the comments on the code I posted. It's old @Christoph-Hart magic! :)

                              lalalandsynthL 1 Reply Last reply Reply Quote 1
                              • lalalandsynthL
                                lalalandsynth @hisefilo
                                last edited by lalalandsynth

                                @hisefilo ok, but it does not seem to work for me , lose the reverb sound if I change the FFT mode.

                                I am going to test some more impulses , but I think its pretty clear that there is a problem.
                                My reverb plugin is just about ready :(

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                                • lalalandsynthL
                                  lalalandsynth
                                  last edited by

                                  @Christoph-Hart

                                  Any chance to get a fix for this?
                                  Was planning an impulse reverb as my first release. :)

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                                  • hisefiloH
                                    hisefilo @lalalandsynth
                                    last edited by

                                    @lalalandsynth an oversampled convolution node on scriptnode?

                                    lalalandsynthL 1 Reply Last reply Reply Quote 1
                                    • lalalandsynthL
                                      lalalandsynth @hisefilo
                                      last edited by lalalandsynth

                                      @hisefilo Oh, that is possible , does it behave in a similar way in terms of loading impulses etc or do I have to do everything over ?

                                      Will check it out.

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                                      • lalalandsynthL
                                        lalalandsynth @lalalandsynth
                                        last edited by lalalandsynth

                                        @lalalandsynth Quick test and that seems to work to get rid of the aliasing!
                                        8x oversampling, maybe even 2 x would be enough , now I just need to find out if I can replace those impulses on the fly or if the scriptnode impulse is meant to just sit there as an static impulse ?

                                        I suspect i cannot even get a reference for the Convolution Module in the scriptnode, is there some way to script the switching of impulses in scriptnode ?

                                        I can export the Convolution module as ccp and make the changing of impulses public i.e create a meta node but unsure of how to include the oversampling in that ?

                                        Man..if there was only a knob for the index.....sigh .

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                                        • lalalandsynthL
                                          lalalandsynth
                                          last edited by

                                          @tomekslesicki

                                          Check this out , seems to work .
                                          https://forum.hise.audio/topic/2652/scriptnode-oversample-node-starting-at-4x-crashes-in-pc/13

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                                          • lalalandsynthL
                                            lalalandsynth
                                            last edited by

                                            BTW, what does the "multithread option" do on the Convolution reverb ?
                                            Its not available on the Scriptnode Convolution so just wondering.

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