Acoustica PE 7.4.7 - problems with "Remove DC Offset" and a wish.

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korobkoff wrote: Sat Dec 24, 2022 5:49 pm
Tj Shredder wrote: Sat Dec 24, 2022 12:36 pm
Thank you for trying to help not only with words, but also with deeds. Please accept my respect!
But unfortunately, your plugin, like many other plugins I have previously tested, makes significant phase changes up to 5.5 kHz, and below 500 Hz - quite strong.
It is in this sense that the instrument from Acoustica is flawless - no phase changes, and in Acon Digital Equalize 2 phase changes do not go beyond 30-35 Hz.
Thanks for testing. Did you run it on a Mac or on Windows?
And I am curious, how do you measure phase changes? Any specific plugin?
Of course that highpass is the most primitive possible, I would have to read up on filters which don‘t change the phase…

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Tj Shredder wrote: Sat Dec 24, 2022 7:39 pm Did you run it on a Mac or on Windows?
Windows.
Tj Shredder wrote: Sat Dec 24, 2022 7:39 pm And I am curious, how do you measure phase changes? Any specific plugin?
No, with the help of any audio editor - I have already described earlier in this topic: you need to apply the plugin being tested and invert the phase of the resulting result, after which mix paste it into the original version. What has not changed in combination with its opposite phase will give silence; what has been removed by the plugin will remain unchanged; what has changed in another way will have an intermediate intensity.
I am sure that with special plugins it is possible to get more accurate unambiguous results, but I think that for this particular case, what I have described is enough.

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korobkoff wrote: Sat Dec 24, 2022 10:52 pm
Tj Shredder wrote: Sat Dec 24, 2022 7:39 pm Did you run it on a Mac or on Windows?
Windows.
Tj Shredder wrote: Sat Dec 24, 2022 7:39 pm And I am curious, how do you measure phase changes? Any specific plugin?
No, with the help of any audio editor - I have already described earlier in this topic: you need to apply the plugin being tested and invert the phase of the resulting result, after which mix paste it into the original version. What has not changed in combination with its opposite phase will give silence; what has been removed by the plugin will remain unchanged; what has changed in another way will have an intermediate intensity.
I am sure that with special plugins it is possible to get more accurate unambiguous results, but I think that for this particular case, what I have described is enough.
Ok, a null test. As my higghpass is working in real time, I can also make a null test in real time. Made a second even more simple plugin (to be able of knowing what it does) which inverts the phase...
If I place the DCBlock and the PhaseInvert into a layer in Bitwig and feed it with white noise. I do get the 0.5 Hz of DC and remaining noise of inaudible -60 to - 100 dB. Absolute perfect for what its needed for... I hear nothing at all, though it could kill my speakers...
If you listen to a track, it remains perfect to my ears...

You seem to rely more on measurable than audible artifacts...

I read up on zero-phase filters. It could be done in non-real time. And I would prefer a zero-phase high pass of 1Hz or 2 Hz over the current method...

The real time spectrum analysis is limited as well, I need to set it to very high resolution to get a useful display in the low range. The lowest frame displays all what is happening between 0 and probably more than 20Hz thus contains the DC...
https://www.dropbox.com/s/9jjeahcjedgca ... t.zip?dl=0
Bildschirmfoto 2022-12-25 um 07.11.29.png
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Tj Shredder wrote: Sun Dec 25, 2022 6:23 am You seem to rely more on measurable than audible artifacts...
Oh yes, I already wrote above that the reason for this discussion is my perfectionism. The artifacts of the instrument from Acoustica are also difficult or impossible to determine by ear (below -70 dB).

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A real time 1 Hz highpass with zero phase would have a latency of 1 second. In an audio editor like Acoustica that wouldn‘t be a problem, in a DAW you would avoid that…

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That's why I undertook the search, because I don't need realtime, I thought I would find something that works, albeit for a long time, but exceptionally high quality.

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