Indeed it's due to the oversampling filters. Try 'eco' to see the response phase shift free.Aleksey Vaneev wrote:That's the problem with the analyzer. What you see in both cases (it seems) is called linear-phase response. If it was a group delay plot you would see a straight line. Phase response plot is generally a hardly reasonable measurement of filter's sound. But it is simple to plot, of course.
It is not necessarily due to oversampling. A simple sample delay will produce a similar plot (if you won't do a compensation). And, of course, any linear-phase filter will produce a similar plot as well.Christian Budde wrote: Indeed it's due to the oversampling filters. Try 'eco' to see the response phase shift free.
Right, but in my case it's because of the polyphase oversampling filter, which introduces some delay which leads to this behaviour. These kind filters seem to be very popular nowadays (ok, my girlfriend hates them or at least if I talk about them. For her that are huge monsters with thousand tentacles, muahhhahaaaa)Aleksey Vaneev wrote:It is not necessarily due to oversampling. A simple sample delay will produce a similar plot (if you won't do a compensation). And, of course, any linear-phase filter will produce a similar plot as well.Christian Budde wrote: Indeed it's due to the oversampling filters. Try 'eco' to see the response phase shift free.
Christian Budde wrote:These kind filters seem to be very popular nowadays (ok, my girlfriend hates them or at least if I talk about them. For her that are huge monsters with thousand tentacles, muahhhahaaaa)
I guess PLParEQ simply doesn't have oversampling. Also the filter is applied in a different manner (if I remember correctly). The filter is "rendered" in the frequency domain which is put into a huge FIR filter (basically an impulse response which is used by a convolution engine). I think CurveEQ works similar, and in Linear/Maximum- Phase Mode Electri-Q can work the same. If you select the "S-Plane" filter types you can even achieve the perfect bell symmetry (which usually isn't the case for digital filters).mustgroove wrote:PLParEQ does not give a similar plot, that was part of the reason for me posting this thread...
it does.Christian Budde wrote:I guess PLParEQ simply doesn't have oversampling.mustgroove wrote:PLParEQ does not give a similar plot, that was part of the reason for me posting this thread...
In version 1.5.2 only in linear/maximum- phase mode -> "S-Plane"defjamm wrote:edit: i can't find those 's-plane' filters?
In the version I made public there is no way to manually change the delay used for analysing. If the plugin reported 64 samples although it has about 65 samples, then you will find at least one phase wrap. I should have enabled the "group delay" view. Delay is sometimes easier to understand then phase.leban wrote:In my opinion that curve is linked to the plug-in delay (even if already compensated). For example, Waves L2 has the same curve as a generic plug with 64 samples delay. I don't think Waves is making upsampling for a limiter plug. I sent a mail to christian about 5-6 months ago for this subject. In my opinion L2 doesn't change phase. It changes gain only, after 64 samples of look-up ahead.
yes, but your analyser says that plug reports correctly all the samples. Infact L2 has no delay on cubase sx!Christian Budde wrote:In version 1.5.2 only in linear/maximum- phase mode -> "S-Plane"defjamm wrote:edit: i can't find those 's-plane' filters?
In the version I made public there is no way to manually change the delay used for analysing. If the plugin reported 64 samples although it has about 65 samples, then you will find at least one phase wrap. I should have enabled the "group delay" view. Delay is sometimes easier to understand then phase.leban wrote:In my opinion that curve is linked to the plug-in delay (even if already compensated). For example, Waves L2 has the same curve as a generic plug with 64 samples delay. I don't think Waves is making upsampling for a limiter plug. I sent a mail to christian about 5-6 months ago for this subject. In my opinion L2 doesn't change phase. It changes gain only, after 64 samples of look-up ahead.
Kind regards,
Christian
Have you restarted the measurement? Or are you using the Phase reduced filters? The basic 'eco' settings with normal filter types don't any delay and thus shouldn't produce any phase wrap.mustgroove wrote:I can also confirm that engaging "econ" mode does not change significantly change the phase behaviour shown above... it's still wildly all over the place...
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