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02-22-2017, 04:16 AM
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#1
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Human being with feelings
Join Date: Jan 2008
Location: Padova, Italy
Posts: 471
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ReaEQ's low pass filter changes with sampling rate
Just noticed this today on a mastering session involving ReaEQ.
I switched sampling rate from 48KHz to 96KHz (for other reasons) and heard sound becoming duller. Than I found that Low Pass filters in ReaEQ change steepness with samplerate. This is clear on the graph AND soundwise.
http://forum.cockos.com/attachment.p...1&d=1487761894
http://forum.cockos.com/attachment.p...1&d=1487761900
Is this an expected behaviour?
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02-22-2017, 05:17 AM
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#2
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Administrator
Join Date: Mar 2007
Location: NY
Posts: 15,749
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For filters that affect frequencies near the Nyquist frequency, in other words exactly the situation you are describing, yes this is expected behavior.
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02-22-2017, 05:31 AM
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#3
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Human being with feelings
Join Date: Jan 2008
Location: Padova, Italy
Posts: 471
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Thank you Schwa. After you answered I've tried with some third party plugins and they show same behaviour. Difference is subtle until you use a steep filter, where the effect is dramatic.
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02-22-2017, 06:01 AM
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#4
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Human being with feelings
Join Date: Oct 2015
Posts: 739
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Oversampling would solve this. You can try with Meldaproduction EQ which has oversampling.
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02-22-2017, 06:33 AM
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#5
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Human being with feelings
Join Date: Jun 2009
Location: Croatia
Posts: 24,790
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+1 for oversampling in ReaEQ
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02-22-2017, 11:01 AM
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#6
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Human being with feelings
Join Date: Mar 2010
Location: Adelaide, South Australia (originally from Geelong)
Posts: 5,598
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Quote:
Originally Posted by EvilDragon
+1 for oversampling in ReaEQ
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Another +1 to this long standing FR.
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02-22-2017, 11:22 AM
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#7
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Human being with feelings
Join Date: Jun 2012
Location: Spain
Posts: 7,239
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if you work at 96Khz you shouldn't need oversampling, should you? I want to understand why schwa said it is the expected behaviour, and to understand why oversampling would solve this.
@phonofranz, duller when it is at 96Khz? based on your images, I think it would be duller at 48Khz.
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02-22-2017, 12:43 PM
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#8
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Administrator
Join Date: Mar 2007
Location: NY
Posts: 15,749
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A low pass filter @ 15kHz has relatively little effect if the sample rate is 48kHz; at that sample rate the maximum theoretical frequency that can be represented at all is 24k so the filter just doesn't have much to work with. At 96kHz, a 15kHz filter has a much more significant effect. Oversampling would cause the 48k signal to be processed more like the 96k signal. Oversampling the 96k signal would be overkill.
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02-26-2017, 07:28 AM
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#9
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Human being with feelings
Join Date: Nov 2010
Location: Mullet
Posts: 829
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Quote:
Originally Posted by EvilDragon
+1 for oversampling in ReaEQ
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Thankfully there are hundreds of other EQ's on the market which have oversampling already.
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