And how is it one? What is your definition of aliased signal?How is a stair-stepped ZOH signal from a DAC not the exact definition of an aliased signal?
Linear phase EQ is debatable. Especially correction for room modes you can do minimum phase. That’s what the room modes are anyway. Or use some software to linearize phase separate from frequency response.No upsampling in JRiver. Linear phase EQ, Limiter with no oversampling. Updating IFI Zen V2 with GTO filter.
You know what. I'll concede my defeat. That makes sense. I was under the impression that ZOH before a reconstruction filter would itself create signal nulls (aliasing) near the upper limit of the sample rate.And how is it one? What is your definition of aliased signal?
Aliasing is when a high frequency signal becomes indistinguishable from a low frequency signal (during AD process or during downsampling) and effectively becomes the low frequency signal. You know, it gets a false name, an alias. After that the original low frequency signal can't be recovered anymore.
And here, with ZOH, we have a low frequency signal being copied, or imaged, as high frequency signal and staying its own thing. And the original low frequency signal stays intact (modulo slight roll-off caused by ZOH).
Here's white noise, band-limited to 20 kHz (in attachment), upsampled and downsampled:In my poor understanding: 48kHz upsampled to 384kHz downsampled to 48kHz = distortion. Am I right? Please correct me.
sox "noise-20k.flac" "up.flac" rate -v 352800
sox "up.flac" "down.flac" rate -v 44100
sox -m -v1 "noise-20k.flac" -v -1 "down.flac" "null.flac"
sox "null.flac" -n stats
[...]
Pk lev dB -138.47
RMS lev dB -172.13
RMS Pk dB -165.73
RMS Tr dB -196.32
Yep, works at dcs, should know better. Wrong terminology is still wrong. It is common, but wrong.
You’re introducing nonlinearity with that limiter and multiband compressor afaik. A little is ok but I am under the impression that you can introduce harmonic distortion with dynamics processors which can manifest itself as aliasing.I apologise for my weak understanding in this regard... But I can't resist myself to get a little bit more air (using Fabfilter Pro Q3)... tight bass (using Fabfilter Pro MB) and clip protection without loosing openness (using Fabfilter Pro L2) in my musics. That's all I want without introduce pre-ringing and distortion.
Could be solved with linear EQing?You’re introducing nonlinearity with that limiter and multiband compressor afaik. A little is ok but I am under the impression that you can introduce harmonic distortion with dynamics processors which can manifest itself as aliasing.
By “adding air” You’re also slightly reducing the headroom and pushing your signal toward clipping. If you’re pushing up the top on modern masters, compressing the bass and chopping peaks with a limiter, you’re adding distortion.
not all room effects are min phase. Peaks are usually min phase and dips are not.Linear phase EQ is debatable. Especially correction for room modes you can do minimum phase. That’s what the room modes are anyway. Or use some software to linearize phase separate from frequency response.
How are they not? Stuff can't go back in time...not all room effects are min phase. Peaks are usually min phase and dips are not.
thanks for saving me from trouble of explaining it.Comb filter effects are very typically linear phase phenomena. And no, FIR filters don't require a time machine to operate, they have latency.
If pre-ringing is audible or not depends totally on the filters applied, it's not contingent on oversampling.Is it necessary to enable oversampling in Fabfilter Pro MB to mitigate pre-ringing in Linear Phase mode processing?
Interesting association but no. Nonlinearity has to do with the waveform going in as one shape and coming out a different one via a transfer function. I think this video goes into it:Could be solved with linear EQing?