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Re: Horrible aliasing

Posted: Sat Dec 05, 2020 1:34 pm
by andro
cherryaudio Greg wrote:
Tue Nov 24, 2020 11:16 pm
I suspect that your definition of "horrible aliasing" and theirs might differ.
I think aliasing is by definition horrible without the adjective.

I am writing some generator modules now and it takes an advanced knowledge of DSP (and a huge amount of work) to prevent oscillators from aliasing, which I regard as a primal sin. And indeed, as per the OP, I suspect many people do not have trained ears that can hear this junk for what it is and think it's some fat, desirable analog sound.

An example from the outside world is Bazille from u-he which I love in concept, but it has never been updated and aliases so badly all over the place that to me it is unusable as a synth. I think it was just an initial experiment.

Hoping you can fix it.

Andrew

Re: Horrible aliasing

Posted: Sat Dec 05, 2020 7:50 pm
by cherryaudio Greg
Hi,

Check out the next update, which should be ready within a week or two.

Greg

Re: Horrible aliasing

Posted: Fri Dec 11, 2020 10:14 am
by gentleclockdivider
Latest update installed
Osc sync aliasing issue is still there

Re: Horrible aliasing

Posted: Fri Dec 11, 2020 11:01 pm
by cherryaudio Greg
gentleclockdivider wrote:
Fri Dec 11, 2020 10:14 am
Latest update installed
Osc sync aliasing issue is still there
Hi,

What's the maximum modulation you're doing with TAL Mod? What's the range you're doing with CA2600?

Greg

Re: Horrible aliasing

Posted: Fri Dec 11, 2020 11:35 pm
by gentleclockdivider
Exactly the same as shown in the first post
I am not using any modulation at all , but just playing higher registers .
Sync slave osc is two octaves above the sync master ( both saw waves ) , now play higher notes and you hear the aliasing .
But even when both are the same it still happens
Modulation makes it worse

Here's another file , Sync master and slave have the same pitch , I will play the c for 4 octaves starting from c4
First part is cherry , second part is talmod ( talmod is clean as a whistle )
You can easily test this yourself since talmod has a demo version ( don't forget to set the subosc which is the syncmaster to +12 semitones , since it is tuned one octave below the others osc's )

https://app.box.com/s/eqgt2lafvdcbymlb6qwcdd1bg5kgtkxp

Re: Horrible aliasing

Posted: Tue Dec 15, 2020 12:46 pm
by haslo
Have you actualy upgraded? I tried to reproduce your results (hosted in Ableton 10 on Mac), and while my current CA2600 version still has more aliasing than the Talmod sample you provided, it's also much better than your CA2600 sample, and it also benefits from a higher host sampling rate (96k are much cleaner than 44.1k).

Edit, here's spectrograms of all three: https://photos.google.com/share/AF1QipM ... FrdGhIVE53

Edit: I've added a fourth image, which is the CA2600's oscillator without that sync, which produces absolutely no aliasing at 44.1k (just like Talmod, so the two pictures look almost identical). I also noticed that I hadn't switched off the reverb before, so the previous CA2600 images would be cleaner, too.

Re: Horrible aliasing

Posted: Wed Dec 30, 2020 12:55 pm
by gentleclockdivider
Just a saw ( osc 3 ) set to 2' or 4"' , synced to osc 2 (set to 16') makes it alias .
No rocket science
Result is and remains horrible
Changing internal sample rate to 96 Khz to reduce the aliasing simply proves it's bad dsp coding from the start .
It is what separates the good ones like talmod , u-he , cytomic , synapse audio which operate perfectly at 44khz from the bad ones ( cherry )

Re: Horrible aliasing

Posted: Thu Jan 07, 2021 1:06 am
by gentleclockdivider
Bump
Still waiting for better osc's when synced