Extreme level peak from SqrOsc oscillator

ullyssen · Joined: Sep 22, 2017 Posts: 4 Location: everywhere

Hi!

I need some strange artifact to be removed from ChucK output.

I created the following code: simple function to control square oscillator:

gabbagabi · Posted: Fri Sep 22, 2017 8:17 am Post subject:

hi,
what ur using to measure?
may a soundcard oszilloskope?
if so soundcards often have caps on there inputs that could provoke this behaviour on square waves.

ullyssen · Joined: Sep 22, 2017 Posts: 4 Location: everywhere

blue hell · Posted: Fri Sep 22, 2017 9:20 am Post subject:

It looks like the anti-aliasing behaves a bit strange directly after initialization ... it might be easiest to apply some startup envelope to mask the effect ...

ullyssen · Joined: Sep 22, 2017 Posts: 4 Location: everywhere

blue hell · Posted: Fri Sep 22, 2017 9:59 am Post subject:

Sorry, I'm not able to do so ... but I could interpret your image Laughing

Maybe Antimon can come up with something? (when he is not too busy preparing for two shows to run ...)

ullyssen · Joined: Sep 22, 2017 Posts: 4 Location: everywhere

I've changed the code, so

Grumble · Posted: Mon Sep 25, 2017 3:09 am Post subject:

What strikes me as strange is that ringing occurs BEFORE a step of the signal as well as AFTER the step.
Shocked

blue hell · Posted: Mon Sep 25, 2017 5:15 am Post subject:

Heh, ringing before means that it is not ringing but bandlimiting instead being in effect.

blue hell · Posted: Mon Sep 25, 2017 5:17 am Post subject:

You can think of it being a square wave approximated by sines.