Aliasing Exposed: Confronting Unwanted Harmonic Artifacts (Pure Data Demo) | Simon Hutchinson

A quick demo of aliasing in Pure Data.
Aliasing (or "foldover") is unwanted frequencies created by sampling a sound below its Nyquist Rate. I talk about digital sampling and sample rate in more detail in another video ( • Sample Rate, Nyquist T... ), but, in this video, I wanted to revisit aliasing specifically, demonstrating how these frequencies are created.
#digitalaudio #aliasing #Nyquist #puredata
0:00 Defining aliasing
1:05 The patch
2:32 Demonstrating aliasing
4:21 Changing the sample rate
6:21 So what?
More digital audio concepts: • Digital Audio Concepts...
Subscribe for new videos every week: ua-cam.com/users/SimonHut...
All my videos are fueled by coffee. You can buy me one here: ko-fi.com/simonhutchinson
Follow me:
Official Website - simonhutchinson.com/
Twitter - / cybrshutchinson
facebook - / simonhutchinsoncomposer
itch.io - simonhutchinson.itch.io/
Soundcloud - / simon-j-hutchinson
I’m a composer, sound-designer, and new media artist trying to bring a global perspective to music technology. This channel contains performances, experiments, and instructional videos for artists and audiences searching for new ideas and avenues of musical expression.

[@selmosian]

awhhh i miss PD! thank you for reminding me!

[@SimonHutchinson]

Any time!

[@jonhille]

nice, even though i don't use PD i learned something

[@telemechanical]

Not sure if I can "like" this video what with all the high-pitched sine waves, but it's a very clear demonstration.

[@casim8842]

Nice clarity and brevity. An old tutor always told me, just throw a low pass filter on your outputs, you'll be fine. Do you agree?

[@SimonHutchinson]

Thanks! Maybe on the filter. It depends on what you're trying to do, but throwing in that anti-aliasing filter might be a good solution if you're having issues.