DSP Robotics Support

I noticed this produces pretty severe distortion/aliasing on higher notes - any way to smooth that out?

Does this maybe only work best in blue?

Hi Kevin,

Try this one!

Good luck, BobF.....

Thanks for that - however I would describe the results as a mild improvement at the expense of noticeably duller sound.

Hi again Kevin,

Unfortunately aliasing is common in many distortion and wave shaping devices. If you missed this post read it over for possibly a little more help.

Reducing aliasing of waveshaping using convolution.

Try the conv tanh.fsm and see if it helps any better than the anti-aliasing filter I added.



And last, you could also remove some of the 1 pole low pass filters from the 36db anti-aliasing filter, they are each 6db. This could add a LITTLE punch back in.

Good luck and please let me know how you make out.

Take care, BobF.....

A 'convoluted' answer! - I'll give it a try.

Bob, unfortunately the 36 dB filter is just a simple filter its not anti-aliasing at all. You cannot remove aliasing by simply filtering the signal with a low pass filter, its not how it works.

A simple antialiasing technique consists in synthesizing the time integrated waveform and then numetically differentiate it. Example: a square wave is obtained by differentiating a triangle wave. The method is called DPW (differentiated polynomial waveform).

Easy for you to say!

My bad on the antialiasing filter, just found it in another schematic and well used it. Sorry!!!

Later then BobF.....

Hello all,

Had this laying around, so just thought I would add it for completeness.

Later then, BobF.....

@ Adam, it's fixed, very sorry!