[PD] downsampling with [block~] causing artifacts

Alexandre Torres Porres porres at gmail.com
Fri May 15 19:18:45 CEST 2015


Howdy, I have a patch attached to show how downsampling produces
artifacts/distortion for a 440 sine wave. I don't hear "aliasing" and I
think it couldn't be foldover at all because 440 is below the nyquist.
Moreover, I hear harmonic higher pitches - so it seems like a harmonic
distortion from the original sine wave that I can also still perceive. This
kind of distortion happens when you have a reduced dynamic range.

Another things is that I heard someone saying how increasing sample rate
improves dynamic range, but I can't find this information around. Not sure
it it's really true, if someone says it is so, please send me a source, ok?
But the thing is that the artifacts from this patch could be the result of
a smaller SNR.

Hope you can help me sort this out.

thanks
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20150515/9575968d/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Downsampling.pd
Type: application/octet-stream
Size: 742 bytes
Desc: not available
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20150515/9575968d/attachment.obj>


More information about the Pd-list mailing list