What I found is, small USB audio dongles don't process low frequencies well because they use too small capacitors. This can be improved by DIY soldering. Also some of them do a bad job in noise shaping, leaving quantization noise in audible range. That is something you can't improve. Here is a page describing some of my findings:
http://www.katjaas.nl/audiodongle/audiodongle.html
Good old Griffin iMic is better than the dongles I tried. But it is nice to hack a dongle and make it a tiny bit better. Maybe it's time to design our own audio dongle.
Katja
On Tue, Oct 10, 2017 at 3:41 PM, Dan Wilcox danomatika@gmail.com wrote:
For those of you using RPI 3s with Pd, how is the audio performance using a standard stereo USB audio interface?
I'm talking simple, USB 1.1 full duplex at 16 bit, nothing fancy. No special RPI-only backpack boards or GPIO audio debs, just regular usb audio devices.
Dan Wilcox @danomatika danomatika.com robotcowboy.com
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