[PD] RPI 3 USB audio performance?

Dan Wilcox danomatika at gmail.com
Tue Oct 10 18:51:17 CEST 2017

Katja, that's some good research especially considering the size of those interfaces. I'm mainly sticking with larger boxes which have XLR and jack inputs.

How is the performance overall ala dropouts, latency, etc?

I ran into issues with RPIs before that simply could not handle asynchronous with a more pro-sumer USB audio interface, leading to constant dropouts when running full duplex. I'm mainly using older but very solid Roland boxes (UA-25 and UA-25EX) which are stereo duplex USB 1.1, fully standard USB audio compliant, and work with pretty much anything including my iPhone.

I'm asking as I'd rather not go through the process of setting up a new system on yet another embedded device and get *less* performance than with my 500 Mhz wearable 10 years ago. :)

> On Oct 10, 2017, at 5:49 PM, katja <katjavetter at gmail.com> wrote:
> 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 at 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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Dan Wilcox
@danomatika <http://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>

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