[AudioI] Octo Sound Card

[Matt Flax]

Hi Sam,

Are you using multichannel inputs for estimating ANC ? How are you 
measuring and designing your ANC filters ? What is your current approach 
for C++ and audio ?

We can chat about your current approach for C++ and audio  if you like.

One approach I like to use is available in the gtkiostream software. 
gtkiostream has some C++ abstractions of the ALSA libasound2 API : 
https://github.com/flatmax/gtkiostream/tree/master/include/ALSA

Specifically for the Octo, there is also some code on ensuring channel 
alignment on the input, it also demonstrates how to use the ALSA C++ 
classes : 
https://github.com/flatmax/gtkiostream/blob/master/test/ALSAFullDuplexMinScan.C#L49-L77

gtkiostream also has FIR and IIR filters implemented : 
https://github.com/flatmax/gtkiostream/tree/master/include/DSP

They may be of interest to you. An example of using the FIR class is in 
this test file : 
https://github.com/flatmax/gtkiostream/blob/master/test/FIRTest.C

An example of using the IIR class is in this file : 
https://github.com/flatmax/gtkiostream/blob/master/test/IIRTest.C

Matt

On 21/4/22 15:43, Samuel Taylor via People wrote:
> Hi Everyone,
>
> I’m currently working on a research team and we’re trying to utilize the octo sound card for active noise canceling hardware. I’m having difficulty with programming the hardware (accessing the hardware through high level code such as c++) the syntax and requirements are stumping me. If there is anyone willing to communicate more with me on the topic that has some expertise with this i would love to correspond and learn from you.
>
> Thanks in advance,
> Sam Taylor
>
> Samktaylor21 at gnail.com
>
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