How do I implement dsp for 2.1 (full range L and R plus sub)

Plugins
1

I am hoping that this discussion might result in the implementation of 3 channel DSP which I hope is of interest to the community.

I want L+R on one USB out to DAC for full-range, and mono sub on second USB, I want to create system-wide crosover at 50hz with hignh pas and fir filters for fullrange, and lowpass for sub.
Since the RME DAC is only 2 channel, that leaves the sub to be connected with Minidsp or similar. Here is my cut of a block diagram. Has anyonr done this or is interested in this or could offer suggestions. The key issue is whether I could create a pipeline in Camilladsp to accomplish this while feeding 2 USB connectors. Clock synchronization is an issue.

image
image1008×668 27.4 KB

2

Hi Toni,

I think the current implementation of FusionDSP (@balbuze ) is limited to stereo.
there are some multichannel USB sound cards but I do not know if Volumio might access more than two channels at the same time.

The only way I could see a potential solution is to inject I2S stereo signal in some multichannel DSP card and make the channel separation + FIR/IIR correction on this DSP chip with some external software to program it.

I am afraid that within RPi/Volumio alone, it is dead.

Cheers,

Benoit

3

Exact and not exact…
FusionDsp is optimised for stereo but provides a pure CamillaDsp gui too for advanced users.
You can set as many channels you need but on the same multichannels DAC
No limit in this case!

4

Thank you all. I’ll pause for a bit on this. I have some technical background but this is stretching too far for me I think.