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Disable toslink in -> out routing

L G

April 22, 2022 15:18

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Hi,

I'm so new to HiFiBerry and the DSP topic, that I'm not even sure I can phrase my problem correctly. But I'll try my best.

I bought a DAC+DSP for the purpose of creating a Raspberry box that takes a toslink input, applies some filters (with Stereo Tools) and plays the modified sound on the toslink output. So, basically doing the DSP functions via software. Now, the problem I face is that whatever I send in through TOSLINK IN, goes out on TOSLINK OUT unchanged. If I understand correctly, this is due to the default programming of the DSP. How can I change this, so that the signal path is TOSLINK IN -> ALSA/JACKD+Stereo Tools -> TOSLINK OUT? 

Thanks.

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5 comments

• 0
  
  HiFiBerry team April 22, 2022 15:38

  You need to create your own DSP program using SigmaStudio:
  https://github.com/hifiberry/hifiberry-dsp/blob/master/doc/dspprofiles.md
  
  For a "dump" DSP profile that doesn't process anything, you might not even need to add metadata to the DSP profile.

• 0
  
  L G April 22, 2022 15:45

  Is there a minimum what such a dumb DSP program should contain? Or can it be completely empty?

• 0
  
  HiFiBerry team April 22, 2022 15:47

  You definitely need to route inputs and outputs correctly from and to the Pi. Also the DSP parameters need to be set correctly. Therefore, I recommend to use one of the DSP programs from Github to start with.

• 0
  
  L G April 22, 2022 16:37

  Is there any documentation on the routing attributes/parameters? I couldn’t find any details on github.

• 0
  
  L G April 22, 2022 19:11

  Never mind, I got it working. This helped a lot: https://support.hifiberry.com/hc/en-us/community/posts/360008515418-DAC-DSP-Toslink-input-to-RPI Thanks for the answers.