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Dac+Dsp profiles and SPDIF input

Cedric MARIOT

January 01, 2021 12:36

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Happy New Year !

Since the last HBOS version, I'm fighting with DSP profiles, sound quality and SPDIF input for TV Sound. (PI4, DAC+DSP hat, Analog output to old marantz ampli)

- Version 12 is working well, SPDIF is active when TV is ON, but music 'DLNA' sounds metallic and flat.
- Version 11 has a great sound, but SPDIF input is never going active.

So, I tried to make my own profile from v11 and replacing some SPDIF data by v12 ones:

<metadata type="enableSPDIFTransmitterRegister">4749</metadata>
<metadata type="sensitivitySPDIFRegister">51</metadata>
<metadata type="enableSPDIFRegister" storable="yes">4752</metadata>
<metadata type="readSPDIFOnRegister">54</metadata>

But SPDIF remains inactive :-(

Any idea ? Or alternative profile ?

KR,
Cédric.

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10 comments

• 0
  
  HiFiBerry team January 01, 2021 19:55

  That won't work at all. You can't simply add metadata from another version as programs are different and will have different addresses. If you want to create a new DSP profile, you need to use SigmaStudio:
  https://github.com/hifiberry/hifiberry-dsp/blob/master/doc/dspprofiles.md

• 0
  
  Cedric MARIOT January 01, 2021 21:15

  I understand my failure with Metadata. I will take a look to SigmaStudio to create/modify profile.
  But, are you aware about this SPDIF issue ? Is it the good parameters to change to make v11 profile properly work ?

   

• 0
  
  HiFiBerry team January 02, 2021 05:02

  v11 had some bugs - including on SPDIF and therefore has been replaced by v12. Nothing else has changed and we don't see any "metallic" sound. We don'tr recommend to use older profiles anymore.

• 0
  
  Cedric MARIOT January 08, 2021 09:10

  Following your last response, I made more tests and here what I hear:

  - after reboot, v12 has the same good sound than v11, you are right !
  - after some hours without using it, no change
  - but, after watching TV, so using SPDIF input and back to Qobuz music throw mConnect+DLNA source, sound is flat again. So I restarted my hifiberry system and sound is great again.

  I have tested 5 times, always the same.

• 0
  
  Philipp September 20, 2021 17:03

  HiFiBerry team can you please upload the SigmaStudio file for version 12 into your github?
  Would appreciate that :-)

• 0
  
  HiFiBerry team September 20, 2021 18:21

  There is no such file as v12 was only a few register changes that have never been stored as a SigmaStudio file.

• 0
  
  Philipp September 21, 2021 05:42

  But wouldn't it be great to do so?
  You said v11 had some bugs, therefore V12 was the conclusion.

  Now one wants to start with SigmaStudio and your file, but has to find these bugs and changes by themself?

  Best regards

• 0
  
  HiFiBerry team September 21, 2021 05:45

  If you really want to create you own profile, just using one of the HiFiBerryOS profiles isn't really what we would recommend. Get a simple profile that you can understand easily. The HiFiBerryOS profiles are quite complex and probably not the best way to develop your own profile. What exactly are you planning to do?

• 0
  
  Philipp September 21, 2021 06:03

  The range of functions out of the box is enough for me at first. Personally, I only have to change the I2S setting of the output (e.g. eDAC) with regard to bit clock and framesync polarity, so that my amplifier works with the board (i verified that yesterday).
  
  No more, but to do that I need a SigmaStudio project, but with the v11 I also notice the problems because TOSLINK is my main input.

• 0
  
  HiFiBerry team September 21, 2021 06:30

  There is no problem with this in v11, the problem was only incorrect meta data in the DSP profile. You need to create the correct metadata anyway if you do changes in your project.