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digital pre-amp

Eike Behrendt

September 07, 2020 13:12

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Can I build something like a streaming digital pre-amp with the RPi 4b?

 

I want to use the RPi primarily as a streamer for Roon, with AES-EBU via XLR out to my studio monitors. For this, there are AES hats like PI2AES, and Ropieee. 

 

However, I also want to play sound from my TV via the studio monitors, so I need a way to connect also my TV, maybe by the TV's optical Toslink output. Could I somehow control the source selection (music streaming or TV sound), like in a digital preamp?

 

The Hifiberry DAC+DSP board has Toslink in. Could I direct that to the digital output, and somehow convert to AES out?

 

Would that digital output be volume controlled? And how could I control the volume for the TV? Could I use the remote of my Samsung TV, or maybe use the Flirc remote USB dongle? 

 

I could always just buy a RME ADI-2 PRO, but I would love to go the Raspberry path, if possible. 

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5 comments

• 0
  
  HiFiBerry team September 08, 2020 12:40

  The DAC+ DSP can route TOSLink input to TOSLink output. Depending on the DSP program you're using, you can also volume-control it. In the DSP profiles that we provide, Digital output volume is fixed. However, you can create your own DSP program that can do volume control on the SPDIF output. Just note that creating DSP profiles is not something we would recommend to beginners.
  
  https://github.com/hifiberry/hifiberry-dsp/tree/master/doc

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  Domenico Guerra September 08, 2020 13:46

  i use dac+ dsp 10  profile ( standard) 

  and

  digital output volume is controlled by interface or remote command of PI ( your remote) 

   

   

• 0
  
  HiFiBerry team September 08, 2020 13:46

  Ooops, I thought this was mapped directly.

• 0
  
  Eike Behrendt September 08, 2020 14:06

  Sounds like there is a solution, but I would need deep know-how to implement it?

  Is there a way to select sources, so to switch from Roon music streaming to TV sound as a source?

   

   

• 0
  
  HiFiBerry team September 08, 2020 14:07

  HiFiBerryOS automatically switches to SPDIF input if a signal is detected.