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Noise when optical input is tuned on but not active

David Stiles

December 05, 2021 23:43

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I want to raise an issue.  Not sure if it's hardware or software related.

I have an Amp100 with DSP optical input enabled and set to automatically switch-off other inputs. Optical input is connected to TV.

When streaming with DNLA or Spotify directly to HiFiBerryOS, I hear a crackling noise similar to a dusty needle on a turntable.  This is with TV turned off.   

If I then turn on TV and stream spotify to TV instead, HiFiberryOS switches to optical input and music plays without the noise.

If I turn off the optical input in sources, I can stream to HiFiBerry without noise.  This is a work around that is OK but takes away the convenience of automatically playing TV through Hifi speakers.

 

   

 

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6 comments

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  HiFiBerry team December 06, 2021 06:19

  Unfortunately this can happen if no real signal is sent via TOSLink. In this case, the only way is switch TOSLink on/off.

   

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  David Stiles December 06, 2021 07:32

  Thanks for your reply.  Is this something that can be fixed with software update in the future?

   

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  HiFiBerry team December 06, 2021 07:35

  Probably not as this is the behavior of the DSP.

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  David Stiles January 01, 2022 09:36

  Thanks. I have been noticing that a lesser amount of crackling continues when optical input is turned off. I seems to stop crackling after system restart. Is this normal?

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  David Stiles May 04, 2022 23:01

  Actually, I can confirm that crackling does continue with optical input disabled, even after after restart.

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  David Stiles May 13, 2022 12:44

  I have been running a Pi3B+ with this system (AMP100+DSP) and have suffered crackling and popping noises as above. 

  Today I upgraded to a Pi4 and now do not hear any crackling noise.   It seems ok, even with optical input turned on.  So there is an issue with with using aMP100 together with Pi3B+.  I note users have reported the same thing in other threads.