• From: Oakland, California
  • Registered: 2021-06-21
  • Posts: 50

Topic: Undocumented SRC in Digiface USB?

As far as I can tell from the User's Guide and searches here in the forums, the Digiface USB does not feature a sample rate converter of any kind.

But when I set the Digiface USB to clock internally at either 48kHz or 96kHz and then connect my Sonos Port via a $10 coax-to-TOSLINK SPDIF converter, I get perfectly clean sound (from both the PHONES output and if saved to a file on my Mac) and the LED indicator and Fireface USB alternate between flashing/SYNC and solid/LOCK.

Can anyone please shed some light on why this works?

Thank you!

  • ramses
  • DAW Mastermind
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  • From: UTC+1
  • Registered: 2012-10-14
  • Posts: 12,866

Re: Undocumented SRC in Digiface USB?

Lock only indicates for a digital input, that a valid signal has been detected
Synch indicatres a valid and synchronous signal.

In such a setup without word clock or digital connection towards the external device you need to make the external device to a clock master.

It might work now because of SteadyClock ... but is not a stable connection or stable/recommended setup.

BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13

3 Reply by MC

  • MC
  • MC
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  • From: Germany/Thailand
  • Registered: 2007-04-06
  • Posts: 25,436

Re: Undocumented SRC in Digiface USB?

> Can anyone please shed some light on why this works?

It doesn't. You are just lucky to have no audible effect. Try to record a straight 1 kHz sine and check the waveform for glitches. They are there whenever the phase wraps.

Regards
Matthias Carstens
RME

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