morillon
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helloThe digital tests could be made in a different way, maybe more easy and even more accurate.
1. Generate a 1 kHz 24 bit ditherd sine, send it out via USB to SPDIF. Use one of your ADI-2s to receive and record that signal. Analyze the recording (or do it all in realtime with Multitone). The result should be a FFT of a 1 kHz sine full scale with a horizontally smooth and linear noise floor at about -180 dBFS, and nothing else. Any kind of bit mangling would show artefacts here.
2. Use DeltaWave to compare the original file (the played sine) with the recorded file. They should cancel 100%, proving bit accuracy.
3. In case you have any RME interface other than ADI-2 Pro/DAC you can use DIGICheck to see the Channel Status content of the DUT's SPDIF output, that way verify if that channel status includes wrong information (copy protection, bit length, sample rate, channel number, emphasis etc). Unfortunately this is a DIGCheck feature that due to technical reasons is not supported by the ADIs (they instead show Professional or Consumer status and Emphasis of the incoming signal directly on screen).
4. You could have used Bit Test to send out via your DUTs into the ADIs.
Just brainstorming...
Regards
Matthias Carstens
RME
the opportunity for a small question
on your machines.
is it possible to limit as much as possible, see "disengage" (in digital inputs) all processing of reclocking-improvements etc to allow a sufficiently "explicit" measurement-observation of "digital in the digital domain"...?
thank you
;-)