• Registered: 2012-05-01
  • Posts: 11

Topic: quad speed noise with HDSPe AIO

Connecting a sine wave generator to the analog input channels of a HDSPe and calculating the difference of the recorded waveform in volts/second at 96000 sampling rate I get the following results:

http://dl.dropbox.com/u/56438601/double … erence.PNG

Following is the same test but at 192000 sampling rate:

http://dl.dropbox.com/u/56438601/quad_s … erence.PNG

I would not have expected so much more noise at 192000.
Can anyone explain this?

Best regards,
Russell

  • From: Germany
  • Registered: 2007-04-10
  • Posts: 9,690

Re: quad speed noise with HDSPe AIO

The manual explains the noise levels at higher sample rates - in short, it's noise shaping...

Regards
Daniel Fuchs
RME

Regards
Daniel Fuchs
RME

RME Support's Website

  • Registered: 2012-05-01
  • Posts: 11

Re: quad speed noise with HDSPe AIO

Any chance I can turn off noise shaping?
I'll using this card for audio analysis tests and I want the noise passed through as is.

Regards,
Russell

  • From: Germany
  • Registered: 2007-04-10
  • Posts: 9,690

Re: quad speed noise with HDSPe AIO

No, sorry, this is something the converter chips do.


Regards
Daniel Fuchs
RME

Regards
Daniel Fuchs
RME

RME Support's Website

5 Reply by MC

  • MC
  • MC
  • Administrator
  • Offline
  • From: Germany/Thailand
  • Registered: 2007-04-06
  • Posts: 25,431

Re: quad speed noise with HDSPe AIO

...nearly all converter chips do. Some more, some less. You will  have to live with that...

Regards
Matthias Carstens
RME

MC's Website