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"Bit-perfect" DSD output with gain in Korg AudioGate
tahaa7
post Nov 21 2011, 22:36
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Hi everyone,

Just a quick question: if I set a gain (negative), say -3dB in Korg AudioGate while playing a .dff file, will the output still be "bit-perfect" (or of the same quality, if you will) or will AudioGate degrade the signal quality because of the gain?

The reason I'm asking this is because with the gain set to 0, I get clipping at the output. At first, I assumed this was due to bad mastering and compression, but apparently with the DSD-to-PCM conversion, this may not be the only reason, due to the sheer nature of the DSD recording.

Thanks.

P.S.: I'm using an ASIO driver. AudioGate is set to PCM sampling rate of 192kHz.

This post has been edited by tahaa7: Nov 21 2011, 22:42
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Wombat
post Nov 21 2011, 23:49
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QUOTE (DVDdoug @ Nov 22 2011, 00:31) *
I'm not DSD expert, but I don't think bit perfect DSD to PCM is possible. (I think if you convert from DSD to PCM and then back to DSD, the new DSD data will be different.)

We have a nice thread here http://www.hydrogenaudio.org/forums/index....=37717&st=0
It isnīt possible to translate DSD losslessly to PCM. The nearest approach will be to transalte digital values present in DSD to values in PCM with some kind of Matrix. The higher the PCM resolution the more precise.
24bit/352.8kHz seems the value that can perfectly represent all DSD noise smile.gif
You can create PCM version from there on to anything that is usable to you. You should handle this like downsampling any other PCM material.
24bit/88.2kHz with an early lowpass should preserve anything recorded in the DSD data. More bandwith only translates to more useless noise imho. So Korg already has the wrong approach, it allows lots of aliasing with preserving tons of noise and only using very gentle filters.

Edit: in the userguide to Audiogate they claim 1-bit audio may exceed the limits of PCM so you should apply -3dB on converting. Strange, i understood it differently. Maybe someone more experienced can help. Also i rechecked and they use a "Sharp" lowpass with -3db at 42kHz. Another strange value that makes no sense for me besides looking good on a spectral view.

This post has been edited by Wombat: Nov 22 2011, 00:22
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