Originally Posted by MLTKSHHBT
Hi Yuri, does your iso extractor apply noise cancelling when extracting iso to dsf? I can hear the background noise of dsf extracted by isoxdsf, though its very mild, but with earphones it's clearly there!
Noise is integral part of DSD.
When we playback DSD, noise level depend on both DSD modulator and demodulator.
Modulator may be used in conversion software (if extracted DSD is processed). DSD demodulator may be used in playback software or DAC.
Processing that may be applied in AuI (for non-bit-perfect mode): resampling/filtering, clickless, gain, normalizing level.
If ISO to DSF is converted (via AuI ConverteR) in optimized mode (with audio processing - not bit perfect), AuI filter high frequencies above 20 kHz. But DSD’s own noise is present anyway.
With some DSD demodulators it can give noise decreasing. These demodulators must have lower cutting frequency. For this case noise level will lower.
For other demodulators that have higher cutting frequency - DSD’s own noise passed by to output. And output signal may have higher noise.
In ideal apparatus ultrasound noise is inaudible. It «kill» some part of dynamic range of audible signal only.
But in real apparatus due non-linear distortions this non-filtered ultrasound noise shifted to audible range. I suppose, that you hear this shifted ultrasound noise.
Same things are happen with DXD records, that have significant non-filtered ultrasound noise derived from DSD.
Reasons of non-linear distortions may be in software or/and hardware.
Extracting DSF from ISO in AuI’s optimized mode may improve signal/noise ratio. But not for all playback hardware and software.
Information about optimized mode (there about PCM, for DSD also used 20 kHz filtering) in optimized mode http://samplerateconverter.com/content/what-optimization-audio-dac
Originally Posted by MLTKSHHBT
And also the sound quality of the output dsf files, are there any difference with free extractors?
As audio quality I consider as minimal distortions of original stuff after conversion.
I can’t disclose our internal research results about our competitors (including free) by ethical reasons.
For bit-perfect extraction may be lost last audio data blocks of extracted stuff (audible as clicks on borders of the songs) during extraction.
Different converters (non-bit-perfect extraction) may have different:
- level of noise/artifacts,
- clicks in converted files,
- stability DSD modulator issues (overload can cause break of work of DSD modulator),
Different issues may be fixed/improved in latest versions of a software. I.e. need compare certain versions of a extraction software.
AuI ConverteR’s demo specially have non-limited audio quality. It allow immediately test the converter without asking us even.
I can recommend RMAA, as analyzing software with automated measurement mode, as example.
From our side, we provide studio level quality of conversion (by measurable features) that expected for top level conversion software class from our point of view.
During development we always consider possibility of AuI for using in world the best music production projects.
I ask don’t consider the state as promo. It is our position in development only.