sox/mansr: DSD to PCM

sox/mansr: DSD to PCM

[tsepp2000]

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Re: sox/mansr: DSD to PCM

[Måns Rullgård]

tsepp2000@web.de writes:

> Hello,
>
> does anyone have any experience with which Sox-Mansr parameters to get the
> best possible conversion (noise...) into a PCM file? I found this one,
> which uses Sox "filters". What does that mean?

To convert DSD to PCM, use the 'rate' effect just as you would to
convert between PCM sample rates.

-- 
Måns Rullgård


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Re: sox/mansr: DSD to PCM

[tsepp2000]

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Re: sox/mansr: DSD to PCM

[Måns Rullgård]

tsepp2000@web.de writes:

> Thank you Mans,
>
> my question was a little more profound. I have linked 3 pictures that show
> the difference between three of many ways. Some filters are also used
> here. My question was about whether someone here has deeper experiences
> and has also made listening comparisons about the highest quality command
> for sox.

The thread you linked is about conversion from PCM to DSD.

> I could not attach my 3 example pictures (Spek): Every file 32 Bit Float,
> Sox-files linear phase. Here the download-link:
> https://www.file-upload.net/download-14089057/DSF2WAV.zip.html
> The Spek-pictures:
> - Xrecode3.png output 352,8kHz File (Standard-output of XRecode3)
>
> - Sox_rate_savL88200_gain_8_lowpass_1_25000_sinc_30000_n43.png
> sox input.dsf -b 32 -e float output.wav rate -s -a -v -L 88200 gain 8
> lowpass -1 25000 sinc -30000 -n 43

That uses the rate effect, then applies some additional low-pass
filtering, presumably to remove the modulator noise.

> - Sox_rate_savL88200.png
> sox input.dsf -b 32 -e float output.wav rate -b 99 -a -v -L 88200

And that's just the rate effect without any additional filtering.

I don't quite understand what you're asking.

-- 
Måns Rullgård


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Re: sox/mansr: DSD to PCM

[tsepp2000]

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Re: sox/mansr: DSD to PCM

[Måns Rullgård]

tsepp2000@web.de writes:

> My question: Because we use this conversion to convert music files, which
> are basically of the very best quality, in a way that goes very far
> (conversion with influence of noise, time, gain and more ...), a
> discussion with a 360 degree view of all phenomena would be very helpful,
> how this can best be done with Sox to get an adequate (here) PCM file. The
> standard procedure with Xrecode3, for example, is not optimal.

The 'rate' effect with no special options should give good results.
Conversion of DSD64 to a rate higher than 48 kHz will end up with some
ultrasonic noise.  If you don't like this, you can reduce it with an
additional low-pass filter.  That's all there is to it.

-- 
Måns Rullgård


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Re: sox/mansr: DSD to PCM

[tsepp2000]

Thank you Mans for your efforts. My mistake. I'm in the totally wrong forum.

Regards
Thomas


> Gesendet: Donnerstag, 21. Mai 2020 um 16:12 Uhr
> Von: "Måns Rullgård" <mans@mansr.com>
> An: tsepp2000@web.de
> Cc: sox-users@lists.sourceforge.net
> Betreff: Re: sox/mansr: DSD to PCM
>
> tsepp2000@web.de writes:
> 
> > My question: Because we use this conversion to convert music files, which
> > are basically of the very best quality, in a way that goes very far
> > (conversion with influence of noise, time, gain and more ...), a
> > discussion with a 360 degree view of all phenomena would be very helpful,
> > how this can best be done with Sox to get an adequate (here) PCM file. The
> > standard procedure with Xrecode3, for example, is not optimal.
> 
> The 'rate' effect with no special options should give good results.
> Conversion of DSD64 to a rate higher than 48 kHz will end up with some
> ultrasonic noise.  If you don't like this, you can reduce it with an
> additional low-pass filter.  That's all there is to it.
> 
> -- 
> Måns Rullgård
>


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