More > JRiver Media Center 22 for Windows

SoX, upsampling filters, MQA, etc.

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Matias:
I just want to be able to tweak the upsampling parameters to be able to test and use a setting that is better for me.

For example look at Stereophile's review of the Ayre QX-5 converter.
https://www.stereophile.com/content/ayre-acoustics-qx-5-twenty-da-processor-measurements

For ages now the late Charles Hansen had implemented a hardware switch to toggle between 2 modes of minimal phase filter.

* "Measure" has more post ringing on the impulse response but has lower artifacts on the 19kHz full scale sine test on the frequency response. Uses the typical brickwall steep filter.



* "Music" (also called "Listen" on previous DACs such as QB-9 and players such as C5) has more artificats on the 19kHz sine on frequency response but less post ringing on the impulse response. They call it "Music" and "Listen" because they believe the trade off is worth for a more musical experience.


Compare this with the typical linear phase filter that for example Benchmark DAC3 HCG uses. Ringing before and after the impulse in exchange for lower artifacts of the 19 kHz sine wave.
https://www.stereophile.com/content/benchmark-dac3-hgc-da-preamplifier-headphone-amplifier-measurements




As we can see this is important for music playback. Upsampling is not only "filling the high frequencies with empty information" as some people think. The parameter setting is important enough for Ayre and many other manufacturers to implement this their hardware.

PLEASE give the users the option to choose this in JRiver software upsampling.
If not the full parameter set at least a check box for choosing "minimal phase slow roll off filter" on both local and DLNA playback.

SoX on Ressampler V below.


Ayre's PDF: https://www.ayre.com/white_papers/Ayre_MP_White_Paper.pdf

Thanks!  :)

FelipeRolim:
+1 for SoX parameters

Awesome Donkey:
If you do a search of the forums (and this topic), it's been said by the devs they don't plan on integrating full SoX or giving configuration options. But you can always create a new topic (in the Media Center 23 section) requesting a full SoX implementation and giving your reason(s) why you want it. It's worth a try, I suppose. Personally, I wouldn't mind seeing at least de-emphasis being added but it's no dealbreaker for me (since I maintain de-emphasised files in my music library alongside the originals).

As said before, they don't use the command line tool, just the resampling library. That's it.

Matias:
Maybe using another SRC codec then? The point is implementing the parameters in JRiver somehow to allow tweaking the filter to one's liking.
For example the competition has Izotope's SRC implemented. Maybe licensing from them too if SoX is unavailable?
And again my question remains: how does Ressample V implement SoX parameters for free?

mourip:

--- Quote from: FelipeRolim on December 13, 2017, 06:01:34 am ---+1 for SoX parameters

--- End quote ---

+1 for SoX parameters. I have found SOX to be a valuable addition and the ability to tweak would be great,

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