Can we say the ATH curve is no flat line below 16kHz and so a shaped noise can be build?

The latest SSRC of Naoki Shibata strangely lists ATH based shapes for all kinds of samplerates but 32kHz.

I for myself find such discssions interesting and wonder where we should put the line between 'must abx' and 'best practise'. I never would critic SoX for using 32bit processing when we could get away with 24bit processing in abx tests.

I applaud Best Practices^TM, though I often have a hard time discerning it from voodoo.  This goes for all the masturbation over samplerate conversion as well, which, in light of other recent discussions on the subject, is likely why I continued on with this rant.

Maybe jjf5 should start a poll if members use shaped dither or not

Quote from: Wombat on 2016-11-26 17:41:39

SoX for example works at 32bit integer internaly and creates new data from 16bit input. It dithers the output when the output will be 16bit. This is afaik common practise.

I think its common practice because its more work for the programmer to identify the cases where the second layer of dithering is not needed and can be skipped. 

This is a subtlty that many many not be familiar with. 

Double dithering may slightly increase background, but usually not audibly.   Some of the early (ca. 1970s and 80s) AES and SMPTE papers about dither were  concerned about the noise that may be  added by  dithering and include it in their analyses. It generally turns out to be a nit.