On Fri, Oct 14, 2022 at 04:01:45PM -0400, Geoff Steckel wrote: > > > > I did simple A/B tests with music from CDs and my ears couldn't hear > > the aliasing noise. Try it. > Good a/b >x< tests for audio require extreme care to get accurate results. > Simple sine sweeps don't show IM distortion well. > In most cases numerically equal amounts of IM distortion are far more easily > noticed than harmonic distortions or simple noise (white, pink, etc.)
Sure, there is measurable aliasing. My questioning is: is it audible in 99% of the cases? Remains the question, how to handle the 1% remaining. For now, resampling off-line is the least annoying, IMHO. > > Sometimes you just don't want to think about it (ex., when you debug > > audio stuff), so resampling off-line (or switching the device rate) > > still makes sense in certain cases. > This is the classic "why would you ever want to do that?" > "Just as good" is an opinion. > Other OSs can and do provide controls which allow setting the device > sample rate to whatever the device can do. > This user wants that to work. > > This means compiling a kernel with AUDIO_DEBUG Real Soon Now > and inserting a few more DPRINTFs. AFAIK, sample rate changes in the kernel are OK, at least in uaudio driver. Now it's all in sndiod (or how to bypass sndiod to get bit-perfect audio)
