As far back as 2013, JS said he was measuring noise on '_AudioAsylum_' (http://www.audioasylum.com/forums/pcaudio/messages/12/126193.html) I'm sure SBGK will like this as it relates to the measured difference in noise JS has measured between the outputs from different bit-perfect software players > Hi JE, > the issue is not about day to day consistancy, but about "how can > different programms that all send the same bits to the DAC sound > different?" Is this what you are really after? > > The insight is to note that in my previous post I was talking about > things that affect the sound that are NOT changes to the bits, but > things like ground plane noise. I was trying to show that what is > happening inside the computer (processor, memory acceses etc) can change > the ground plane noise. Not just the amplitude but also the spectrum of > the noise. I'll give some specific examples later. > > Not all programs that read files and send bits to a DAC do it exactly > the same way. Some may have several buffers the data goes throuigh on > it's path, some may only have one or two. Some may be built using a > "layered" hierachical approach with different software "modules" that > call each other, where others may be fairly "flat" with just one routine > that does all the processing. > > The exact sequence of instructions and memory accesses is guaranteed to > be different between the programs. Since it is these instructions and > memory accesses that cause the ground plane noise, I hope you can see > that differences in how a task is done can produce different noise. > > And BTW this CAN be measured. I've built a little ground noise analyzer > that can easily see the difference in the noise from different programs > doing supposedly the same thing.
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