arnyk wrote: > The article could convince a naive reader that JS has measured an > improvement due to his device, but > > "What I have been finding in looking at DACs etc with USB inputs is that > there is what I am calling "packet noise". This is bursts of noise > caused by the USB receiver processing the packets of data. This noise > shows up on both power and ground planes. Since the rate of packets is > 8KHz there are strong components of this noise in the audio band. This > noise can cause jitter in clock oscillators, reclocking flops, and DAC > chips. It can also go directly into noise on the output of DAC chips." > > This is the same 8 KHz that noise that I posted Archimago's FFT of. Been > there, done that FFT many times. He calls it packet noise, I call it > framing noise, they are the same, no controversy. > > Unfortunately there are many other sources of framing noise in audio > systems, including optical disc players, any HDMI link, any network > connection, any SPDIF link, a digital music player operating off of any > kind of media, you name it. It can leak into analog outputs as a > coherent signal, and the processes that causes it can also cause jitter. > > What I still don't see is reliable evidence that something that happens > outside of a box so afflicted (e.g. USB links) can significantly change > these processes inside the box. Furthermore while the world of audio is > full of framing noise, it is also full of clever engineers who push it > way below audible thresholds so that the only people who seriously think > they can hear it are usually placebophiles doing unbelievably unreliable > listening tests.
Jeez, man, did you fail reading comprehension in school or are you just pretending to be so stupid? It has been pointed out to you over & over & it's quite clearly stated in the 4th paragraph that *"t-his packet noise consists of two parts: noise from the USB protocol engine and from the USB PHY." -*And from then on the rest of the article is about USB PHY noise & the Regen. How often do you try to confuse others just because you are confused? ------------------------------------------------------------------------ jkeny's Profile: http://forums.slimdevices.com/member.php?userid=35192 View this thread: http://forums.slimdevices.com/showthread.php?t=103684 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
