![]() So, yeah, I think it's helpful to understand the distinctions here. The USB receiver chip has it's own level of reconstructive logic to try and reassemble a clean pulse train before that pulse train is sent to the actual DSP / DAC. When one uses a USB cable to take data from one's computer and move it into the external DAC, the there is another level of data interpretation and reconstruction essentially taking place at either end of the USB cable analogous to the toslink scenario mentioned above. If one uses Toslink, the electrical pulse train is converted to an optical pulse train and back again by the toslink transceivers at either end of the optical cable, but it's still the same logical pulse train. There is no logical interpretation / reconstruction / processing of the waveform as such, in these instances. It is important to understand that the is technically no A/D or D/A conversion going on in these instances where the digital data is being transmitted / transported from one place to another. Is there anything in the Advanced edition that's not in the Trial version? Does the Advanced edition just activate the stuff that's on the Advanced tab of the Fidelia Preferences? It's a little balky (misses a beat now and then) running on my dual 1.8 GHz G5 running Leopard (they just put the Leopard compatible version back up). Other than that, Fidelia works great with my MacBook Pro/Snow Leopard. I don't get that when using the 10 band graphic eq in Fidelia or in iTunes either (with iTunes "preamp" turned down a bit to compensate for boosted freqs). In Fidelia with the Apple 31 band eq I got some distortion with bass boosted by only 3 db. I don't recall Pure Music allowing presets. I like that it will automatically change the sample rate to match the song and that it includes access to AU and VST plugins as well as allowing you to make EQ presets so I can nudge the sound a little bit different for each headphone (but no more than about 3 dB). I just hope that at some point someone, at least with a decent oscilloscope or other gear, can be encouraged to make some. ![]() We really need, and I really want to see some proper technical information on these things and some measurements as well. I think we tend to use jitter as a catch-all term for any imperfections in the physical transmission of the digital signal without really understanding what is going. As well, many of the factors affecting the transmission are not jitter related at all (from my limited understanding), but relate to many other factors depending on how the signal is being transmitted physically and, in this discussion, possibly how it it being handled by the software. The switch between 0 and 1 and back doesn't have an instant transition. You absolutely don't get a cleanly transmitted square wave in most gear from what I've seen. I don't think he meant that the signal is converted to an analogue one, what he means is, look at a digital signal as being akin to an analogue transmission of a square wave, which is what is going on in the underlying hardware. ![]() I really dont mean to be rude, thats not my intention at all, but there really is too much disinformation(unintentional most of the time) running around on this site, and ive found being as blunt as i can to be the best combatant of that. And that square wave is exactly what the DAC chip inside your dac see's as well, after all the processing at the reciever is done(splitting apart the separate channels and such) the square wave is sent to the dac. those 1's and 0's are stored as either a north or south magnetic poles in the hard drive and as square waves of some kind the whole way through your computer. There are never any hypothetical little number 1's and 0's running around. the square wave signal is digital, its a series of on and off pulses that represent 1's and 0's, there is no digital to analog conversion being done before it gets sent down the USB cable to the dac, it is of course being presented by an analog signal, because any waveform is going to be analog technically even though its modulation is digital.
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