Re: [SlimDevices: Audiophiles] Triode plugin with M-DAC
JohnSwenson wrote: > These chips DO add a significant amount of jitter to the USB signals > themselves, whether this jitter winds up as jitter on the clock feeding > the DAC chips (the only place where jitter really matters) is going to > be VERY implementation dependant. In some DACs it won't get through to > the clock, in others it will. How does jitter get through an asynchronous interface? Isn't that a bit like talking about jitter on an Ethernet connection? JJZolx's Profile: http://forums.slimdevices.com/member.php?userid=10 View this thread: http://forums.slimdevices.com/showthread.php?t=94822 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Triode plugin with M-DAC
The USB isolators block a potential path for a ground loop through the ground of the USB connector of the "computer" (Touch in this case). Whether this is necessary will of course depend on the computer and DAC and how the power supplies are hooked up. There has been so little use of USB DACs with the Touch that all the reports I know of are using the isolators with regular computers, so may or may not have relevance for the Touch. The isolators themselves that I am aware of put the isolator in front of the USB receiver in the DAC, they all use the same chip. These chips DO add a significant amount of jitter to the USB signals themselves, whether this jitter winds up as jitter on the clock feeding the DAC chips (the only place where jitter really matters) is going to be VERY implementation dependant. In some DACs it won't get through to the clock, in others it will. So in some situations it comes down to a tradeoff between higher jitter and lower ground loop noise, or it may not do anything at all. Or it may make things worse! My personal favorite approach is to have a USB reciver running off the VBUS with the logic level outputs going through isolators (I prefer GMRs) to the rest of the DAC. This way everything having to do with the USB stays on the computer domain. John S. JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=94822 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Triode plugin with M-DAC
I found optical to a DAC (Cambridge Audio DACMagic) from my Touch (and then into an Arcam A85/Dynaudio Excite X12) to be better than coax. For a £4 spend it was well worth the experiment! gw43's Profile: http://forums.slimdevices.com/member.php?userid=11327 View this thread: http://forums.slimdevices.com/showthread.php?t=94822 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Display Off screensaver
Triode wrote: > Yes, and probably set the timeout to 10 seconds. After the 10 seconds > timeout, this will cause the screen to blank by turning off the > backlight and disabling the display in the same was as TT3 and also > stopping the render of the screen which happens within the squeezeplay > application. The later means than if the display would have shown > scrolling text then it will not be updated taking cpu time even though > you can't see it. Got it...thanks. It seems to work just fine. I do prefer the flexibility of being able to access the Touch's screen (though I mainly use iPeng) without needing to give up the potential noise benefit of having the screen off. This app does away with the slight inconvenience of having to ssh into tt 3.0 in order to turn the screen back on/off when I need to get at the Touch's menus. rgro's Profile: http://forums.slimdevices.com/member.php?userid=34348 View this thread: http://forums.slimdevices.com/showthread.php?t=95084 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Display Off screensaver
rgro wrote: > Hi Triode, > > Just to clarify, am I correct in that for your app to function when > music is playing, the "Display Off" option should be selected under > "Screensavers>When Playing"? > > Thanks, Yes, and probably set the timeout to 10 seconds. After the 10 seconds timeout, this will cause the screen to blank by turning off the backlight and disabling the display in the same was as TT3 and also stopping the render of the screen which happens within the squeezeplay application. The later means than if the display would have shown scrolling text then it will not be updated taking cpu time even though you can't see it. Triode's Profile: http://forums.slimdevices.com/member.php?userid=17 View this thread: http://forums.slimdevices.com/showthread.php?t=95084 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Display Off screensaver
Triode wrote: > I will post this here as its clearly unproven and something to discuss > on the audiophile board > > I've just posted a new app to the repro for Squeezebox Touch - this > provides an alternative to the built in Screen Off screensaver which > disables some of the processing associated with the screen when the > screen is off. It does the same as TT screen off + also disables some > internals to the squeezeplay application related to rendering the screen > when it is off (reducing cpu load for scrolling text etc when the screen > is off). > > The intention is you may want to try it as a "when playing" screensaver > which will bank the screen after the delay and hence use less cpu power. > Whether this has an impact on the audio quality is unproven and the > reason I am posting here... > > To install: On the player goto 3rd Party Apps, unselect "recommended > Apps only" and then select "Display Off" > > [As an aside - I note that with the EDO app installed and the internal > digital out selected so that the analog output is not enabled, if you > measure the analog outputs on an oscillocope then you see a much lower > noise floor than when the analog dac is enabled. At the limit of my > simple scope's gain I can see noise which is related to cpu activity - I > believe looking at this, that disabling the screen does have a > measurable impact, but it is very much at the limit of what I can see > and well below the normal noise floor of the analog output. Whether > this impacts what you can hear is a completely different matter] Hi Triode, Just to clarify, am I correct in that for your app to function when music is playing, the "Display Off" option should be selected under "Screensavers>When Playing"? Thanks, rgro's Profile: http://forums.slimdevices.com/member.php?userid=34348 View this thread: http://forums.slimdevices.com/showthread.php?t=95084 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter visualizer question
russelk wrote: > Is it possible to have a different visualizer on each display? I'd like > to have VU meters on one and a spectrum analyser on the other at the > same time but I haven't been able to do this. I've only been able to > select a visualizer for the right-side display, the left always defaults > to "Now Playing". I apologise if this has already been asked before. The music information screen lets you specify left and right LEDs. I use is to display bit rate on mine. http://wiki.slimdevices.com/index.php/Information_Screen_plugin Jim jimbabwe's Profile: http://forums.slimdevices.com/member.php?userid=56198 View this thread: http://forums.slimdevices.com/showthread.php?t=95113 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
