[SlimDevices: Audiophiles] Re: PSU for SB?
Coffee;152415 Wrote: Which makes sense. The SPDIF signals represent each bit by 2 edge transitions. The original sampling frequency is known (44.1 kHz). Therefore, by buffering the incoming bits a good DAC can eliminate all the jitter introduced in the previous stages, regardless of the origin of the jitter. I can understand that a good power supply is important for the DAC itself, so that it doesn't generate its own jitter. But I don't see why the power supply to the digital sections need to be so perfect. I think this is true, so long as the DAC properly buffers the data (not as easy as you might think - remember, the two clocks will never run at the same speed, so the DAC clock must re-adjust its rate dynamically). The Lavry seems to do this the right way - they explain how in a white paper. That should make the DAC totally immune to input jitter. However I don't think this ia the case for most DACs. If you're worried about electrical connections, use Toslink. -- opaqueice opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=29360 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: PSU for SB?
Coffee;152395 Wrote: I noticed that many users are using a PSU with an SB3 and an external DAC. If the DAC is a good one (that resamples the input digital signal), why would a PSU to the SB3 make any difference? It's all digital. I've never heard of anyone adding a PSU to a computer to make it more 'accurate'! Read here: http://www.tnt-audio.com/clinica/jitter1_e.html -- P Floding P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=29360 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: PSU for SB?
P Floding;152401 Wrote: Read here: http://www.tnt-audio.com/clinica/jitter1_e.html According to the reference [10] quoted by the 'tnt' article: http://www.epanorama.net/documents/audio/spdif.html Small jitter D/A conversion is implemented by using separate PLL clocks for data recover and DAC and by using a buffering between data recovery and DAC. Which makes sense. The SPDIF signals represent each bit by 2 edge transitions. The original sampling frequency is known (44.1 kHz). Therefore, by buffering the incoming bits a good DAC can eliminate all the jitter introduced in the previous stages, regardless of the origin of the jitter. I can understand that a good power supply is important for the DAC itself, so that it doesn't generate its own jitter. But I don't see why the power supply to the digital sections need to be so perfect. -- Coffee Coffee's Profile: http://forums.slimdevices.com/member.php?userid=8198 View this thread: http://forums.slimdevices.com/showthread.php?t=29360 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: PSU for SB?
A good stable quiet supply reduces the jitter in digital circuits as well. Delay times and transition times of digital circuits are dependant on the supply voltage, so more tightly controlling the voltage can improve the amount of jitter. Do some web searching on over clocking the cpu in your PC, and you'll quickly see that tweeking the supply voltages are an integral part of the procedure. The clock and data are combined in the SPDIF signal, so any jitter in the clock on the digital sending side has the potential to influence the clock in the receiving DAC. Hope this make sense! Dave -- DCtoDaylight DCtoDaylight's Profile: http://forums.slimdevices.com/member.php?userid=7284 View this thread: http://forums.slimdevices.com/showthread.php?t=29360 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: PSU for SB?
DCtoDaylight;152418 Wrote: The clock and data are combined in the SPDIF signal, so any jitter in the clock on the digital sending side has the potential to influence the clock in the receiving DAC. Hope this make sense! Dave Well, if asynchronous resampling is used in the DAC, then the jitter per se in the SPDIF signal becomes less important. However, noise can be transmitted between components through the coaxial connection, so it is good to isolate the transport from the DAC, if possible, with a pulse transformer on the receiving end. -- ezkcdude DIY projects page: http://www.ezdiyaudio.com System: SB3-EZDAC-MIT Terminator 2 interconnects-Endler Audio 24-step Attenuators (RCA-direct)-Parasound Halo A23 125W/ch amplifier-Speltz anti-cables-DIY 2-ways + Dayton Titanic 10 subwoofer He's not hi-fi, he's my stereo. ezkcdude's Profile: http://forums.slimdevices.com/member.php?userid=2545 View this thread: http://forums.slimdevices.com/showthread.php?t=29360 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
