From: JosephKK on 6 Jun 2010 16:59 On Sat, 29 May 2010 15:32:01 +1000, Sylvia Else <sylvia(a)not.at.this.address> wrote: >On 29/05/2010 3:29 PM, David Eather wrote: >> On 29/05/2010 3:23 PM, Sylvia Else wrote: >>> On 29/05/2010 2:35 PM, John Larkin wrote: >>>> On Fri, 28 May 2010 21:10:32 -0700 (PDT), Glenn Gundlach >>>> <stratus46(a)yahoo.com> wrote: >>>> >>>>> There is a guy on DIY audio stating that jitter in SPDIF digital audio >>>>> causes distortions. OK. He also claims to have jitter in the 100 fs >>>>> area. Is he blowing smoke about the jitter or can he really achieve >>>>> sub pico second jitter? It seems to me that jitter in that system is >>>>> similar to Time Base errors in video systems. In analog video 1-2 nS >>>>> was achieved in both analog and digital Time Base Correction (TBC) >>>>> systems but I'm having problems getting my head around 100 fS and - is >>>>> it REALLY audible? >>>>> >>>>> Thanks to all for any insight. >>>>> >>>>> G² >>>> >>>> 100 fs RMS cycle-cycle jitter is possible from a very good, pretty >>>> expensive crystal oscillator. Of course it's not audible. >>>> >>>> Any signal processing, including quantization, causes distortion. So >>>> do microphones, speakers, and ears. People who worry about >>>> femtoseconds are lunatics. >>>> >>>> Sound doesn't travel very far in 100 fs. The performer's guitar, the >>>> recording microphone, the speaker, the walls of your listening room, >>>> your eardrums... all are moving around constantly much, much more than >>>> the distance sound travels in 100 fs. One *microinch* of vibration of >>>> any of them corresponds to 30 ns of jitter. >>>> >>>> Audio is mostly nonsense. >>> >>> He probably needs some gold wires leading to his crystal holder. I have >>> some in stock - only $100 per inch - extra fine for hi-fidelity >>> performance. >>> >>> Sylvia. >>> >> Extra Fine? Seems like that would be a very nice high profit item - more >> power to your cash register! > >Of course. Though sadly I have the same problem that others have >mentioned in this group; relieving fools of their cash is all very well, >but I need to be able to look myself in the mirror :( > >Sylvia. Slowly but surely i am becoming convinced that it is my civic and moral duty to remove cash from such pinheads before they do something really dangerous with it, like give it to a political campaign.
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