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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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