[time-nuts] Clocks for Audio gear

[Chris Albertson]

On Thu, May 10, 2012 at 12:57 AM, MailLists <lists at medesign.ro> wrote:
> Hearing tests showed the ability to discern jitter above a few hundred
> nanoseconds rms.
> http://amorgignitamorem.nl/Audio/Jitter/Detection%20threshold%20for%20distortions%20due%20to%20jitter%20on%20digital%20audio%2026_50.pdf
>
> Others claim the ability to detect jitter in the picoseconds range...

If we are to believe the above paper,then those guys who claim to hear
pS jitter are wrong.  Likely they can also here is a fuse is is place
in the holder "backwards".

So by the above, no now can hear 250 nS of jitter.    I really doubt
any decent system other then the most low-cost consumer level junk has
jitter at the 250 nS level.   Even a TTL "can oscillator" is better
than that.

A TTL can that is marked "4.096 MHz" costs about $2 and will make a
square wave with a period of very close to 250 nS.   Then they divide
this down to the sample rate of 96KHz.   In order to see a 250 nS
jitter in the 96K signal the TTL can would have to "skip a beat".
250 nS is is a huge error and you don't get there with digital noise

Chris Albertson
Redondo Beach, California