Emu XL-7 & MP-7 User's Group

In a message dated 11/6/02 9:00:34 AM, xl7@yahoogroups.com writes:


> > Anyone ever noticed when you first power up the xx-7 the digital out
> > makes crackling noises until the unit warms up. Everything's right on
> > my end as far as setting my interface to clock to digital inputs.
> > Strange, as the xx-7 warms up the noise seem to decrease??? Anyone?
> 
> The symptoms still suggest a lack of proper clock synchronization with the
> decrease over time due to the XX7's clock drifting into proper range.  Is
> there a way you can verify?  What type of digital input are you driving?
> 

That's typical when first powering up. You'll likely hear the clocking static 
for about 5 seconds or so until the clock locks. I work with a lot of 
differing sample rates from 44.1k to 96k and whenever I first power up a 
piece or switch the master clock's rate, it takes a few seconds for 
everything to sync up.

jt burke


[Non-text portions of this message have been removed]

On 11/6/02 2:27 PM, "punkpk@..." <punkpk@...> wrote:

>> The symptoms still suggest a lack of proper clock synchronization with the
>> decrease over time due to the XX7's clock drifting into proper range.  Is
>> there a way you can verify?  What type of digital input are you driving?
>> 
> 
> That's typical when first powering up. You'll likely hear the clocking static
> for about 5 seconds or so until the clock locks. I work with a lot of
> differing sample rates from 44.1k to 96k and whenever I first power up a
> piece or switch the master clock's rate, it takes a few seconds for
> everything to sync up.
> 
> jt burke

True, but not in this case.  The symptom was that the audio got better, not
right.  The presence of some degree of noise in the signal still pointed to
a synchronization problem.

I have, BTW seen sync problems cause aperiodic pops happening about once
every 10 seconds or so.  Otherwise everything sounded fine.


drk

www.delora.com/music
www.mp3.com/zdrk
drk.iuma.com

> I have, BTW seen sync problems cause aperiodic pops happening about
> once every 10 seconds or so.  Otherwise everything sounded fine.

That's usually caused by not synchronizing at all.  At that point
you're running on luck that the crystals in your two pieces of gear are
at the EXACT same frequency (never happens).  A pop every 10 seconds
means that the two clocks are off by one sample every ten seconds
(roughly equivalent to being 0.00023% different at 44.1khz).

-Aaron

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