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RCapes
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Joined: 22/06/04
Posts: 114
Loc: West Sussex
Why have separate, special clocks new
      #912200 - 03/05/11 04:58 PM
Dear Forum,

When all soundcards have clocks in them, what is the purpose of these very expensive, separate clocks?

Thanks for any answers


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desmond



Joined: 10/01/06
Posts: 8619
Re: Why have separate, special clocks new [Re: RCapes]
      #912203 - 03/05/11 05:05 PM
If you have three watches that are all good but all tell different times, which you you use to get the accurate time from?

The purpose of having one good clock is to a) have a *good* clock, and b) so you can clock *everything* else from it, locking it all to the one good clock.


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Hugh RobjohnsAdministrator
SOS Technical Editor


Joined: 25/07/03
Posts: 20806
Loc: Worcestershire
Re: Why have separate, special clocks [Re: RCapes]
      #912207 - 03/05/11 05:28 PM
Quote RCapes:

When all soundcards have clocks in them, what is the purpose of these very expensive, separate clocks?




The clocks in sound cards can't always be synchronised to some types of external reference, such as video sync, which is often necessary in audio-visual applications for example.

Also, it is sometimes more practical to use a master clock to drive everything from a central point, rather than chain the clock from a soundcard around a complex system.

For most small digital systems the clock in the soundcard is entirely adequate and can be distributed to the few units that need it without much problem.

And from a techniacl point of view, it is always better to run the main A-D from its internal clock. With only one or two exceptions, running an A-D from an external clock degrades its technical performance, sometimes quite significantly.

Hugh

--------------------
Technical Editor, Sound On Sound


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. . . Delete This
Here be Dragons


Joined: 23/06/08
Posts: 3888
Re: Why have separate, special clocks new [Re: desmond]
      #912208 - 03/05/11 05:29 PM
separate clocks are only really useful in complex digital systems where multiple devices need to be synchronised together... for example, if you have a protools rig, and logic rig, and a hardware recorder, and some digital FX, and a couple of digital 2 track recorders (like we do) then you need to get everything sync'ed together from one master clock, and doing so in parallel form a clock with multiple dedicated outputs is far more reliably stable than daisy chaining them all .

especially if some of the clocks use different formats, like Protools does, a master clock capable of generating all the different formats is essential.


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RCapes
member


Joined: 22/06/04
Posts: 114
Loc: West Sussex
Re: Why have separate, special clocks new [Re: RCapes]
      #912392 - 04/05/11 04:18 PM
Many thanks to those who answered. I now understand!

cheers


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Mixedup
active member


Joined: 03/09/03
Posts: 4636
Loc: Cambridge, UK
Re: Why have separate, special clocks new [Re: RCapes]
      #912611 - 05/05/11 08:33 PM
Hugh seems too modest to mention his authoritative article on this issue... so I'll post the link here for him


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