| Jitter on Firewire & USB protocols - Bob Katz replies [message #93924] |
Sun, 23 December 2007 17:26  |
Neil
Messages: 1645
Registered: April 2006
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Senior Member |
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In a recent thread here that had a question come up with regard
to jitter, I mentioned that Bob Katz pointed out in his book
that Firewire tended to be more prone to jitter. Since I've
been shopping around for a laptop - mainly for general office-
type use (documents, spreadsheets, etc), but would also like to
have the option of using it for audio should the need arise, I
thought I'd try e-mailing him with a question about UBS vs.
Firewire jitter... he responded pretty quickly, I must say, and
I thought I'd post his answer in case it might be helpful to
anyone else here, whether they're using such an interface for
laptop, or desktop use:
<begin paste of my question & his reply>
Hi Bob...
I am in the process of reading your Mastering Audio book, and I
noticed that you mention in there that Firewire tends to be
more jitter-prone. If I'm looking for a mobile solution (for
remote recording into a laptop), do you feel that the USB 2.0
protocol is better than Firewire? Worse? Not much different?
HI, NEIL. Thanks for writing.
What you need is an interface which provides a stable clock to
the converters and does not get its clock from the Firewire OR
the USB. Look to companies that specialize in high quality
conversion first and are aware of these issues. When in doubt,
quiz the company engineers (not just the sales people), don't
just take their advertising for granted.
I hope this helps,
Bob
<end paste>
I don't know of any offhand that specifically get their clock
from either internally or externally, as opposed to from the FW
or USB port itself, xcept for the RME Fireface 400 & 800, which
can be externally-clocked; but now we at least know what to
look for for best audio quality when using these types of
interfaces (interfascia?) :)
Neil
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