Re: ultra low latency AD interface for visualization purposes
Re: ultra low latency AD interface for visualization purposes
- Subject: Re: ultra low latency AD interface for visualization purposes
- From: Ian Kemmish <email@hidden>
- Date: Mon, 6 Apr 2009 20:29:08 +0100
On 6 Apr 2009, at 12:59, cHeinrich Fink <email@hidden> wrote:
I am currently doing research in the field of realtime audio feature
extraction for visualization purposes. Basically I am building an
AudioGraph and using AudioUnits to analyze the stream and feed a
graphics layer (similar to the SonogramDemo). Of course you would want
the lowest latency possible during the whole process.
Don't forget that the "latency" of the screen is no better than 1/60
second, and that of your users visual systems is slightly worse than
twice that in most circumstances. (The Academy of Motion Picture Arts
and Sciences didn't standardise on 24 frames per second just at random!)
That places a fairly high lower limit on the latency that it's worth
aiming for on the audio inputs. And of course it's the same limit
that anyone faces when they're designing a mixing app with real-time
level meters displayed on the Mac's screen. So it seems to me that
any input hardware designed for any software mixing app will meet the
only real latency constraint that you face.
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Ian Kemmish 18 Durham Close, Biggleswade, Beds
SG18 8HZ
email@hidden Tel: +44 1767 601361 Mob: +44 7952
854387
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