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#2553333 - 07/01/16 12:40 AM Latency measurements, FWIW  
Joined: Dec 2012
Posts: 3,888
Charles Cohen Offline
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Charles Cohen  Offline
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Richmond, BC, Canada
Focusrite (the makers of the Scarlett series of audio interfaces) have published some "round-trip" latency numbers. As one would expect, the new "Scarlett 2i2 2nd Generation" interface beats its competition:

. . . but all the numbers are quite low!

At least, they're low on a MacBook Pro -- there are no numbers for Windows machines.



. Charles
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#2553337 - 07/01/16 01:22 AM Re: Latency measurements, FWIW [Re: Charles Cohen]  
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ElmerJFudd Offline
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ElmerJFudd  Offline
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I'm actually eager to see key to see how low the newer USB3 or Thunderbolt interfaces can potentially get latency.

It's difficult to test this. Typically I imagine what you'd do is setup a Microphone and the analog outs of the PC/MacBook to record. Then you press the MIDI keyboard's key with a pencil to capture the click of the pencil on the key, then you compare how late the piano sound appears after key click.

The AD conversion of the interface should not be a factor in this case since both the pencil click and the software piano tone are recording through the same interface. Which means you should get a pretty decent idea from the number of samples or miliseconds after the key click you hear the attack of the virtual piano instrument. Obviously you can reduce the latency, but you have to lower the buffer. And the question becomes, how low can I go before I get snaps crackles and pops?

#2553341 - 07/01/16 02:38 AM Re: Latency measurements, FWIW [Re: Charles Cohen]  
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wouter79 Offline
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wouter79  Offline
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It's not difficult to test. No mics are involved, this is about the latency from the computer to the device to its output and then back through its input into the computer. Computers are very good at measuring this kind of latency (microseconds),


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#2553344 - 07/01/16 03:30 AM Re: Latency measurements, FWIW [Re: Charles Cohen]  
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MacMacMac Offline
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MacMacMac  Offline
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I went looking for that information from Focusrite ...
Originally Posted by Charles Cohen
Focusrite ... have published some "round-trip" latency numbers.
I've not yet found it, but I did find this on Focusrite's page:
Quote
Blinking your eye takes between 300 and 400 milliseconds in total, on average.
I questioned that figure. (It's really less. FAR less.) So I web-searched, and I found the 300-400 msec figure quoted EVERYWHERE.

I long ago read that it's closer to 20 msec. I don't know the correct figure. But just try blinking your eyes over and over. It's easy to reach 8x per second. So the widely quoted 300-400 msec is bull.

All of which shows that it's not just information that spreads rapidly online. Misinformation travels just as widely.

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#2553365 - 07/01/16 07:23 AM Re: Latency measurements, FWIW [Re: MacMacMac]  
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dire tonic Offline
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dire tonic  Offline
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uk south
Originally Posted by MacMacMac
But just try blinking your eyes over and over. It's easy to reach 8x per second.

- fluttering - avoid doing it in public while staring at someone - it could be misinterpreted.

Quote

So the widely quoted 300-400 msec is bull.

I've seen it though - it's a condescending blink.

#2553377 - 07/01/16 08:41 AM Re: Latency measurements, FWIW [Re: Charles Cohen]  
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joflah Offline
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I found this pdf that reported blinking measurements with a 600 frame per second camera (1.66 ms resolution). There's a good pair of graphs on page 5. It seems to support figures of 300 to 400 ms for the complete closing and re-opening of the eyelid in a blink. While you can blink faster, that's like comparing a trill to regular playing speed.
http://tinyurl.com/jxsplpt


Jack

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