Topic: latency | Allen & Heath Digital Community

latency

This topic contains 15 replies, has 8 voices, and was last updated by Dave 12 years, 1 month ago.

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2012/02/21 at 6:33 pm #22939

dshriver
Participant

What is the total latency of the iLive. How long does it take to go from input socket>AD conversion >dynamic processing>inserts (fx, etc)>DA conversion >output socket

Is this a fixed latency or does it vary based on what dynamics are engaged? Does routing an IP via a group increase latency? Does adding an insert FX increase latency?

Thanks!

-d

2012/02/22 at 4:58 am #29594

gilparente
Participant

Uhm!! Interesting. I never really cared, but ill take some measurements soon.

Gil Parente
Design & Integration
Entertainment Arts, Inc.
iLive 176, T112
iDR48 , iDR16, iDR10
Multiple iPads
Dante
Etc..

2012/02/22 at 7:53 am #29595

inlinemedia
Participant

hi!

i have done various time-measurements on my ilive
if someone wants that – please contact me!

greetz,
andee

—
andreas putz
foh engineer
office@inlinemedia.at

2012/02/22 at 3:54 pm #29601

grahamwhite
Participant

Search and ye shall find….

[]

[url][https://iliveforum.allen-heath.com/topic.asp?TOPIC_ID=1130&SearchTerms=Latency/url]

http://www.TotalLiveSound.com

2012/02/22 at 6:04 pm #29673

inlinemedia
Participant

@ graham: nice – but there are differences in latency if you use an aux, group, matrix, …

that’s why i made these measurements

greetz,
andee

—
andreas putz
foh engineer
office@inlinemedia.at

2012/02/23 at 1:55 am #29676

grahamwhite
Participant

Put all the measurements online then, Why keep them to yourself? Or are you the latency police?

http://www.TotalLiveSound.com

2012/02/23 at 7:44 am #29678

inlinemedia
Participant

… why should i keep it by myself?? i wrote that anybody can have this sheet …

here it is – especially for you, graham

https://www.andreas-putz.com/tech_files.html

greetz,
andee

—
andreas putz
foh engineer
office@inlinemedia.at

2012/02/24 at 10:42 am #29685

woutert
Participant

I wouldn’t use white noise for latency measurements.

Since this is quite randomly generated noise, it’s harder for the software to find the exact latency, moreover because you’re not constantly in the digital domain. I would use a less random source like music.

To me, the 1,3ms is significant and maybe the 0.5ms difference between “mixrack local” and “mixrack to surface”. The 0.1ms differences between using a group or matrix, to me, are less significant.

One could argue that it’s a pity that there isn’t a latency correction in the board, just like DAW software does. Does anyone know if other brands implement this?

Wouter
IDR32, R72, Dante, Mixpad
laptop, TP-Link TL-WR1043ND

2012/02/24 at 1:33 pm #29686

Dave
Participant

Latency correction just adds more latency. Hopefully such a feature would be switchable for those that don’t find a need.

iDr48/T-112/MADI

2012/02/24 at 3:00 pm #29687

inlinemedia
Participant

hi all!

… white noise is the best stimulus you can use for such measurements
why? because you have equal power within a fixed bandwidth – music will be more randomly, of course!

and no – the software does not correct the internal latency – so it is like it is!

greetz,
andreas

—
andreas putz
foh engineer
office@inlinemedia.at

2012/02/24 at 11:35 pm #29688

SteffenR
Participant

quote:

Originally posted by inlinemedia

hi all!

… white noise is the best stimulus you can use for such measurements

Seriously, it’s better to use a MLS or short pulses. MLS sounds like white noise but it has no random components. Short pulses contain the whole spectrum, also very good for measuring.
But to be fair, the results would not be that different, I guess.

SRV-AVB
R-72, iDR-16, xDR-16, Dante

2012/02/24 at 11:47 pm #29689

SteffenR
Participant

quote:

Originally posted by woutert

I wouldn’t use white noise for latency measurements.

Since this is quite randomly generated noise, it’s harder for the software to find the exact latency, moreover because you’re not constantly in the digital domain. I would use a less random source like music.

To find sync points is possible…music is not really better…

SRV-AVB
R-72, iDR-16, xDR-16, Dante

2012/02/24 at 11:51 pm #29690

SteffenR
Participant

some explanations from the developers…

https://iliveforum.allen-heath.com/topic.asp?TOPIC_ID=1840

SRV-AVB
R-72, iDR-16, xDR-16, Dante

2012/02/25 at 2:08 am #29691

CMattE
Participant

There is no way to have no latency in a digital system. I am a bit surprised not everything has the same latency. I don’t yet use any fancy routing so I’m okay, but would like a “delay compensation” option to keep things phase accurate.

T112/48, MacBook Pro, D-link DIR-815, iPad 1 w/mixpad, Dante card feeding a Mac Mini w/DVS.

2012/02/25 at 6:43 am #29692

SteffenR
Participant

A delay compensation would keep phase coherency but will introduce more latency.

SRV-AVB
R-72, iDR-16, xDR-16, Dante
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