Soundcraft SI Expression - Delay - Samples convert to ms?

D

David Elsbury

Freshman
Jan 13, 2012
12
0
0
Auckland, New Zealand
Hi all
Newbie on the SI Expression (2) - quick question, I will be doing a gig with IMAG next week and I want to delay everything to match the delay that is on the screen - easy enough, will get a guy to hit a couple of drumsticks together then delay up to match it. But I want to then delay the fills, delay line, my console monitor send to match this.

When I go to dial up a delay, I have "smp" (samples?) up to 95smp, then 2.00ms .

How do I know what, say, 1 ms is in samples?
Or does it not really matter?

Thanks :)
David
 
Re: Soundcraft SI Expression - Delay - Samples convert to ms?

David Elsbury said:
Hi all
Newbie on the SI Expression (2) - quick question, I will be doing a gig with IMAG next week and I want to delay everything to match the delay that is on the screen - easy enough, will get a guy to hit a couple of drumsticks together then delay up to match it. But I want to then delay the fills, delay line, my console monitor send to match this.

When I go to dial up a delay, I have "smp" (samples?) up to 95smp, then 2.00ms .

How do I know what, say, 1 ms is in samples?
Or does it not really matter?

Thanks :)
David
Click to expand...

Where you set the audio delay to match the video will be important. You will probably not delay the front fill the same as the mains, as the seats those systems cover will be different distances from the speakers that are covering them. The different delay times for each subsystem can be done with any audio, and the console output or speaker processor. The additional delay for the video playback should be done at the input or subgroup level for those sources since it will be different than what you want for microphones, which should need no additional delay.

Mac
 
Re: Soundcraft SI Expression - Delay - Samples convert to ms?

mackerr said:
WThe additional delay for the video playback should be done at the input or subgroup level for those sources since it will be different than what you want for microphones, which should need no additional delay.

Mac
Click to expand...

Hi Mac, thanks for the reply. The cameras will be going into the switcher via SDI, and my experience of using this kit is that there is a visible delay (small, but noticable - haven't measured it) visible on people's lips when speaking. So I thought that I'd try delaying the whole mix to line up to the IMAG.

Am I doing the wrong thing, do you think?

David
 
Re: Soundcraft SI Expression - Delay - Samples convert to ms?

David Elsbury said:
Hi Mac, thanks for the reply. The cameras will be going into the switcher via SDI, and my experience of using this kit is that there is a visible delay (small, but noticable - haven't measured it) visible on people's lips when speaking. So I thought that I'd try delaying the whole mix to line up to the IMAG.

Am I doing the wrong thing, do you think?

David
Click to expand...

Check throughout the room, it will be different everywhere because video travels at the speed of light and sound travels at, well, the speed of sound. The extra delay may work further back, but be distracting to the people up front, who may well be the important people.

Mac
 
Re: Soundcraft SI Expression - Delay - Samples convert to ms?

mackerr said:
Check throughout the room, it will be different everywhere because video travels at the speed of light and sound travels at, well, the speed of sound. The extra delay may work further back, but be distracting to the people up front, who may well be the important people.

Mac
Click to expand...

Point taken, thanks. Will see how much delay is actually involved and see if it's too unnatural.

Any thoughts on the samples/milliseconds thing?

I assume the desk introduces some latency anyway, being a digital desk (compared to an analog console)?

Thanks :)
 
Re: Soundcraft SI Expression - Delay - Samples convert to ms?

The Si Expression shows the delay in samples, milliseconds, feet and meters all at once whenever you spin the delay knob.
Click to expand...

Thanks, for some reason this isn't the case on the "monitor" output patch ("control room output"). I measured it out and dialled it in by ear in the end,

Cheers
David
 
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