Gear / Technical Help > Post-Processing, Computer / Streaming / Internet Devices & Related Activity
Syncing R-44 SBD/AUD Matrix in Audacity (OSX) - have read sticky already
easy jim:
--- Quote from: Walstib62 on January 25, 2010, 12:30:25 PM ---I don't have screenshots, but there is a time shift tool in the upper left. It looks like L/R facing arrows. Zoom in to get a good view, then select the aud track, then select the time shift tool. then just simply slide the entire waveform L/R to line the 2 up. You then do a slight cut of both at the front end, and you are good to go.
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^ absolutely correct
I do not understand the why/what for of chopping off part of one source to align it with the other. The proper alignment of two sources already clock-synced only requires finding an appropriate sync point and then sliding one source (usually the SBD) forward in time across the time ruler. Just line them up on the time ruler, then, and then do your chop/fade at the front and end afterwards.
runonce:
--- Quote from: acidjack on January 25, 2010, 12:20:40 PM ---As noted, I have read the sticky on this already, but I think my question is slightly different.
I have an SBD/AUD matrix recorded on an R-44 with the mics back at the board. The board is maybe 100ft from the stage. As I understand it, there is about a 1millisecond difference for every 50ft one is from the stage.
I hear very little noticeable echo, but certainly looking at the waveforms, the peaks on the aud look visually a touch "later" than the SBD.
The sticky describes lining up two recordings based on samples, which will not work for me, since both have identical numbers of samples given that I used an R-44 that recorded both exactly simultaneously.
My questions are:
1. What is the best way to "line up" the recordings - is there any feature that I'm not thinking of, or do you literally just have to zoom way in and eyeball the peaks?
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Thats basically it...since the tracks are going to be rearranged in time, I dont think knowing the delay factor is terribly relevant. I've always assumed the goal was to have each sources events happen at the same time.
Not sure it can get any easier than Audacity and the Time Shift Tool. Especially for clock synced stuff.
Ultimately you have to look at in an editor...but you can get pretty close listening to the cymbals - ride and bell shots are good checks.
One thing I find is the waveforms dont often resemble each other as much as you might think. So - visually - a single event does help. A loud PA click between songs can be a blessing...snare hits between songs are good too.
You'll notice the output of your final mix will start to have higher peaks as your sources start to sync.
Blend to taste...
Walstib62:
You can't use a constant for the speed of sound. It varies by temp and humidity, mostly temp. There's an online calculator somewhere. Google it.
Syncing sources is actually an interesting and very rewarding exercise. I've preliminarily found a good tool for syncing 2 sources from different machines.
1. Find the total time of both sources.
2. divide the longer by the shorter, resulting in a # slightly over 1.0.
Divide by 100 to get %, then plug that into the speed correction factor.
OR..
Figure that for every 1 hr. of music, more or less..
you use a speed correction factor of .0035%.
Now you can use a simple ratio based on those numbers and your actual time difference. Simple algebra.
I just started on this, and that value may change with some trial, but it's worked well twice so far....
Edit-What I meant to say was that for 1 hr. of music, .100 seconds delay equals .0035% correction factor. So by using a simple ratio,
.0035/.100=x/delay time you can quickly calculate a correction factor for any project. It's worked for me twice now. (hope I'm doing the math correctly) If anyone comes up with a better way, (or if I made a mistake) I'd be interested to hear about it.
Thanks
rocksuitcase:
--- Quote from: Walstib62 on January 25, 2010, 12:30:25 PM ---I don't have screenshots, but there is a time shift tool in the upper left. It looks like L/R facing arrows. Zoom in to get a good view, then select the aud track, then select the time shift tool. then just simply slide the entire waveform L/R to line the 2 up. You then do a slight cut of both at the front end, and you are good to go.
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Thanks for this. I was unsure of how to do this after being presented with the unexpected SBD patch at a recent show. I was about 110 feet away and used 98ms using Audacity with the timeshift tool. Thanks again.!
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