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-   -   Digital Delay for recording (https://www.dvinfo.net/forum/all-things-audio/66181-digital-delay-recording.html)

Alan Kirby April 28th, 2006 02:37 PM

Digital Delay for recording
We are recording a High School musical coming up and have had some discussion already on this board about it.

The speaking actors will have body packs, although not turned up real loud. There will be an orchestra in the pit. I believe there will be singing from people some possibly without mikes.

We are considering using a Rode NT3 Super Cardioid mike back in the house, then adding a digital delay on the board feed to compensate for the distance from the stage to my ambience mike back in the house. That would allow me to have the clarity of the body packs while eliminating at least some of the echo apparent from my rear mike. The switcher I will be using has a frame sync in it anyway which causes a frame or two delay to the video.

Has anyone tried a similar technique? Would a reverb type delay work or is there a specific piece of gear that would be better?

Dan Keaton April 28th, 2006 03:00 PM

The Sound Devices 744T series of recorders have built-in adjustable delays for each of the four inputs.

Other Sound Devices recorders have similar features.

Alan Kirby April 28th, 2006 03:48 PM

Yes, the 744T looks like a sweet piece indeed! After three new HD100 cameras, accessories, support, a component switcher and trying to finish a new editor, probably with the Cineform Prospect and the AJA our budget is gone though. I need to try an solve this for a few hundred at most if I can't borrow one from a friend.

I am interested in the concept of the technique and successful application. Has anyone done this? Perhaps Dan, you have used the 744T this way?

Hey, if I am lucky, maybe Santa will bring a new Sound Devices piece before year's end. Ya never know.

Alan Kirby
All Pro Media, Inc.

David Ennis April 29th, 2006 08:47 AM

At room temperature sound travels through air at 1131 feet per second, a video frame is 1/30 of a second, and that's that. You can preset on that basis.

But with all your investment and effort on video, I think it would be a mistake not to put a person on audio armed with an audio cue sheet for the production, and implement a strategy similar to the one I described in the other thread you cited. The result is sooo much better than a static mix. And after all it is 70% of what you see.....

A. J. deLange April 30th, 2006 07:27 AM

One can advance or delay a sound cut in FCP relative to any other and I immagine the other NLE's also have this capability.

Alan Kirby April 30th, 2006 05:18 PM

A. J.

That may make sense here. Maybe what we should do is record the live mike to channel 1 and the board feed to channel 2. That should make for an easy enough post mix to not take too long.

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