any audio experts, please help

J

jimstamos

Active member
Not that this it matters, but I was shooting on a dsr300 where I always get flawless audio., but heres my issue that I hope someone who is up on audio can help me...:

I taped a program with a direct feed from the sound board. sound checks gave me perfect audio. when the program, the audio was alittle strong.
i eventually, went with my wireless from the board and the audio was great. when the audio set up my cabling, he had the xlr cables 6"s apart from the ac feed i had into my camera for ac power.he told me later, this is crucial to do to avoic and audio issues.
with regards to my problem, after the sound check and all was well someone set up a small camcorder next to me and used the same power strip i was on, but instead of leaving it where it was, he moved it and was on top of the xlr cables. audio guy said this is what caused the problem.
after we listened the the messed up audio, he said i could use audio filters to correct the problem. now here is where i dont remember his suggestion. he said something like adusting the audio to 60mhz or remove the 60mhz something to do with this and it will be corrected.
i know the filters in edius dont apply here, i dont believe, but im wondering what programs could solve my problems? possible sound forge? others??
help appreciated.
and if youre clear on my problem and think you know what can correct the problem, details on how to do this would be greatly appreciated.

thanks
jim
 
It's a little hard to understand, but from what you wrote, it sounds like the problem is a hum in your audio. You can use a filter to take it out, but it might not get it all out. A good notch filter should do the trick.

Oh, the person who moved the power strip should have had enough brains to know not to do that. Once I have something like that set, I put a piece of white gaff tape on it, and write "do not move" on it. If someone does move it, I stab them in the neck, and they usually won't do it again.

-Dave
 
Adobe Audition, a.k.a. Cool Edit Pro, has a notch filter with presets for taking out a 60hz hum and it's harmonics.

I don't know, Dave. From what I've seen, people who need AC power to run a small camcorder typically have no clue as to what they are doing. Your solution has crossed my mind. :)

-Dan
 
ya from what i gather it apears to be a 60hz problem, few basic reasons why you get that hum,
1, grounding problem, A.K.A. ground loop, uasually with the house electrical system, thats why stage lighting and house sound electrical pannels are wired seperatly, and independent of each other ( say at a some venue)

solution: try to power your stuff from another outlet, who knows maybe the airconditioner was kicking on. and dont allow scraglers to plug into your power their shotty stuff can mess things up, OWN a good Power strip not some cheapy thing.
1a: grouning problem with your cables, try another XLR, or pick up yours and put on your head phones and listen as see if you hear the hum come and go, if ya do, cut one end off and toss the cable. if ya dont , try another cable anyway. and you should have backups for all sound cables, to and from mic to mixer and camera.

2, problem with the sound board, switch mic input channels, if problem prosists see above,
mini solution, not sure if you have any kind of sweepable eq on your sound board or a button that looks like kinda like this --\ but thats like a low end roll off that can help minimize that hum in some boards depending where its set .

i say its probally a 60hz hum , on your audio editor you can probally pull it out or at least way down. you get the 60hz because in this country electricity travles over the power lines at 60hz , at least thats my understanding, and in europe it 50hz ; PAL

anyway as you see im no expert , but have had years of experiance combatting evil HUMMMMMMMMM......

IF problem keeps up and cant find any solution there are products designed to lessen the visual and audio effects of such interfearance. i cant remember any brand names right now but i did cross upon this site that explains the HUMM a bit better than i ..

http://www.cinemasource.com/articles/gnd_loop.pdf
 
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