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We have classrooms that have a CCTV camera and sensitive wall mounted room microphone connected directly to the rear of a DVD recorder which is in turn connected to a TV. The idea is that meetings in the room can be recorded to DVD. The problem is that the Mic is ON the whole time. Therefore the TV audio must be kept down otherwise we get feedback through the TV speakers. This is a pain because when they want to play back the recording the audio is turned up. When they press stop without turning the audio down again on the TV the mic will feedback. Any ideas on how to prevent this. Without having too much user intervention. ie not physically turning the mic off and on.
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A PZM will look like a sort of squashed trapeziod flat on the wall
If you have that, DO NOT put wadding around it. In this case the only way I can think of to cope is to arrange an on/off switch.
Thanks for you reply. The room mic is like nothing I have seen. Its a circuit board mounted in a wall plate. I would say its a home made job. It is pretty sensitive. We could try and reposition them or replace them with overhead mics from the ceiling that would be more direct. Placing a switch to turn the mic off would be any extra level of complexity for the users and I could almost guarantee someone would forget to unmute the mic before recording.
I was wondering if there is an electronic device that could help ie feedback eliminator. Or something the will mute the audio out on the tv during recording and unmute during playback.
No, I'm not trying to be rude. The Behringer Feedback Destroyer is what you're looking for, aka the BFD. You can find it online for <$100.
The guy is worried that a switch will be too much for the operators ... just imagine what they would make of a BFD ;-))But may it could be "set and forget" if there are only a couple of frequencies involved. Not enough info really.
Sorry, I think this one is a bit difficult to work out without seeing it first hand.
See if you can locate a local PA audio guy to have a look.
You need to arrange a mic switch somewhere near the player.Mics near walls will pick up a whole lot more than you expect, some mics are actually designed to (called PZM's iirc), if you have them, you have a problem !!!
Another option to try may be some wadding on the wall around the mic, might just help....... maybe, perhaps. Also look at where the mics are pointing if you do this, point them at where the vocal you want to record will most likely be.
Mind you, wadding may also effect the recording.. oh well :-(
Without more info re type of mic, is a bit hard to help more, sorry.
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