Slight ring in lav mic at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > All Things Audio

All Things Audio
Everything Audio, from acquisition to postproduction.


Reply
 
Thread Tools Search this Thread
Old January 24th, 2012, 09:44 AM   #1
New Boot
 
Join Date: Nov 2011
Location: Peoria, Arizona
Posts: 22
Slight ring in lav mic

I had to film a church service the other day. The pastor already had a wireless mic on him to feed their house system; I added a wireless AT899 a few inches below that (probably about 6" below his collar) to feed my Canon XF305.

The audio from my mic was quite good, but I noticed a slight ring during some of his talking. They had just presented the pastor that day with a brand-new acrylic podium that he was standing in front of the majority of the time he was speaking. Could I be picking up some reflections from that? Would there have been any way to avoid that (say, using a cardiod mic vs the omni AT899)? Is there any way to pull that out in post? I tried EQ'ing out some of the frequencies and it helped in some places and not others.
Steve Hontz is offline   Reply With Quote
Old January 24th, 2012, 10:52 AM   #2
Trustee
 
Join Date: Aug 2007
Location: Portland, Oregon
Posts: 1,177
Re: Slight ring in lav mic

Are you saying that the ring wasn't there before the acrylic podium? I wouldn't attempt to guess what could be happening without at least hearing a sample. There are way too many variations and we could be guessing all month.
Richard Crowley is offline   Reply With Quote
Old January 24th, 2012, 11:42 AM   #3
Regular Crew
 
Join Date: Oct 2011
Location: San Diego, CA
Posts: 185
Re: Slight ring in lav mic

Sounds like feedback but it's hard to tell. If you have a spectrum analyzer, see if the ringing is in a narrow band and either EQ it out, which you've tried, or grab a noise sample when he's not talking and use a noise reduction tool with it. GL
Kawika Ohumukini is offline   Reply With Quote
Old January 25th, 2012, 11:57 AM   #4
Trustee
 
Join Date: Jan 2011
Location: Pennsylvania
Posts: 1,359
Re: Slight ring in lav mic

Right now I'm wearing a red shirt. Do you think it's too red? Or maybe you think it's more of an orange.

</sarcasm> Sorry...

In other words, I would want to hear a sample before passing judgement on the source.

In general, if it's more of a resonance, the level of which goes up and down exactly when the level of his voice goes up and down, then perhaps it's a coming from the podium... either a reflection or a resonance within the podium itself.

You might go back and try tapping on the podium and see if you can excite a "wolf tone" there. If so, record that, measure the frequency, and dip it out of the file in question. (In that case the podium should be re-designed and re-built to avoid future problems.)

If you don't find a resonance as above, then it might have been a reflection from the podium.

On the other hand, if it's really a "ring" that lasts in time after his direct voice has died down, then it's more likely a feedback ring from the PA system, or some other resonance within the room. How big was the room?

Please post a sample, and you'll probably get some good opinions. Audio only, high bitrate if possible, no video required, should suffice.
Greg Miller is offline   Reply With Quote
Old January 27th, 2012, 10:31 PM   #5
Inner Circle
 
Join Date: Nov 2004
Location: Baltimore, MD USA
Posts: 2,323
Re: Slight ring in lav mic

Quote:
Originally Posted by Steve Hontz View Post
I had to film a church service the other day. The pastor already had a wireless mic on him to feed their house system; I added a wireless AT899 a few inches below that (probably about 6" below his collar) to feed my Canon XF305.

The audio from my mic was quite good, but I noticed a slight ring during some of his talking. They had just presented the pastor that day with a brand-new acrylic podium that he was standing in front of the majority of the time he was speaking. Could I be picking up some reflections from that? Would there have been any way to avoid that (say, using a cardiod mic vs the omni AT899)? Is there any way to pull that out in post? I tried EQ'ing out some of the frequencies and it helped in some places and not others.
For any of a dozen reasons, I think you were hearing the house feedback. Nothing you can do about that in your situation.

Not through EQ, but maybe via noise reduction software,

Regards,

Ty Ford
Ty Ford is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > All Things Audio

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 08:48 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network