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  • Bad audio

    Posted by James Williams on April 17, 2006 at 3:22 pm

    Hello gentlemen
    I shot some video of a subject in an empty room. I pick up the sound on my external cam mic. The audio was apparently bouncing all over the room because I get this echo hall like effect. The audio is clear and useable but i was wondering if there was some way I might reduce some of the(audio in an empty room) effect.
    Thanks
    James Williams

    Ty Ford replied 20 years ago 4 Members · 5 Replies
  • 5 Replies
  • Thaxter Clavemarlton

    April 17, 2006 at 11:19 pm

    Sorry, no.

    That’s why you must take special care in recording the audio correctly at the location.

    An “on-camera mic” is seldom the proper choice for recording dialogue.

    You must get a good microphone, on a boom (or use a lavalier mic) as close to the subject’s mouth as possible.

    A reverberant room can be deadened a bit with sound-absorbing blankets.

    And always (always) wear a good set of over-the-ear headphones, thoughout the shoot, to monitor the quality of any audio that you will be using in a production.

  • James Williams

    April 18, 2006 at 8:28 pm

    Thanks for the advice. I use an excellent Sony external mic with cord attached to the camera. The mic was set-up on a table just under the speaker. The audio is not bad. Is there some sound processing that you know of that might help with some of the echoing.
    J. Williams

  • Ty Ford

    April 19, 2006 at 1:16 am

    No. This is your first lesson in audio 101. 🙂

    You audio can not be fixed. Next time, please use headphones so you can hear the audio as it’s being recorded. I suggest Sony MDR7506 headphones.

    Regards,

    Ty Ford

    Ty Ford’s “Audio Bootcamp Field Guide” was written for video people who want better audio. Find out more at https://www.tyford.com

  • Peter Groom

    April 24, 2006 at 7:18 pm

    Its like a cup of tea (well I am English)
    Once youve put sugar in then all you can do is make another cup if its too sweet.

    If I had a pound for every time someone has called me with this sort of problem.

    There is little you can do (although mixing in some music may distarct the ear a little) but be careful
    Peter

  • Ty Ford

    April 25, 2006 at 3:56 pm

    Well put,

    Ya know. There is actually a way to lessen the effect. I didn’t mention it because 90% of the time, the cure is too expensive for the amount of correction.

    George Massenburg designed a noise reduction box with six faders for Disney a number of years ago to retrieve some audio from old film stock. It did have a capability to remove some slappy artifacts, but that was not its intended use.

    The folks at CEDAR evolved that design to a noise reduction system of their own. It has similar capabilities, but, again, this was NOT designed to be an ambience canceller. I don’t remember the model number of the CEDAR system.

    I don’t know if the Massenburg system is even available anymore. I think the CEDAR system was aboout $8k.

    My review of the Massenburg system is in my OnLine archives.

    I saw Ron and Kathlyn yesterday here at NAB. Great show. I am on assignjment, so I don’t have a lot of time, but If you’re out here and want to talk audio, try my cell; 410.960.0689.

    Regards,

    Ty Ford

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