Audio soundtrack on MiniDV tape corrupted by EMF noise, how do I wipe the noise off to get the under

Discussion in 'Amateur Video Production' started by Cymbal Man Freq., Sep 26, 2007.

  1. I recorded a concert of sorts yesterday using external mics plugged into a mixer
    which had a mic level output and that plugged into the mic input on the
    camcorder. I have done this before without any problem like this. The concert
    was in a hotel ballroom with flourescent lights everywhere about 20 feet up.
    There was no headphone jack, so I couldn't monitor during recording; but my VU
    meters on the mics and in the LED VU display on the camcorder seemed to be OK
    during recording. So today I play back the tapes and there is this annoying
    noise at the highest possible audio level across the entire audio spectrum. I
    used a graphic EQ in the stereo system to cut out as much annoying noise as I
    could (8K, 16K, 31, 60 and 125 hz too) so we could check on the concert music.
    What's left is still riddled with this noise that is constant (not breathing or
    pumping as would be the case with Automatic Gain Control turned on if it existed
    in the camcorder). My only thought is the flourescent lights overloaded the
    audio track within the camcorder itself during recording, the video looks fine.

    So my question is how do I get this onto the computer (via firewire) so that I
    can sample this EMF noise and wipe it from the audio track, and leave the audio
    concert material intact.
     
    Cymbal Man Freq., Sep 26, 2007
    #1
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  2. "Cymbal Man Freq." wrote ...
    > So my question is how do I get this onto the computer
    > (via firewire)


    How is it any different than if there weren't any noise?

    You didn't mention what camcorder you are using,
    what computer & software you are using, etc.

    > so that I can sample this EMF noise and wipe it from
    > the audio track, and leave the audio concert material
    > intact.


    Need more info about your situation before any specific
    recommendations can be made. Depending on exactly
    what kind of noise it is, could be that several different
    applications could remove the noise to a greater or
    lesser extent.

    Of course, we are at a tremendous disadvantage not
    acutally hearing the noise under discussion. 10-20
    seconds of sample posted online somewhere will save
    at least 10,000 - 20,000 words of discussion.
     
    Richard Crowley, Sep 26, 2007
    #2
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  3. Cymbal Man Freq.

    Ty Ford Guest

    On Wed, 26 Sep 2007 01:48:58 -0400, Cymbal Man Freq. wrote
    (in article <46f9f2b4$0$18993$>):

    > I recorded a concert of sorts yesterday using external mics plugged into a
    > mixer
    > which had a mic level output and that plugged into the mic input on the
    > camcorder. I have done this before without any problem like this. The concert
    > was in a hotel ballroom with flourescent lights everywhere about 20 feet up.
    > There was no headphone jack,



    No headphone jack on the camera? What camera was that?

    so I couldn't monitor during recording; but my VU
    > meters on the mics and in the LED VU display on the camcorder seemed to be OK
    > during recording. So today I play back the tapes and there is this annoying
    > noise at the highest possible audio level across the entire audio spectrum. I
    > used a graphic EQ in the stereo system to cut out as much annoying noise as I
    > could (8K, 16K, 31, 60 and 125 hz too) so we could check on the concert

    music.
    > What's left is still riddled with this noise that is constant (not breathing
    > or
    > pumping as would be the case with Automatic Gain Control turned on if it
    > existed
    > in the camcorder). My only thought is the flourescent lights overloaded the
    > audio track within the camcorder itself during recording, the video looks
    > fine.
    >
    > So my question is how do I get this onto the computer (via firewire) so that

    I
    > can sample this EMF noise and wipe it from the audio track, and leave the
    > audio
    > concert material intact.


    Sorry for your pain. I don't know.

    Ty Ford



    --Audio Equipment Reviews Audio Production Services
    Acting and Voiceover Demos http://www.tyford.com
    Guitar player?:http://www.youtube.com/watch?v=4RZJ9MptZmU
     
    Ty Ford, Sep 26, 2007
    #3
  4. Cymbal Man Freq.

    nappy Guest

    capture it as you would any other video. Most likely firewire.
    Either perform the noise removal in your editing app, if you have one or
    separate it from the audio and use anyh number of available audio tools to
    affect it
    Use a parametric or notch to find the noise. If it is wide bandwidth you
    will need to try a noise removal method.
    Likely the graphic EQ doesn't have a steep enough roll off.





    "Cymbal Man Freq." <Don't g> wrote in
    message news:46f9f2b4$0$18993$...
    >I recorded a concert of sorts yesterday using external mics plugged into a
    >mixer
    > which had a mic level output and that plugged into the mic input on the
    > camcorder. I have done this before without any problem like this. The
    > concert
    > was in a hotel ballroom with flourescent lights everywhere about 20 feet
    > up.
    > There was no headphone jack, so I couldn't monitor during recording; but
    > my VU
    > meters on the mics and in the LED VU display on the camcorder seemed to be
    > OK
    > during recording. So today I play back the tapes and there is this
    > annoying
    > noise at the highest possible audio level across the entire audio
    > spectrum. I
    > used a graphic EQ in the stereo system to cut out as much annoying noise
    > as I
    > could (8K, 16K, 31, 60 and 125 hz too) so we could check on the concert
    > music.
    > What's left is still riddled with this noise that is constant (not
    > breathing or
    > pumping as would be the case with Automatic Gain Control turned on if it
    > existed
    > in the camcorder). My only thought is the flourescent lights overloaded
    > the
    > audio track within the camcorder itself during recording, the video looks
    > fine.
    >
    > So my question is how do I get this onto the computer (via firewire) so
    > that I
    > can sample this EMF noise and wipe it from the audio track, and leave the
    > audio
    > concert material intact.
    >
    >
    >
     
    nappy, Sep 26, 2007
    #4
  5. Cymbal Man Freq.

    Harry Syme Guest

    "Cymbal Man Freq." <Don't g> wrote in
    message news:46f9f2b4$0$18993$...
    >I recorded a concert of sorts yesterday using external mics plugged into a
    >mixer
    > which had a mic level output and that plugged into the mic input on the
    > camcorder. I have done this before without any problem like this. The
    > concert
    > was in a hotel ballroom with flourescent lights everywhere about 20 feet
    > up.
    > There was no headphone jack, so I couldn't monitor during recording; but
    > my VU
    > meters on the mics and in the LED VU display on the camcorder seemed to be
    > OK
    > during recording. So today I play back the tapes and there is this
    > annoying
    > noise at the highest possible audio level across the entire audio
    > spectrum. I
    > used a graphic EQ in the stereo system to cut out as much annoying noise
    > as I
    > could (8K, 16K, 31, 60 and 125 hz too) so we could check on the concert
    > music.
    > What's left is still riddled with this noise that is constant (not
    > breathing or
    > pumping as would be the case with Automatic Gain Control turned on if it
    > existed
    > in the camcorder). My only thought is the flourescent lights overloaded
    > the
    > audio track within the camcorder itself during recording, the video looks
    > fine.
    >
    > So my question is how do I get this onto the computer (via firewire) so
    > that I
    > can sample this EMF noise and wipe it from the audio track, and leave the
    > audio
    > concert material intact.
    >
    >
    >


    Is it mains hum you are suffering?

    You should always plug your sound recording equipment into the same
    electricity connection that the main mixer is going into otherwise you will
    indeed record mains hum!
     
    Harry Syme, Sep 27, 2007
    #5
  6. Cymbal Man Freq.

    Ty Ford Guest

    On Thu, 27 Sep 2007 08:53:18 -0400, Harry Syme wrote
    (in article <>):

    >
    > "Cymbal Man Freq." <Don't g> wrote in
    > message news:46f9f2b4$0$18993$...
    >> I recorded a concert of sorts yesterday using external mics plugged into a
    >> mixer
    >> which had a mic level output and that plugged into the mic input on the
    >> camcorder. I have done this before without any problem like this. The
    >> concert
    >> was in a hotel ballroom with flourescent lights everywhere about 20 feet
    >> up.
    >> There was no headphone jack, so I couldn't monitor during recording; but
    >> my VU
    >> meters on the mics and in the LED VU display on the camcorder seemed to be
    >> OK
    >> during recording. So today I play back the tapes and there is this
    >> annoying
    >> noise at the highest possible audio level across the entire audio
    >> spectrum. I
    >> used a graphic EQ in the stereo system to cut out as much annoying noise
    >> as I
    >> could (8K, 16K, 31, 60 and 125 hz too) so we could check on the concert
    >> music.
    >> What's left is still riddled with this noise that is constant (not
    >> breathing or
    >> pumping as would be the case with Automatic Gain Control turned on if it
    >> existed
    >> in the camcorder). My only thought is the flourescent lights overloaded
    >> the
    >> audio track within the camcorder itself during recording, the video looks
    >> fine.
    >>
    >> So my question is how do I get this onto the computer (via firewire) so
    >> that I
    >> can sample this EMF noise and wipe it from the audio track, and leave the
    >> audio
    >> concert material intact.
    >>
    >>
    >>

    >
    > Is it mains hum you are suffering?
    >
    > You should always plug your sound recording equipment into the same
    > electricity connection that the main mixer is going into otherwise you will
    > indeed record mains hum!


    I've had some situations in which even gear plugged into the same outlet
    caused hum. ::We were mystified by that one::

    Also, if the joint was wired with a star ground system, you may well be able
    to plug into different outlets and not get a buzz or a hum.

    Regards,

    Ty Ford




    --Audio Equipment Reviews Audio Production Services
    Acting and Voiceover Demos http://www.tyford.com
    Guitar player?:http://www.youtube.com/watch?v=4RZJ9MptZmU
     
    Ty Ford, Sep 27, 2007
    #6
  7. Cymbal Man Freq.

    Guest

    Cymbal Man Freq. <Don't g> wrote:
    : So my question is how do I get this onto the computer (via firewire)

    You attach the camera to the computer, then use any of a number of video
    capture programs (such as in Vegas or another NLE). This produces an .avi
    file, which you can render out as .wav (sound file) only. This can then
    be loaded into any of a number of audio editing programs.

    : so that I can sample this EMF noise and wipe it from the audio track,
    : and leave the audio concert material intact.

    Most noise reduction plugins (like the one for Adobe Audition or
    Cool Edit) allows for sampling and removing the sampled sound. The noise
    has to be very constant for it to work, and you have to find a quiet section
    to sample that contains only the noise.
     
    , Sep 27, 2007
    #7
  8. <> wrote in message
    news:46fbcc09$0$14115$...
    | Cymbal Man Freq. <Don't g> wrote:
    | : So my question is how do I get this onto the computer (via firewire)
    |
    | You attach the camera to the computer, then use any of a number of video
    | capture programs (such as in Vegas or another NLE). This produces an .avi
    | file, which you can render out as .wav (sound file) only. This can then
    | be loaded into any of a number of audio editing programs.
    |
    | : so that I can sample this EMF noise and wipe it from the audio track,
    | : and leave the audio concert material intact.
    |
    | Most noise reduction plugins (like the one for Adobe Audition or
    | Cool Edit) allows for sampling and removing the sampled sound. The noise
    | has to be very constant for it to work, and you have to find a quiet section
    | to sample that contains only the noise.

    I only have Windows Movie Maker 2.1, and maybe a Nero 6 spinoff program that
    I've not seen yet. I do have some other program I downloaded for free which
    could give me .avi files, but it generally locks up after spitting out 100 MB to
    the hard drive from DVD. Does Windows Movie Maker have an audio sample and
    delete function? I have to access that Dell Dimension 4300 computer at another
    domicile, so I don't have all the information I need at my place. I guess the
    Help menu is 150+ pages for WMM, I printed it up but where is it now?

    PS to others: I used a battery powered Radio Shack mixer, a $400 JVC camcorder
    from 3 years ago, no electrical outlets, & my first camcorder battery died in
    the first 3 minutes of recording this even though I recharged it on the
    camcorder the night before. Also, the memory card reader was corrupted (?) the
    next day so I couldn't do much of anything with the camcorder until I ejected
    and reinserted the photo memory card.
     
    Cymbal Man Freq., Sep 27, 2007
    #8
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