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OT: Surround Sound Question

Discussion in 'Archive' started by WishesFan, Dec 16, 2005.

  1. WishesFan

    WishesFan Member

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    I?m sorry to post something so random, but here?s what I?m trying to do. I have a recording with a voice-over in mono (in the middle of the mix) and there is music and sound effects in the surround sound channels (not in spread stereo, in surround sound.) Does anyone know how I can cancel the surround sound channels and just have the mono voice-over left? Thanks sooooooooo much!!!!

    Have a great day,
    -Rick
     
  2. Chris Lang

    Chris Lang Member

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    I doubt there are any free programs out there that do this (I supposed a program like Adobe Audition might). A 'poor mans' way might be to take a surround sound reciever, run the mix into it, and take the mono center channel output and run it into your computer's sound card.
     
  3. thx99

    thx99 Real-life Harry Caul Moderator Playlist Author

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    I'm not quite sure what sort of recording you have.

    Is it a 2-channel recording, which when played through a Dolby Pro Logic system, outputs a voice-over in the center speaker and "music and sound effects in the surround sound channels"?

    If so, you can try opening the 2-channel file in an audio editing program like Sound Forge, Adobe Audtion, GoldWave, etc., and simply converting the file to a monaural file via mixing the two channels together. Assuming that the music/effects are out of phase between channels and nearly the same level, they will "cancel" each other out during the mixing phase. And the voice-over should not be affected too much (if at all), assuming that it is in phase between channels.

    If you have some other sort of file, could you provide more detail about it?
     
  4. WishesFan

    WishesFan Member

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    The file is a sound clip of the "Tower of Terror" attraction preview from the 2002 vacation planning DVD. Rod's voice over is in the center and the other sounds are in the surround channels. I'm trying to get his voice by itself. You can download the file from--

    http://www.towerofterror.org/media/audio/a...ion_preview.mp3

    Thanks for your help!
    -Rick
     
  5. ToTnut

    ToTnut Member

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    hey rick. E-mail me! I do have this file and you are right, there are sounds in sorround channels. I seem to hear some sound effects in the center channel too but not for the most part.

    You guys should check out the tower of terror.org site. You've heard Ricks visions fantastic music, but did you know he redid the music from the ToT preshow and ride? Pretty incredibal I might say. It's nice to have that to listen to since they never released all the music from the tower.

    -*Tad*-
     
  6. thx99

    thx99 Real-life Harry Caul Moderator Playlist Author

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    Unfortunately, based on the file you provided the link to, extracting the voice completely without the music and sound effects is not possible.

    There are amplitude and phase differences in the music and sound effects between the left and right channels, so they effectively are in "stereo". And the phase differences explain why they can be heard in the surround channels.

    The voice-over, however, is pretty well solid mono.

    So, you can actually perform the opposite of what you're looking to do: you can extract the music and sound effects as a monaural file (contains the differences between the two channels).

    But that doesn't help you!
    :(
     
  7. BLM07

    BLM07 Member

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    Hey, that is my rip. Well I still have the AC3 audio file on my hard drive, but its only stereo. BeSweet can extract each channel out of a AC3, but since it is only stereo that won't help. Besides, is that even the same voice from the ride?
     

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