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phasing/phase cancellation

Discussion in 'Recording' started by silent_nick, Dec 21, 2003.

  1. silent_nick

    silent_nick Guest

    I am a very inexperienced rookie when it comes to recording and I don't quite get the concept of phase cancellation. Could someone give me a rough explanation? thanks.

    Nick
     
  2. Ethan Winer

    Ethan Winer Active Member

    Nick,

    When a microphone picks up a direct sound and also a delayed version of the same sound, the waveforms are offset. So they combine and create peaks and dips in the frequency response. This results in the familiar hollow "phasey" sound, similar to that of a flanger or phaser effect unit. Understand that this effect is not the sound of phase shift, which by itself is inaudible. What you're really hearing is the severe peaks and dips in the response.

    --Ethan
     
  3. kkemp

    kkemp Guest

    I have an article about it at http://kevinkemp.com/homerecordingtutorial/micing.htm

    Kevin
     
  4. Ethan Winer

    Ethan Winer Active Member

    Kevin,

    > I have an article about it <

    Excellent explanation. :tu:

    --Ethan
     
  5. Chance

    Chance Guest

    HI' all
    I'm new to this forum and would like to add that the next time you watch a news helicopter, take notice that you don't hear much of the chopper's noise. This is because there is an ambient mic in the chopper OUT OF PHASE mixed with the newscasters vocal mic in the chopper. If you can ever take a ride in one of those choppers you will find them to be very LOUD inside
     
  6. Chance

    Chance Guest

    Something else I might add
    If you ever see a low-budget film, notice how when they speak you will hear a sound like a compressor pumping ( and it probably is ) and you will hear the ambient sound get louder. In a typical higher budget shoot there will be an ambient mic out of phase to keep the balance in control for a more natural sound
     
  7. Paladyne

    Paladyne Guest

    is that how noise canceling headphones work?
     

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