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Old 05-27-2003 | 07:45 AM
  #11  
Woodsy
 
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From: Drouin, Victoria, AUSTRALIA
Default Is this sound normal?
Some thing else is Dopler shift.

when something making a sound is comming closer (siren, prop noise) sound waves are compressed giving the impresion the sound is getting faster and when the sound is going away the sound waves are further apart giving the impresion the sound is getting slower.
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