reverse engineering of acoustic sources (beauchamp james w )


Subject: reverse engineering of acoustic sources
From:    beauchamp james w  <jwbeauch(at)UX1.CSO.UIUC.EDU>
Date:    Fri, 30 Jan 2004 14:24:03 -0600

In the Februrary, 2004 issue of Scientific American, Wayne Hu and Martin White in their article "The Cosmic Symphony" write "...researchers have been able to use [temperature variations of the cosmic microwave background] to precisely estimate the age, composition and geometry of the universe. The process is analogous to determining the construction of a musical instrument by carefully listening to its notes." My question is: Has there been any work in the second area? (I know the reverse has been worked on.) Are the authors trying to say that the cosmic quest is as difficult as the acoustic one, or as easy? Jim Beauchamp Univ. of Illinois Urbana-Champaign PS I note that in their p. 48 figure they have the wrong series of acoustic standing waves.


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