XPost: sci.physics.acoustics, alt.sci.physics.acoustics, sci.geo.oceanography   
   XPost: rec.audio.pro   
   From: kludge@panix.com   
      
    <0junk4me@nomail.bellsloth.net> wrote:   
   >I'm wondering what his interest is, whether he's just dabbling or he has an   
   >academic interest of some sort.  IF the later I'd think he'd   
   >have already cracked a book or two on the subject.   
      
   There is an outrageous amount of information on the subject in open   
   publications from the US Navy.  A lot of it has to do with very fancy   
   propeller designs.  Expensive propeller designs, mind you, which is   
   why you don't see them on merchant marine vessels.   
      
   The Navy wants to build ships that aren't audible on passive sonar   
   receivers.  Incidentally, some of the problem with building very quiet   
   ships is that animals run into them.   
      
   >  Some of the film sound guys who do underwater   
   >shoots might be able to address it a little more   
   >intelligently than a bunch of live sound and studio rats,   
   >but still, i'd say the oceanographers and others might know   
   >a bit more on the subject.  Here in this group most of us   
   >have a better grasp of acoustic characteristics of air   
      
   It's amazing how the physics are the same.  The reason I got interested in   
   it is because almost all of the research on large phased array microphone   
   systems is Navy-financed stuff.  Beamforming in air is really interesting and   
   a lot of the ocean work can be applied to it.   
   --scott   
      
   --   
   "C'est un Nagra. C'est suisse, et tres, tres precis."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)