XPost: sci.physics.acoustics, alt.sci.physics.acoustics, sci.geo.oceanography   
   XPost: rec.audio.pro   
      
   On 2012-02-25 kludge@panix.com(ScottDorsey) said:   
      >It's clear you have already crossposted, why not just crosspost to   
      >all relevant groups and drop some of the irrelevant ones?   
   i would agree with that.  These cross posted threads usually   
   turn into noise themselves though .   
      
   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.   
      
      >The thing is, while you can reduce the noise from ships by playing   
      >with hull profiles to improve laminar flow and reduce turbulence,   
      >and playing with prop designs to reduce turbulence and cavitation,   
      >there is nothing you can do about sonar noise.   
      >Because... the whole point of sonar is that it's a loud noise.   
      >What you _can_ do is to move the operating frequency of the sonar to   
      >notes that don't bother mammals, and to do that you need to first   
      >find out what really does bother them.  Which nobody really is   
      >completely sure about, it seems.   
      
   Would agree, and though we might have a bit of knowledge I"d   
   think that for the most part rec.audio.pro is not the   
   appropriate group to which to address such queries.    But,   
   in addition to Scott's discussion of sonar and animals the   
   other question would be if sonar pings at the frequencies   
   that don't harm the animals are effective at doing the job   
   sonar is supposed to do.  I'm no expert in underwater   
   acoustics though, and doubt there are few in this newsgroup   
   .  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   
      
      
      
      
      
      
      
   Richard webb,   
      
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