MART IN/PE KRONE : GEOGRAPHICAL VARIATION OF AMBIENT NOISE IN THE OCEAN 

 FOR THE FREQUENCY RANGE FROM 1 HERTZ TO 5 KILOHERTZ 



at the same time. I think what you would like to do in the world is 

 not only measure very narrowband statistics, as narrow as the signal 

 will permit you to, but also very narrowbeam, looking in different 

 directions, and very narrow time slots, short-term statistics. 



You want to do all these things. But the cost of doing them is 

 overwhelming, I think. 



Dr. Dyer: Maybe the cost of not doing it is overwhelming. 



Mr. Martin: You have to be very careful what kind of experiments 

 you run, because the cost is so large. But you may be able to design 

 experiments that will give you enough information to use in connection 

 with other measurements, like 1/3-octave, so that you might get a 

 picture that will be useful to the Navy. That is my personal opinion. 



Mr. E. P. Garabed (Naval Air Development Center) : It would be 

 very nice if some distinguished group would make a recommendation on 

 how ambient noise should be reported. Because various groups have 

 various ways of eliminating bad data or ship interference data, and 

 no one reports what that method is. And it is hard to interpret 

 various people's data. So it would be nice if there were a standard 

 format for reporting data. 



Dr. Hersey: I do hope that we will be able to display some of 

 the suspended hydrophone data this evening, and I would suggest 

 that, if we do, nobody say anything about what they think they see 

 in this data but go quietly away to your own laboratories. If you 

 can stand it not to work on this problem and have the results of 

 your work influence the assessment of our understanding of the 

 field, I am sorry for you. 



838 



