CNN CNN Newsroom April 6, 2014 23:23:00
Had it been set to chirp rather than pure pulse so it would be more easily identifiable -- >> listen. >> -- it would sound like this. that's very similar to what you had been playing for days as the example. and it's like -- it's like a combination lock. you can set the chirp to go from one frequency to another. in fact, you can set it one way for one aircraft pinger and another way for another aircraft's pinger. >> so if you're hearing either the tone or the pulse, then you know -- and those bursts, then you know it's not a whale. it's not a military -- >> correct. >> -- other frequency or so...