Page 21 - Frequency Range News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Oceans. richard quest is a cnn aviation correspondent and arnold carr joins us. how can they be sure the sound is from a pinger, greg? >> we clearly need more information. i would like to see what kind of hydrophone which is the instrument you hear these things on. an underwater microphone. see which type of hydrophone they are using. a readout and our sonar expert here is probably better equipped to actually look at that. you have to keep in mind there is a lot of sources, potential sources, in the world's oceans for the frequency range. especially if it was heard once. i spent a lot of time ...

Those pings yesterday. they are not very loud. >> they occur in a frequency range not common, that helps resolve it against background noise. there is a problem having to be over the top of it. it assumes all things ideal, density layer, those can act as a mirror and reflect sound away. >> all of a sudden lets say we find something and have to be below. there as ship, not just ro v attached to a ship pitching and rolling. >> you always have to deploy off a ship. even to deploy it off the ship you need ideal conditions. you use a special kind of crane to lower the robot. to do that conditions a...

Had to say this morning. >> my view in this case is that recording isn't even remotely syncable, comparison purposes f it had been submitted to my lab just for prosecution agency, it wouldn't have even gotten to first base. >> what the state's witnesses are saying is that you can make out, once you pull out of that 911 call, the callers a voice and the dispatcher's voice, you can then isolate some of the screams that you hear and compare those to george zimmerman's voice taken from the re-enactment that he did and compare them. basically what they did, richard is took george zimmerman's virks ...

Something. joining us is john, a former ntsb official. and john, thank you. i don't know if you were able to watch the report, but australian authorities agree with the chinese searcher that it is consistent with a black box. if it is not that, what else could it be? >> animals can make sounds like the recorder, maunly whales because they community in about the same frequency range. but the steady 90 second signal is encouraging and i hope and pray for the family's sake it is the box and so they can move on. if it is the box, that moans the work is just beginning. >> you are giving us informat...