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CNN CNN Newsroom April 19, 2014 23:54:00

Work. we re going to use examples from night 93 hijacked by al qaeda on september 11th. it s a plane that crashed in a philadelphia field. we want to be very sensitive about how we air these recordings. we re not going to play them in full. only short bites to show you what the original sound data sounded like and what it sounded like after enhancement. so let s start right now by playing the original nalg sound as recorded in the tower on september 11th and then we ll play the enhanced sound. first, the original sound. just underneath, 360. all aboard. now, that was the original sound. so let s play the enhanced sound here just to tell the difference between what it sounded like originally, difficult to hear and discern and after the enhancement, some of which paul worked on. just underneath by hitting 360. is the captain would like to remain seated. ....

Al Qaeda On September 11th , Philadelphia Field , September 11th , Sound Data , Original Sound , Playing The Original Nalg Sound , Tower On September 11th , Al L , Paul Ginsburg ,

CNN CNN Newsroom April 13, 2014 00:38:00

Digital filters and so on. and that makes it a little easier to to ascertain what we re listening to. okay. finally, another round of enhancement using more tools in our tool box and we ll get something that really sounds identifiable. with the exact repetition rate of one second and the period exactly stable. okay. now, just so you know, under the ocean there are lots of different paths that the sound can take. and the effect of this is multiple sounds reaching the receiver which would tend to make echos and make it not as distinct. and that s some of the problem that they have in identifying these sounds. paul, that is fascinating. when you were here last week, ....

Repetition Rate , The Ocean , Paul Gensburg ,

CNN CNN Newsroom April 13, 2014 00:37:00

And why they why they have trouble hearing it. is that ocean rain or is that just how the ocean sounds? no, this is a simulation using a largeme amount of white noise. in the ocean we have white noise but also, as fabien said, a lot of other manmade noises and natural sounds. so what i did was, i employed some forensic audio techniques, some of which were the same that i used in locating the gunshots in the sandy hook shooting 911 tapes. and i want to show you and let you listen to what one level of enhancement of the signal would sound like. you can begin to hear the one-second repetition rate. okay. okay. of course, knowing what the frequency that we re listening for helps so that we can craft ....

Ocean Rain , White Noise , Largeme Amount , The Ocean , Fabien Cousteau , Forensic Audio Techniques , Sandy Hook Shooting ,

CNN CNN Newsroom April 13, 2014 00:52:15

Transcripts for CNN CNN Newsroom 20140413 00:52:15
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Mh370 Pinger , Black Box Pings , Ocean Unenhanced ,

CNN CNN Newsroom April 13, 2014 00:39:00

We re so glad we learned so much from you, every time you come on. so let s let s do it again in order, guys. so this first one is what they re looking for no, enhancement. and then you can hear exactly why they have so much trouble. that s a clear that s clear that s the one that it sounds like right out of the water. that s the way it s supposed to sound. correct. and the second one is that s where we begin. pretty noisy. can you imagine listening for that? you know, hours at a time and 12-hour stretches at a time? and one this one is a little a little bit of enhancement. correct. correct. okay. and this one is this one is the final version and, of course, it could even be improved upon more if we needed ....