boxes from the malaysian airlines plane. interestingly they were heard outside the search zone. another acoustic event was also detected by the australian ship ocean shield about 300 miles away. so i go now to my panel. paul ginsburg is an audio expert. and then paul, what are the words acoustic event mean to you? i was wondering why they use that term. i assume it means they weren t sure. that there was something that could or could not have been the pinger. it may have been distorted as others have said by the propagation through the water, the variation in speed of the sound between the pinger and the receiver. and it may have been slightly off frequency. it may not have had all the characteristics of what the pinger signal should have. or it may have had the characteristics but they were distorted so they did not want
legitimate or not. if it goes away, unless they can reacquire it, they ll to have put the bigger brothers of this into the water and go looking, do some kind of search pattern. this scans the bottom with sound. it takes long range pictures, a mapping of the bottom, 1,000 meters on each side if it is the bigger vehicle and brings them back so we can locate the wreckage. what is that? this is where they will emanate the sound out. it was recorded on the internal hard drive and you recover the vehicle and you download that data. what is this here? this is its antenna. on the bigger versions, everything will have an antenna. it can talk to satellites, it will have gps over you can pick up gps. it brus all the navigation data
form. [ chirping sound ] you can see it has a different shape as well. i wonder if any of these, either of these is, i don t know, what they prefer, is preferable. is easier to hear. does it make a difference? i might ask the rest of the panel. alan diehl, would you know that? depending upon where in the ocean they are, other possible i m sorry. rick gillespie, would you know that? either of these two preferable? i wouldn t know. there are a lot of sounds in the ocean. i would think you would want to pick something that is least likely to emanate from biological sources. correct. they ve done that with the frequency. they ve got a frequency less likely but it is a signature, if
audio archaeologist. because i dig very low sounds out of noisy situations. like restaurant noise or sometimes cockpit audio. so what do you do, try to figure out who just anything whose voice it is? what the sound is? sometimes. sometimes i want to have a pertinent conversation that happens to be, say, evidence of a crime in a criminal case. and not be listening to everything else that s happening in the restaurant. so my job is to pinpoint or so i said what else could it be? some people said it could be sea life. you said it could be sea life but well, no. i said there are so many characteristics that a pulse from one of these pingers would have that if it if you heard something and detected something that had all of these ar characteristics, then i would say that is what you re dealing
relocating science packages that are left on the sea floor and need to be retrieved later or retrieving fishing gear. anything you really need to get back to that exact spot you put a pinger on it and come back later. do you have any comment, paul, on how far a signal from a commercial application might have traveled? that s difficult to say because we re talking about the medium through which is signal is passing being the water. and whether or not it s still. which, of course, we know it s not. it s moving. also, you may have all sorts of obstructions. whether it s the rest of the aircraft sitting on top of this pinger. or sea walls to the left or right which are impeding the signal. it s almost like an audible signal. it s almost like a sound in a