Transcripts for CNN CNN Newsroom 20140407 00:55:00 : vimarsa

and also, les abend. we were talking about those acoustic events that they heard. this is a chirp and a tone. let s hear the pure tone first. like an alarm. [ tone sounds ] this isn t the exact one but this is, you re getting us an example. correct. one that we can hear. the actual one is above our hearing but this would be something like a smoke detector telling you that its batteries are weak. a pure tone. the next one is one other way that they can program the pinger to put out a unique type of wave