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CNN CNN Newsroom With Carol Costello January 5, 2015 15:48:00

reporter: the search for airasia flight 8501 narrowing. the hunt on for a tiny signal in a turbulent sea. minute pings from a device attached to the flight data recorder. a pinger has a specific pulse. it comes at a specific interval and it has specific frequency. correct. but it s still hard to find? yes. it is. reporter: forensic audio expert paul ginsburg simulated what a pinger would sound like undistorted and without by this competing sounds. [ pinging ] but, says ginsburg there is plenty of other things at the bottom of the sea. a school of fish swimming currents echoes from the signal bouncing off different rock formations at the bottom. reporter: this signal he says, is what an experienced operator might initially hear. ....

The Search For Airasia , Flight Data Recorder , Paul Ginsburg , Forensic Audio Expert , School Of Fish Swimming Currents , Rock Formations ,

CNN CNN Newsroom January 3, 2015 19:32:00

Pingers which send out signals under water. it s called the underwater locator beacon in fact on this image. miguel marquez sat down with an expert to find out what it will sound like under water. reporter: the search for airasia 8501 narrowing the hunt on for a tiny signal in a turbulent sea. minute pings from a device attached to the flight data recorder. a pinger has a specific pulse. it has comes at a specific interval and a specific frequency. correct. reporter: but still hard to find. yes, it is. reporter: forensic audio expert paul ginsburg has simulated what a pinger would sound like undistorted and without any competing sounds. [ beeping ] but says ginsburg there is plenty competing for attention at the bottom of the sea. a school of fish swimming, currents echoes from the signal ....

The Search For Airasia , Underwater Locator Beacon , Miguel Marquez , Flight Data Recorder , Hunt On , Paul Ginsburg , School Of Fish Swimming ,