Zimmerman has claimed self-defense in shooting and killing the 17-year-old, who was unarmed. Public outcry continues in the case.
Who is crying for help on the 911 tape has become a key point, as Zimmerman contends Martin was on top of him and slamming his head into the ground.
But a new report casts doubt on that scenario:
Tom Owen, forensic consultant for Owen Forensic Services LLC and chair emeritus for the American Board of Recorded Evidence, used voice identification software to rule out Zimmerman.
The new reports, from the Orlando Sentinel, also says:
Owen, a court-qualified expert witness and former chief engineer for the New York Public Library's Rodgers and Hammerstein Archives of Recorded Sound, is an authority on biometric voice analysis — a computerized process comparing attributes of voices to determine whether they match.
After the Sentinel contacted Owen, he used software called Easy Voice Biometrics to compare Zimmerman's voice to the 911 call screams.
"I took all of the screams and put those together, and cut out everything else," Owen says.
The software compared that audio to Zimmerman's voice. It returned a 48 percent match. Owen said to reach a positive match with audio of this quality, he'd expect higher than 90 percent.
"As a result of that, you can say with reasonable scientific certainty that it's not Zimmerman," Owen says, stressing that he cannot confirm the voice as Trayvon's, because he didn't have a sample of the teen's voice to compare.
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