"As forensic experts, we do not have the proper tools to arrive at a positive ID to conclude the voice is Trayvon yelling for help," Primeau said. "By process of elimination, both Tom and I agree the voice yelling is not Zimmerman. That is our opinion."Quote from MarketMasher:
http://news.discovery.com/tech/george-zimmerman-voice-recognition-120404.html
Trayvon Martin's brother has said that the screams on the tape sound like his brother.
Then they backed off their earlier claims.
It would help us continue our investigation if we could convince George Zimmerman to agree to let a forensic examiner record a sample of his voice screaming in the exact same location as the voice in the 911 call (we would have the same acoustics on the sample which would serve as an exemplar), and use as many of the same electronic components that were used in the recording of the womanâs 911 call where we hear the screaming and the gun shot.
However, in this case all we have is Zimmermanâs voice speaking, not yelling. At this point Tom and I agree based on our skills and what we have to work with that the voice is not George Zimmerman yelling for help. Until we get the right tools, we cannot proceed to determine if the voice is Trayvon.
Right now I believe only one person knows the answer: George Zimmerman.
http://www.audioforensicexpert.com/2012/04/03/audio-authentication/trayvon-martin-follow-up
And, an investigation that indicates the voice analysis may not be all it's cracked up to be.
http://www.wagist.com/2012/dan-linehan/about-those-audio-forsenic-experts