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An expression. we just use subtraction. 80 minus 40 gives me the voice. my voice carries about a 40 db signal to noise ratio and that's what you hear. 20 is 100. it's more than. >> this is a voice analyst for the fbi. all of us is struggling to understand why he's testifying because we thought that any voice analysis that would be introduced in court would not be allowed. we're talking about those 911 tapes and whose voice was on the tapes. sonny, what do you make of this? >> i think i'm just as confused as all of you are. you're right. not only was the decision made that there would be no exp...

The voice. is where he is trying to go think about how crucial it will be if this witness has testified, yes, familiar voice recognition is reline. you get someone on the witness stand that says i am familiar with trayvon martin's voice that would be very important for the state w. rehearing the defense challenge that premise. >> we continue to be surprised this voice analyst was put on in the first place, we thought to keep voice analysis out of the mix, out of the trial now suddenly this witness is testifying an hour-and-a-half. >> he is not saying i believe it was zimmerman or trayvon marti...

Voice analysis expert testifying at george zimmerman's murder trial. the state witness now discussing the recorded screaming of that 911 call that was placed the night trayvon martin was killed. the judge resumed that two weeks ago in fact voice experts could not testify about who was screaming. but this witness still giving sphean overview of the quality of the actual tape right here. >> in this case the screaming ratio was very poor due to the distance between the telephone set in the accept is that was being used. and resumed in a location where the altercation was taking place. of course w...

That's someone yelling "help" over and over for 30 seconds. >> if someone continues to yell with the same phonetic content for 30 seconds, we can still count as one word. and that's far less than what is being required to do meaningful i scientific analysis. >> when you talk about the duration of 30 seconds and maybe sometimes even if it's only 15 seconds or 16 seconds maybe you can do a voice analysis. if it gets to be 14 or 10, it's very questionable. you're talking about the duration of normal speech that would contain as many of these. >> let me talk about the

Agency, it wouldn't have even got to first base. >> wouldn't have gotten to first base with him. >> that's interesting. the judge said it's one thing to have voice analysis of a spoken word. it's another thing to have analysis of a scream. but this is a blow, say some, to the prosecution. >> absolutely. now the prosecution, they cannot rule out it might have been george zimmerman screaming for help. we had cnn legal analyst mark nejame give his opinion about why this is such a bad ruling for the prosecution. let's listen. >> what the state was trying to get in is their witness who ended up hav...