Someone needs to make Zimmerman scream

[Enrique]

so the experts can compare his voice to the voice on the 911 call.

Not sure how, maybe with a fake spider.

[Quixote1818]

1. I think they already did that

I read it yesterday. So, my guess is that because he WAS indited means there wasn't a voice match. Meaning Zimmerman is toast.

[tularetom]

2. He may have lots of opportunities to scream

if he winds up in the general prison population.

[Ezlivin]

3. There's already a Wilhelm Scream.

I don't know that a Zimmerman Scream could take its place.

http://hollywoodlostandfound.net/wilhelm/

[HooptieWagon]

4. The next day, supposedly.

Cops and Zimmerman were reinacting the fight the following day. Cops supposedly had Zimmerman lay on his back and yell for help. Read that somewhere a couple weeks ago.

[jberryhill]

5. "Not sure how"

With a warrant, same as anything else.

However, there is an additional Fifth Amendment aspect to compelling someone to speak in an effort to obtain evidence against himself.

The resolution is that what is sought in such an instance is not "testimony" but information about the physical pattern of his voice, in which case a warrant would suffice, just as it would for gathering medical exam evidence, etc.

[exboyfil]

6. Doesn't the fact that he participated in this experiment

indicate that he was the one screaming? He gets a voice match and the road to acquittal is much easier. If he was not the one screaming, why would he ever do it?

[jberryhill]

7. No

Analysis of the recording would indicate, within some stated degree of confidence whether it is his voice.

Whether that has any bearing on anything would be determined at trial, and whatever the jury makes of arguments from either side about what a match does, nor does not, demonstrate.

But voluntarily agreeing to provide a voice sample doesn't prove anything.

If someone tells an officer that it's okay to search their car, does that mean there's not contraband in it?

[LAGC]

8. Why do sex offenders participate in court-ordered polygraphs when they are guilty?

Because they think they can beat it.

Its entirely possible that it was Trayvon screaming, but Zimmerman could have tried to pitch his voice to match it during the re-enactment.

[jberryhill]

9. It's not a question of pitch

The sound produced by your vocal chords, and the harmonics of that which are determined by your throat, mouth and sinuses is the product of your unique physiology. There are invariant characteristics of that, because we are talking about vibrations produced across a harmonic range by two stretched biological membranes. Every little nodule and non-uniformity in those membranes contributes to an overall spectral signature at any given pitch.

It's part of the reason why, for example, many of the best performing groups which use tight harmonies tend to be of siblings, because they are likely to share at least some common structural features of the sound producing apparatus - The Andrews Sisters, The Osmonds, The Roches, The Carpenters, and so on.

[wandy]

10. Voice prints are quite unique.....

You are correct in that, siblings, are likely to share at least some common structural features. Other factors also become involved such as; age, cigarette smoking and alcohol use come into play.
To the human ear two voices may sound very much the same. The digital pattern will be different.
The 'ones and zeros' of a given voice will produce some common patterns whether a whisper or a scream.
These patterns transcend language or even 'cave background noise' (after it is removed).
Enough of a pattern can be detected even within the limited telephone bandwidth.
Given the age differences, and ethnic differences, it would be almost imposable for both voices to produce the same patterns.
Local accents (think Brooklyn) will also contribute to the pattern.

Other considerations:
In some instances multiple samples of each voice may be required to produce a pattern.
Given the frequency range of the human voice and what ever sample rate was used vs. the processing speed of even modern home computers, something akin to audio 'photoshoping' is possible.