How to do voice comparison/recognition with AA??

I have a recording of someone speaking now and I want to compare it to a recording from about 30+ years ago to see if I can establish that it's the same person... The voices sound similar in some respects but also different, which might be expected after 30+ years... the voice on the recent recording sounds raspier, etc.  I'm wondering what kind of analysis could be done in AA between the two to try to verify or at least point to whether it might be the same person or not.  I've seen them do things like that on C.S.I. (so of course it must be true!), but I'm not sure what the process or science of that would even be called, so I'm not sure what to search for to find some tips about doing that.

Thanks much,
Shazbot

I'm wondering what kind of analysis could be done in AA between the two to try to verify or at least point to whether it might be the same person or not.

Audition isn't particularly good for that, although you might be able to make and compare spectrographs of identical words being spoken if you can find any - the epiglotis (which controls the harmonic spectrum to a large extent shouldn't have altered that much - unless you only have child recordings to compare with.

There are some more specialised tools available though, and a few shareware or trial versions around too. Try looking at the following links, or Google* 'voice analysis software' for some more.


http://www.visualizationsoftware.com/voicetools.html
http://www-users.york.ac.uk/~dmh8/dmh_pevoc4.htm

* Or any other engine of your choice. Apparently Google doesn't like us to use the word 'Google' as a general purpose verb, especially when potentially referring to other search engines, but I will continue to do so as it's now in the OED. So there!