[rwilson452]

I would like to add a little about analyzing voices from a phone. The telephone service only send from 300 to 3000 htz. Using only that band width it is difficult to get any results from a high pitched scream as a large part of the spectrum is lost. In case your wondering. After my military career was over I worked as a telecommunications analyst for many years. In the Navy I was a SONAR tech. my specialty with in that field was as a physical acoustical analyst. I did spectral analysis.