Originally posted by Shylock
Jayelles, you've got it wrong and right in what you wrote...LOL
A spectrograph is a very valuable tool to use when doing audio analysis, but it's not the "key" which unlocks all audio secrets. Give a deaf man a spectrograph and what do you have?--a confused deaf man.
You are correct that a spectrograph can tell you where to look. I used one here on the 911 call to pinpoint which part of the tape I wanted to expand for closer analysis and see the results when I applied different filtering techniques.
A spectrograph, by itself, is nothing but a visual display of sound frequencies. It can't tell a squeeky floor board from an opera singer without something to compare it to.
You are right about the audio tape versus the CD. I wish we had a complete version of the call on the audio tape, but that version was cut off just as Patsy's voice appears. We should consider ourselves lucky that someone screwed-up big time and recorded a longer version of the call on the CD.
As far as Dave goes, I wouldn't worry about him. He resides in the swamp. The swamp is full of misinformation. It exists solely to propagate misinformation. Anyone with a brain always figures that out sooner or later and finds their way here or to some other forum of free opinion.