9/11-investigator
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This "obvious technology available now" is only capable of shifting a voice to a higher or lower octave. It does not have the effect of altering a person's accent, inflection or other speech patterns. In other words, if a person has a thick southern accent the output from the voice changer will still have a thick southern accent at a higher or lower frequency. And it most certainly does not have the realtime ability to match another person's unique voiceprint.
Several here like Sparky, calebprime and Dr. Adequate have expressed their scepticism (post 57, 64, 68, 70, 436) about the availability of (near) realtime voice-morphing software in 2001.
That problem is solved. The technoogy was around:
http://www.washingtonpost.com/wp-srv/national/dotmil/arkin020199.htm
By taking just a 10-minute digital recording of Steiner's voice, scientist George Papcun is able, in near real time, to clone speech patterns and develop an accurate facsimile.
Whereas early voice morphing required cutting and pasting speech to put letters or words together to make a composite, Papcun's software developed at Los Alamos can far more accurately replicate the way one actually speaks. Eliminated are the robotic intonations.
The irony is that after Papcun finished his speech cloning research, there were no takers in the military. Luckily for him, Hollywood is interested: The promise of creating a virtual Clark Gable is mightier than the sword.
Video and photo manipulation has already raised profound questions of authenticity for the journalistic world. With audio joining the mix, it is not only journalists but also privacy advocates and the conspiracy-minded who will no doubt ponder the worrisome mischief that lurks in the not too distant future.
That was feb 1999. Not a big stretch to assume that two-and-a-half year later real time high quality voice morphing was possible for a resourceful agency like the Mossad based on sound samples acquired via eavesdropping by telco-related Israeli firms like Amdocs or Comverse/Verint.
http://www.antiwar.com/orig/ketcham.php?articleid=13506
Let's recapitulate: according to the ICT on 9/11 there were a group of Israeli agents with a list of telephone numbers and voice morphing devices programmed with sound samples from passengers who were at that moment still alive. These phone numbers and sound samples had been obtained by means of eavesdropping. Earlier from a dutch interview I quoted Griffin saying that the transcripts of all the so-called telephone conversations were one-way, not needing intimate knowledge of the circumstances at home.