He argues that in signing those accords Yasser Arafat put the principles of recognition and a possible two-state solution ahead of the need to stop the process of Israeli colonisation which was shredding one of those two states to ribbons.
But audio experts say that the basic principles the CIA uses are likely the same ones that have driven the field of voice recognition since the 1940s: use of a spectrogram, a visual representation of the frequencies of human speech.