I am delighted to see Mr Ginsberg's reponse to jameson includes the comment:-
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In fact, if there was any periodic sound being introduced as a result of the recording process it would have been present throughout. No such signal was observed.
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This is exactly what my expert said - that a rhythmic mechanical sound would have been present throughout - or at least at intervals. Also, that a spectrograph can differentiate between voice and non-voice anyway.
For the record, jameson's resident "expert" Dave's analysis concluded that:-
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they are NOT voices, and that there is something too mechanical about them, suggesting a mechanical origin.
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http://www.webbsleuths.com/dcf/DCForumID101/1686.html
Dave performed his analysis using a Pentium III computer, a Lite version of some recording software and a program he wrote himself. He did not produce any evidence of the all-crucial spectrographical analysis and when asked about this, he stated that the person asking the question didn't know what they were talking about! (The person asking the question was in fact a very distinguished and well-known Forensic Audio expert!) Dave also failed to provide any proof that his methodology even worked using (say) some of the before/after forensic audio exemplars which are on the Internet.