A cleaned-up copy of an audio tape of John F Kennedy's assassination may prove whether killer Lee Harvey Oswald acted alone. The sound recording could strengthen or destroy conspiracy theories if it establishes - as some believe it will - how many shots were fired.
JFK was shot dead in his car in Dallas, Texas on 22 November 1963. The sound of the event was caught by the radio on a nearby police motorcycle, and captured on a plastic Dictaphone belt at police headquarters.
Despite its apparently crucial role in the case, the Dictaphone belt has not been played or copied since 1990, because of fears over its deteriorating state. Now scientists have begun digital scanning of the belt to make a modern copy.
Leslie Waffen, an archivist at the US National Archives, believes digital analysis could be used to remove such extraneous noise as static and distant voices to reveal how many of the sounds were gunshots.
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