Pilottone and the related neo-pilottone are special synchronization signals recorded by analog audio recorders designed for use in motion picture production. Before the adoption of timecode by the motion picture industry in the late 1980s, pilottone-sync was the basis of all professional magnetic motion picture sound recording systems, whereas mos...
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http://en.wikipedia.org/wiki/Pilottone
A 60 Hz reference signal recorded onto the audio tape to allow transfer to mag precisely at sound speed, used for Sync Sound filming. (In Europe in it is 50Hz.)
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https://www.encyclo.co.uk/local/21112
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