How to date a recording using background noise created from the electric grid

AllanR

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Jul 21, 2021
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Interesting technique if you want to put a date stamp on a recording. They use what is called 'electrical network frequency' matching the fluctuation in the noise in the recording with the known fluctuation in the grid.

 
That is interesting, wonder if I'll ever need to use it though! Was the recording analogue or digital? Does it make a difference?
 

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