At 10:08 AM 6/19/2005 -0700, John Ross wrote:
>or 2) Very low-level audible RF interference on the recording itself that
>comes from a local radio station, including the location (e.g., the station
>ID) and the date -- maybe a newscast that begins, "It's Tuesday, August
>third 1954, and I'm Announcer's Name with the news for Heaving Springs..."
>or a unique news story that can pinpoint the date, such as a big fire or an
>election. Or maybe the recording itself might be an off-the-air tape from
>the local radio station which the original recordist let run to include the
>station ID and date before the tape ran out.
If the issue is determining Europe or the U.S., the solution is even
easier: measure the hum. There's almost always residual hum and 50 Hz (and
harmonics) can easily be separated from 60.
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