Determining recording time of digital soundrecordings using the ENF criterion

University essay from Linköpings universitet/Institutionen för systemteknik

Author: Fredrik Andersson; [2009]

Keywords: ENF; ENF criterion;

Abstract:

In forensic investigations, verification of digital recordings is an important as-pect. There are numerous methods to verify authentication of recordings, but itis difficult to determine when the media was recorded. By studying the electricalnetwork frequency, one can find a unique signature and then match the recordingto this signature. By matching a recorded signal to a database, which contains allnecessary information, one can find the time when the recording was made.

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