Electrical network frequency analysis: Difference between revisions

Revision as of 06:37, 5 June 2010

Revision as of 09:15, 6 June 2010

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{{hoax}}

'''Electrical network frequency analysis''' is a [[forensic science]] technique for validating [[audio recording]]s by comparing frequency changes in background [[mains hum]] in the recording with long-term high-precision historical records of [[mains frequency]] changes from a database,.<ref>{{cite web|url=http://www.theregister.co.uk/2010/06/01/enf_met_police/|title=Met lab claims 'biggest breakthrough since Watergate'|author=Chris Williams|publisher=The Register|date=2010-06-01}}</ref><ref>{{cite web|url=http://www.diamondcut.com/Downloads/AppNote4DiamondCut.pdf|title=Digital Audio Recording Analysis: The Electric Network Frequency Criterion|author=Catalin Grigoras|publisher=Diamond Cut Productions, Inc}}</ref>in effect treating the mains hum signal as if it was a time-dependent [[digital watermark]] that can be used to identify the time at which the recording was created, and to help detect any edits in the sound recording.

In effec the mains hum signal is treated as if it was a time-dependent [[digital watermark]] that can be used to identify the time at which the recording was created, and to help detect any edits in the sound recording.<ref>{{cite web|url=http://www.forensic.to/ENF%20processed.pdf|title=Using the ENF criterion for determining the time of recording of short digital audio recordings|author=Maarten Huijbregtse, Zeno Geradts|publisher=Netherlands Forensic Institute, Departement Digital Evidence and Biometrics|accessdate=2010-06-06}}</ref><ref> Cooper, A.J: The electric network frequency (ENF) as an aid to authenticating forensic digital audio recordings – an automated approach, Conference paper, AES 33rd International Conference, USA (2008)</ref>

== References ==