An Electric Network Frequency (ENF) signal is the 60 Hz component of an AC power signal that varies over time due to fluctuations in power production and consumption, across the entire grid of a power distribution network. When present in audio recordings, these signals (or their harmonics) can be used to authenticate a recording, time stamp the original, or determine if a recording was copied or edited. This paper will present the results of an experiment to determine if ENF signals in a controlled magnetic field can be detected and extracted from audio recordings made with battery and externally powered audio recording devices.

Authors: Sanders, Richard; Popolo, Peter S.
Affiliations: University of Colorado Denver; National Center for Voice & Speech(See document for exact affiliation information.)
AES Convention: 125 (October 2008) Paper Number: 7643
Publication Date: October 1, 2008
Subject: Forensic Analysis

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