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AES-X172 Initiation
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[page updated 2007-11-19]
This project was proposed by Eddy Bogh Brixen, vice chair of working group SC-03-12. It was approved under our rules by Subcommittee SC-03 and assigned to the SC-03-12 Working Group on Forensic Audio.
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TITLE
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AES-X172, Criteria for the authentication of digital audio recordings
using an ENF methodology
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SCOPE
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This report discusses the minimum procedure for the authentication of digital audio recordings intended to be offered as evidence or otherwise utilized in civil, criminal, or other fact-finding proceedings. This authentication is based on the analysis of low-level induced signals at electric-network frequency (ENF).
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OUTPUT INTENT
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Standards Report
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RATIONALE
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The methodology is based on three assumptions:
- The variation of the frequency value in interconnected electrical networks, at the same moment in time, is equal at all points of these networks.
- The frequency variations are not repeatable over a long period of time, and are hence unique.
- The timing accuracy of a digital recording is sufficiently high for these ENF variations to be detected without significant distortion.
This provides a very powerful tool for the authentication of digital recordings carried on any digital media.
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WHO BENEFITS?
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The forensic audio community
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WHY AES?
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AES members have the neccessary expertise.
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(C) 2009, Audio Engineering Society, Inc.
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