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Electrical network frequency analysis is a forensic science technique for validating audio recordings 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,[1][2]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.
References
- ^ Chris Williams (2010-06-01). "Met lab claims 'biggest breakthrough since Watergate'". The Register.
- ^ Catalin Grigoras. "Digital Audio Recording Analysis: The Electric Network Frequency Criterion" (PDF). Diamond Cut Productions, Inc.
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