Problems of Forensic Sciences 2009 Vol. 80 (LXXX) 481-486
THE APPLICATION OF POWERLINE HUM IN DIGITAL RECORDING AUTHENTICITY ANALYSIS
Marcin MICHAŁEK
Institute of Forensic Research, Kraków, Poland
Streszczenie
The following paper discusses a method of analyzing the authenticity of digital recordings on the basis of the registered powerline hum. Theoretical aspects of the problem and a description of algorithms for automatic extraction and hum analysis are included. The practical application of the proposed algorithms used in software for working with digital recordings registered by devices of various brands is presented. Furthermore, the paper contains results of tests conducted regarding both automatic verification of the time and date of recording and detection of discontinuity of digital recordings of various quality.
Słowa kluczowe
Authenticity; Digital recording; Powerline hum; ENF Criterion