Forensic Investigation of MP3 Audio Recordings
| Autor: | A. G. Boyarov, I. S. Siparov |
|---|---|
| Jazyk: | ruština |
| Rok vydání: | 2020 |
| Předmět: |
forensic video and audio examination
digital audio forensics mp3-encoding detection of double mp3 compression tampering detection audio authenticity analysis mp3-frames headers frame shift offsets sc-fragment mp3 file frame allocation map pn-formula Social pathology. Social and public welfare. Criminology HV1-9960 |
| Zdroj: | Теория и практика судебной экспертизы, Vol 14, Iss 4, Pp 125-136 (2020) |
| Druh dokumentu: | article |
| ISSN: | 1819-2785 2587-7275 |
| DOI: | 10.30764//1819-2785-2019-14-4-125-136 |
| Popis: | Special aspects of MP3-recordings technical investigation are addressed. The following features of formation and research of MP3 phonograms are explained: traces of MP3 coding in time and spectral domain, special aspects of MP3-files structure analysis, detection methods of re-coding of MP3-recordings, methods of group identification of MP3-recorders and MP3-codecs.MP3 coding leaves certain traces of its usage. Due to the psychoacoustic model inaudible spectral components are deleted from the signal spectrum. Traces of psychoacoustic codecs usage are also clearly seen via dynamic spectrogram as rectangular areas of zero spectral amplitude. The methods discussed in this paper enable the investigating expert to detect the exact position of the MP3 frame in the signal by its properties even without any information from the file header. This method reveals the coding itself, multiple coding and also audio editing by the investigation of the periodicity of the extracted frames’ positions.MP3 file format specifies the structure of the frame header providing a perfect instrument to detect any periodicity of any peculiarities of MP3 frames. The tool based on this approach reveals MP3 frames disorder caused by editing in the “digital” domain – manual deletion of audio information using HEX editor. |
| Databáze: | Directory of Open Access Journals |
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