Forensic Investigation of MP3 Audio Recordings
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-recordin...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
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Ministry of Justice of the Russian Federation, Russian Federal Centre of Forensic Science
2020-01-01
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| Series: | Теория и практика судебной экспертизы |
| Subjects: | |
| Online Access: | https://www.tipse.ru/jour/article/view/562 |
| _version_ | 1797872500780040192 |
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| author | A. G. Boyarov I. S. Siparov |
| author_facet | A. G. Boyarov I. S. Siparov |
| author_sort | A. G. Boyarov |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T00:59:46Z |
| format | Article |
| id | doaj.art-ab1896ead73e476b88338718e7a08410 |
| institution | Directory Open Access Journal |
| issn | 1819-2785 2587-7275 |
| language | Russian |
| last_indexed | 2024-04-10T00:59:46Z |
| publishDate | 2020-01-01 |
| publisher | Ministry of Justice of the Russian Federation, Russian Federal Centre of Forensic Science |
| record_format | Article |
| series | Теория и практика судебной экспертизы |
| spelling | doaj.art-ab1896ead73e476b88338718e7a084102023-03-13T10:00:19ZrusMinistry of Justice of the Russian Federation, Russian Federal Centre of Forensic ScienceТеория и практика судебной экспертизы1819-27852587-72752020-01-0114412513610.30764//1819-2785-2019-14-4-125-136500Forensic Investigation of MP3 Audio RecordingsA. G. Boyarov0I. S. Siparov1Федеральное бюджетное учреждение Российский федеральный центр судебной экспертизы при Министерстве юстиции Российской ФедерацииФедеральное бюджетное учреждение Северо-Западный региональный центр судебной экспертизы Министерства юстиции Российской ФедерацииSpecial 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.https://www.tipse.ru/jour/article/view/562экспертиза видео- и звукозаписейэкспертиза цифровых фонограммmp3- кодированиепоиск монтажазаголовки mp3-фреймованализ сдвига границ фреймовнс-фрагменткарта размещения фреймов mp3-файловpn-формула |
| spellingShingle | A. G. Boyarov I. S. Siparov Forensic Investigation of MP3 Audio Recordings Теория и практика судебной экспертизы экспертиза видео- и звукозаписей экспертиза цифровых фонограмм mp3- кодирование поиск монтажа заголовки mp3-фреймов анализ сдвига границ фреймов нс-фрагмент карта размещения фреймов mp3-файлов pn-формула |
| title | Forensic Investigation of MP3 Audio Recordings |
| title_full | Forensic Investigation of MP3 Audio Recordings |
| title_fullStr | Forensic Investigation of MP3 Audio Recordings |
| title_full_unstemmed | Forensic Investigation of MP3 Audio Recordings |
| title_short | Forensic Investigation of MP3 Audio Recordings |
| title_sort | forensic investigation of mp3 audio recordings |
| topic | экспертиза видео- и звукозаписей экспертиза цифровых фонограмм mp3- кодирование поиск монтажа заголовки mp3-фреймов анализ сдвига границ фреймов нс-фрагмент карта размещения фреймов mp3-файлов pn-формула |
| url | https://www.tipse.ru/jour/article/view/562 |
| work_keys_str_mv | AT agboyarov forensicinvestigationofmp3audiorecordings AT issiparov forensicinvestigationofmp3audiorecordings |