Reference recordings from the suspect recorder or mobile phone, or a database of reference recordings are necessary for a detailed forensic analysis, including the assessment of previous traces of lossy compression. The scientific framework and best practice guidelines for forensic authentication of digital audio recordings include lossy compression level analysis of the evidence signal. ![]() ![]() Different decoders can be used to convert an original AAC content into a WAV PCM file or audio CD track for further forensic analysis of the signal. Advanced Audio Coding (AAC) is one of the most common digital audio formats that can be found in real forensic casework, such as in Apple and Samsung audio files. doi:Ībstract: This paper presents a study on forensic analysis of lossy compression artefacts on Apple Voice Memos recordings. ![]() Smith, "Forensic Analysis of AAC Encoding on Apple iPhone Voice Memos Recordings," Paper 23, (2019 June.).
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