Audio Forensics with the National Institute of Standards and Technology (NIST) Method using Formant and Bandwidth Statistical Analysis

Audio Forensik dengan Metode National Institute of Standards and Technology (NIST) menggunakan Analisis Statistik Formant dan Bandwidth

Abstract

Sound recording is one of the digital files that can be used as evidence in a cybercrime case trial. However, sound recordings are vulnerable to manipulation and are changed to hide information in the audio. Audio forensics is a science that analyzes the owner of the sound from the parameters of the pitch, formant, and spectrogram of an audio file. This research analyzes manipulated sound recordings to determine the ownership of audio recordings using formant statistical analysis and bandwidth using the National Institute of Standards and Technology (NIST). The research object used is the original file and the manipulated file, which has mp3 format. Retrieval of data on a smartphone using the live forensic method. The final result of the research succeeded in getting digital evidence on a smartphone with the Oxygen Forensic Suite 2014 application. The results of extracting the application were two audio files. The Analysis of Variance (ANOVA) analysis results can be concluded that nothing is identical because the F ratio value is smaller than F critical, and the probability P-value is more significant than 0.5. The Likehood Ratio (LR) analysis concluded that the sound recording of evidence with sound original limited evidence to against.