Like digital forensics, audio forensics deals with identifying, acquiring, analyzing, preserving, and evaluating sound recordings. These sound recordings provide crucial evidence in the case of fraudulent or criminal activity in a court of law.
Carried out by audio forensic experts, the field helps law enforcement officials solve cases and helps with public or private investigations.
Audio forensics’ objective involves establishing audio evidence authenticity by increasing the audibility of low-level sounds and the interpretation of important conversations, or suspects; anything that aids in providing useful information about the crime scene or accidents.
Modern equipment is used to carry out this process. Adaptive filtering techniques and skills are normally required for this job. Below are some types of audio forensic investigations.
1. Authenticity
During the process of determining the authenticity of a certain piece of media, the audio forensic expert authenticates the chain of custody and uses software to validate whether a file is original.
2. Enhancement
When the quality of the audio is somehow compromised, it must be given to audio forensic experts for enhancement. The quality can quickly become compromised by a loud external noise overlapping with the original one, distortion, or an unbalanced signal-to-noise ratio. An audio forensic expert will reduce unnecessary noise to bring the important part of the conversation to the fore.
3. Interpretation
Similar to authenticity and enhancement, audio recordings may be given to an audio forensic expert to evaluate whether the contents are relevant to the case. This involves interpreting background noise for evidence and conversation, identifying the situation, and so forth.
Audio recordings obtained from crime scenes or accidents are normally sent to forensic labs for evaluations. They help provide significant evidence to the authorities in a court hearing.
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