These sounds are difficult to pinpoint with standard tools like noise reduction and equalization, but they can be identified using a spectrogram.Ī spectrogram shows both the frequency content of a recording and the level of those frequencies over time. These sounds could include anything from a plane flying overhead to someone whistling while people talk. The most complicated issues are the extraneous sounds that are not continuous. The noise floor is usually consistent throughout the recording and can be removed to varying degrees by using noise reduction software.
One of the most common audio issues that I address during an enhancement is noise and other extraneous ‘unwanted’ sounds. Techniques such as adaptive filtering and discrete Fourier transforms are used extensively. Modern audio forensics makes extensive use of digital signal processing, with the former use of analog filters now being obsolete. The primary aspects of audio forensics are establishing the authenticity of audio evidence, performing enhancement of audio recordings to improve speech intelligibility and the audibility of low-level sounds, and interpreting and documenting sonic evidence, such as identifying talkers, transcribing dialog, and reconstructing crime or accident scenes and timelines. To get the most from this site, please enable JavaScript.What is audio forensics? Wikipedia defines audio forensics as the field of forensic science relating to the acquisition, analysis, and evaluation of sound recordings that may ultimately be presented as admissible evidence in a court of law or some other official venue.Īudio forensic evidence may come from a criminal investigation by law enforcement or as part of an official inquiry into an accident, fraud, accusation of slander, or some other civil incident.
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