A protocol is described to improve the voice intelligibility of investigative and other forensic audio recordings collected via digital recording systems, whether audio only or audio/video units. Sections are included on the differences between analog and digital recordings used in the forensic field, appropriate laboratory space, applicable equipment and software, enhancement examination procedures, enhancement examples, evidence handling, and expert testimony.
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https://aes2.org/publications/elibrary-page/?id=14163
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