Investigation on the performances of APA in forensic noise reduction

Multimedia files, either video or audio, could greatly influence the final verdict of a trial when accepted as evidence. The abundance of free editing software available nowadays make forgeries a very easy operation. Audio messages, even if authentic, in some cases, can be heavily masked by other signals and declared unusable. This paper presents the investigations on the performance of the affine projection algorithm (APA) in recovering a speech signal drowned in a loud musical signal and it represents a contribution to the multimedia forensic domain. The APA was tested in multiple situations showing the top performance limits and how the working parameters influence those limits.