Preprint Case Report Version 1 Preserved in Portico This version is not peer-reviewed

Forensic Speaker Verification: Case Report at Brazilian Justice

Version 1 : Received: 7 April 2021 / Approved: 8 April 2021 / Online: 8 April 2021 (17:56:51 CEST)

How to cite: Machado, T.J.; Filho, J.V.; de Oliveira, M.A. Forensic Speaker Verification: Case Report at Brazilian Justice. Preprints 2021, 2021040248 (doi: 10.20944/preprints202104.0248.v1). Machado, T.J.; Filho, J.V.; de Oliveira, M.A. Forensic Speaker Verification: Case Report at Brazilian Justice. Preprints 2021, 2021040248 (doi: 10.20944/preprints202104.0248.v1).

Abstract

This case report investigates 5 real cases which followed legal channels and were judged by Mato Grosso Court in Brazil. Audio systems served as elements of key evidence on those lawsuits. The goal here is to analyze the cases by using a methodology based on the forensic speaker verification by using the Ordinary Least Squares (OLS) algorithm and to compare results with analyses obtained on real cases. The comparative analysis is assessed for time elapsed for obtaining results, as well as results quality. In Brazil, the lawsuit duration is very important, since the Penal Code foresees prescription after a given time, and it may lead to impunity. Results show that the analysis, by using OLS, generates immediate, effective results when compared to those obtained with traditional methodologies on the studied Brazilian lawsuits.

Keywords

forensic speaker comparison; voice processing; ordinary least squares; OLS

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