8th European Conference on Speech Communication and Technology

Geneva, Switzerland
September 1-4, 2003


Estimating the Weight of Evidence in Forensic Speaker Verification

Beat Pfister, Rene Beutler

ETH Zurich, Switzerland

In forensic casework, the application of automatic speaker verification (SV) aims to determine the likelihood ratio of a suspect being vs. being not the speaker of an incriminating speech recording. For that purpose, the likelihood of the anti-speaker has to be estimated from the speech of an adequate number of other speakers. In many cases, speech signals of such an anti-speaker population are not available and it is generally too expensive to make an appropriate collection.

This paper presents a practical procedure of forensic SV which is based on a text-dependent SV system and instead of an anti-speaker population, a special speech database is used to calibrate the valuation scale for an individual case.

Full Paper

Bibliographic reference.  Pfister, Beat / Beutler, Rene (2003): "Estimating the weight of evidence in forensic speaker verification", In EUROSPEECH-2003, 701-704.