In this work we aim at compensating the degrading effects of utterance length variability of speaker verification systems, which appear in many typical applications such as forensics. The paper concentrates in the score misalignments due to different utterance lengths, proposing several algorithms for its normalization. In order to test the proposed methods, we have built two corpora from NIST SRE 2006 and 2008 data to simulate high utterance length variability. Results show an improvement of the overall system performance for all the algorithms proposed, which is significant even when score normalization techniques such as T-Norm are used.
Bibliographic reference. Perez-Gomez, Sergio / Ramos, Daniel / Gonzalez-Dominguez, Javier / Gonzalez-Rodriguez, Joaquin (2010): "Score-level compensation of extreme speech duration variability in speaker verification", In INTERSPEECH-2010, 374-377.