REPORT ajmera-rr02-39/IDIAP Robust Speaker Change Detection Ajmera, Jitendra McCowan, Iain A. Bourlard, Hervé EXTERNAL http://publications.idiap.ch/attachments/reports/2002/rr02-39.pdf PUBLIC Idiap-RR-39-2002 2002 IDIAP Martigny, Switzerland Accepted for publication in IEEE signal processing letters Most commonly used criteria for speaker change detection like log likelihood ratio (LLR) and Bayesian information criterion (BIC) have an adjustathreshold/penalty parameter to make speaker change decisions. These parameters robust to different acoustic conditions and have to be tuned. In this letter, we present a criterion which can be used to identify speaker changes in an audio stream without such tuning. The criterion consists of calculating the LLR of two models with the same number of parameters. Results on the Hub4 1997 evaluation set indicate that we achieve a performance comparable to using BIC with optimal penalty term.