Abstract
The current ‘state-of-the-art’ in phonetic speaker recognition uses relative frequencies of phone n-grams as features for training speaker models and for scoring test-target pairs. Typically, these relative frequencies are computed from a simple 1-best phone decoding of the input speech. In this paper, we present results on the Switchboard-2 corpus, where we compare 1-best phone decodings versus lattice phone decodings for the purposes of performing phonetic speaker recognition. The phone decodings are used to compute relative frequencies of phone bigrams, which are then used as inputs for two standard phonetic speaker recognition systems: a system based on log-likelihood ratios (LLRs), and a system based on support vector machines (SVMs). In each experiment, the lattice phone decodings achieve relative reductions in equal-error rate (EER) of between 31pct and 66pct below the EERs of the 1-best phone decodings. […]
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