Speaker verification over the telephone

Speaker verification has been the subject of active research for many years, yet despite these eAorts and promising results on laboratory data, speaker verification performance over the telephone remains below that required for many applications. This experimental study aimed to quantify speaker recognition performance out of the context of any specific application, as a function of factors more-or-less acknowledged to aAect the accuracy. Some of the issues addressed are: the speaker model (Gaussian mixture models are compared with phone-based models), the influence of the amount and content of training and test data on performance; performance degradation due to model aging and how can this be counteracted by using adaptation techniques; achievable performance levels using text-dependent and text-independent recognition modes. These and other factors were addressed using a large corpus of read and spontaneous speech (over 250 hours collected from 100 target speakers and 1000 imposters) in French, designed and recorded for the purpose of this study. On these data, the lowest equal error rate is 1% for the text-dependent mode when two trials are allowed per verification attempt and with a minimum of 1.5 s of speech per trial. ” 2000 Elsevier Science B.V. All rights reserved.

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