Abstract
The selection of a suitable threshold is considered essential for the correct performance of automatic enrollment in speaker verification. Conventional methods have faced with the scarcity of data and the problem of an a priori decision, using biased client scores, impostor data, variances, a speaker independent threshold or some combination of them. Because of this lack of data, means and variances are estimated in most cases with very few scores. Noise or simply poor quality utterances, when comparing to the client model, can lead to some scores which produce a high variance in estimations. These scores are outliers and have an effect on the right estimation of mean and specially standard deviation. We propose here an algorithm to discard outliers. The method consists of iteratively selecting the most distant score with respect to mean. If this score goes beyond a certain threshold, the score is removed and mean and standard deviation estimations are recalculated. When there are only a few utterances to estimate mean and variance, this method leads to a great improvement. Text dependent and text independent experiments have been carried out by using a telephonic multisession database in Spanish with 184 speakers, that has been recently recorded by the authors.
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References
S. Furui, “Cepstral Analysis for Automatic Speaker Verification”, IEEE Trans. on Acoustics, Speech and Signal Processing, vol. 29, no. 2, pp. 254–272, 1981.
F. Bimbot, D. Genoud, “Likelihood Ratio Adjustment for the Compensation of Model Mismatch in Speaker Verification”, Proc. Eurospeech’97, pp. 1387–1390.
Q. Li, B.H. Juang, Q. Zhou, C.H. Lee, “Verbal Information Verification”, Proc. Eurospeech’97, pp. 839–842.
D.A. Reynolds, “Comparison of Background Normalization Methods for Text-Independent Speaker Verification”, Proc. Eurospeech’97, pp. 963–966.
G. Gravier, G. Chollet, “Comparison of Normalization Techniques for Speaker Verification”, Proc. RLA2C, Avignon, 1998, pp. 97–100.
J.B. Pierrot, J. Lindberg, J. Koolwaaij, H.P. Hutter, D. Genoud, M. Blomberg, F. Bimbot, “A Comparison of A Priori Threshold Setting Procedures for Speaker Verification in the CAVE Project”, Proc. ICASSP’98, pp. 125–128.
J. Lindberg, J. Koolwaaij, H.P. Hutter, D. Genoud, J.B. Pierrot, M. Blomberg, F. Bimbot, “Techniques for A Priori Decision Threshold Estimation in Speaker Verification”, Proc. RLA2C, Avignon 1998, pp. 89–92.
W.D. Zhang, K.K. Yiu, M.W. Mak, C.K. Li, M.X. He, “A Priori Threshold Determination for Phrase-Prompted Speaker Verification”, Proc. Eurospeech’99, pp. 1203–1206.
A.C. Surendran, C.H. Lee, “A Priori Threshold Selection for Fixed Vocabulary Speaker Verification Systems”, Proc. ICSLP’00, pp.246–249, vol. II.
N. Mirghafori, L. Heck, “An Adaptive Speaker Verification System with Speaker Dependent A Priori Decision Thresholds”, Proc. ICSLP’02, pp. 589–592.
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© 2003 Springer-Verlag Berlin Heidelberg
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Saeta, J.R., Hernando, J. (2003). Automatic Estimation of a Priori Speaker Dependent Thresholds in Speaker Verification. In: Kittler, J., Nixon, M.S. (eds) Audio- and Video-Based Biometric Person Authentication. AVBPA 2003. Lecture Notes in Computer Science, vol 2688. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44887-X_9
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DOI: https://doi.org/10.1007/3-540-44887-X_9
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