Increasing the Robustness of i-vectors with Model Compensated First Order Statistics

Authors : Gökay DİŞKEN, Zekeriya TÜFEKCİ

Pages : 123-137

Doi:10.35414/akufemubid.1134945

View : 20 | Download : 6

Publication Date : 2023-03-01

Article Type : Research Paper

Abstract :Speaker recognition systems achieved significant improvements over the last decade, especially due to the performance of the i-vectors. Despite the achievements, mismatch between training and test data affects the recognition performance considerably. In this paper, a solution is offered to increase robustness against additive noises by inserting model compensation techniques within the i-vector extraction scheme. For stationary noises, the model compensation techniques produce highly robust systems. Parallel Model Compensation and Vector Taylor Series are considered as state-of-the-art model compensation techniques. Applying these methods to the first order statistics, a noisy total variability space training is aimed, which will reduce the mismatch resulted by additive noises. All other parts of the conventional i-vector scheme remain unchanged, such as total variability matrix training, reducing the i-vector dimensionality, scoring the i-vectors. The proposed method was tested with four different noise types with several signal to noise ratios insert ignore into journalissuearticles values(SNR); from -6 dB to 18 dB with 6 dB steps. High reductions in equal error rates were achieved with both methods, even at the lowest SNR levels. On average, the proposed approach produced more than 50% relative reduction in equal error rate.
Keywords : Paralel model kompanzasyonu, Gürbüz konuşmacı tanıma, Vektör Taylor serileri, I vektör