Abstract In this chapter, we describe a method of minimum mean-squared error (MMSE) a posteriori estimation of high-variance vehicular noise. The proposed method considers spectral instances of noise as sampled values from a stochastic noise process and estimates them with given statistical properties of noise and current noisy observation. Accuracy of the noise estimation method is evaluated in terms of the accuracy of a spectrum-based voice activity detection (VAD), in which speech presence is determined by the a priori and a posteriori signal-to-noise ratios (SNRs) in each frequency bin. VAD experiments are performed on clean speech data by adding four different types of vehicular noise, each with the SNR varying from −10 to 20 dB. Also, isolated digit recognition experiments are performed using original noisy recordings from the AVICAR corpus. Experimental results show that the proposed noise estimation method outperforms both the MMSE a priori noise estimation and autoregressive noise adaptation methods especially for low SNR.
Estimation of High-Variance Vehicular Noise
2008-10-06
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Minimum mean-squared error estimation , Noise spectrum estimation , Short-time Fourier transform , Periodogram , Voice activity detection , Automatic speech recognition , Speech enhancement , Autoregressive adaptation , Error propagation , Hidden Markov model , Word error rate Engineering , Automotive Engineering , Signal, Image and Speech Processing , User Interfaces and Human Computer Interaction , Communications Engineering, Networks
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