A new a priori SNR estimator based on multiple linear regression technique for speech enhancement |
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| Affiliation: | 1. Institute of Physics, University of Oldenburg, Germany;2. School of Electronic and Information Engineering, Dalian University of Technology, China;1. College of Information Engineering, Shenzhen University, Shenzhen 518060, China;2. Shenzhen Key Laboratory of Media Security, Shenzhen 518060, China;3. School of Information Management, Sun Yat-sen University, Guangzhou 510006, China;1. Dept. of Computer Science and Engineering, IIT Madras, Chennai, India;2. Idiap, Institute de Research, Switzerland |
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| Abstract: | We propose a new approach to estimate the a priori signal-to-noise ratio (SNR) based on a multiple linear regression (MLR) technique. In contrast to estimation of the a priori SNR employing the decision-directed (DD) method, which uses the estimated speech spectrum in previous frame, we propose to find the a priori SNR based on the MLR technique by incorporating regression parameters such as the ratio between the local energy of the noisy speech and its derived minimum along with the a posteriori SNR. In the experimental step, regression coefficients obtained using the MLR are assigned according to various noise types, for which we employ a real-time noise classification scheme based on a Gaussian mixture model (GMM). Evaluations using both objective speech quality measures and subjective listening tests under various ambient noise environments show that the performance of the proposed algorithm is better than that of the conventional methods. |
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| Keywords: | Speech enhancement Multiple linear regression Gaussian mixture model |
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