Objective Quality Evaluation Method for Noise-Reduced Speech

We present a method for objective quality evaluation of noise-reduced speech. The experimental results indicate that residual noise and the distortion of speech and noise influence the perceived degradation of speech quality. Therefore, the proposed method is developed based on the relationship among three factors and subjective quality. We verify the validity of the method by comparing subjective quality of noise-reduced speech with its estimation. The verification results indicate that the correlation between subjective quality and the estimation is sufficiently high. Furthermore, the method can be used to perform assessments on a unique scale regardless of the type of noise.