ROBUST SPEECH RECOGNITION FROM RATIO MASKS

Robustness against noise is crucial for automatic speech recognition systems in real-world environments. In this paper, we propose a novel approach that performs robust ASR by directly recognizing ratio masks. In the proposed approach, a deep neural network (DNN) is first trained to estimate the ideal ratio mask (IRM) from a noisy utterance and then a convolutional neural network (CNN) is employed to recognize estimated IRMs. The proposed approach has been evaluated on the TIDigits corpus, and the results demonstrate that direct recognition of ratio masks outperforms direct recognition of binary masks and traditional MMSE-HMM based method for robust ASR.