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This paper investigates a noise robust technique for automatic speech recognition which exploits hidden Markov modeling of stereo speech features from clean and noisy channels. The HMM trained this way, referred to as stereo HMM, has in each state a Gaussian mixture model (GMM) with a joint distribution of both clean and noisy speech features. Given the noisy speech input, the stereo HMM gives rise...
In this paper we investigate stereo-based stochastic mapping (SSM) with context for the noise robustness of automatic speech recognition, especially under unseen conditions. Probabilistic PCA (PPCA) is used in the SSM framework to reduce the high dimensionality of the noisy speech features with context and derive an eigen representation in the noisy feature space for the prediction of clean features...
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