The proposed model aims at finding an optimal linear transformation on the Mel-warped DFT features according to the minimum classification error (MCE) criterion. This linear transformation, along with the (NSHMM) parameters, are automatically trained using the gradient descent method. An advantageous...http://www.google.de/patents/US6076058?utm_source=gb-gplus-sharePatent US6076058 - Linear trajectory models incorporating preprocessing parameters for speech recognition
