An automated speech recognition system comprises a preprocessor, a speech recognizer, and a task-independent utterance verifier. The task independent utterance verifier employs a first subword acoustic Hidden Markov Model for determining a first likelihood that a speech segment contains a sound corresponding...http://www.google.de/patents/US6292778?utm_source=gb-gplus-sharePatent US6292778 - Task-independent utterance verification with subword-based minimum verification error training
