Large Vocabulary Continuous Speech Recognition - Berlin Chen
Large Vocabulary Continuous Speech Recognition - Berlin Chen
Large Vocabulary Continuous Speech Recognition - Berlin Chen
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Classification of Approaches to LVCSR Along Two Axes• Network Expansion– Dynamic expansion of the search space during the decoding• Tree-structured n-gram network• Re-entrant (word-conditioned) vs. start-synchronous (timeconditioned)– (Full) Static expansion of the search space prior to decoding• Weighted Finite State Transducers (WFST) - AT&T– Composition (A。L。G), Determinization, (Pushing) andMinimization of WFST• Static tree-based representations• Search Strategy– Time-synchronous (Viterbi + Beam Pruning)– Time-asynchronous (A* or Stack Decoding)Breadth-first (Parallel)Best-first (Sequential)<strong>Speech</strong> – <strong>Berlin</strong> <strong>Chen</strong> 5
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