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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TC: Decomposition of Search History (3/3)• Three basic operations performed– Acoustic-level re-combinations within tree arcsQτ• Viterbi search( t, s;arc) = max[ Q ( t −1,s′; arc) P( s s′; arc)] P( x s;arc)s′– Tree arc extensionsτ( t S ; arc ) = Q ( t − 1, S ; ar c )QM′τ,0 τtarc’s Ms 0arcHQtThe beginning state The ending state– Word-level recombination{ { }m 11mτ⎧⎧ Q ( t,S ; arc )mm−1m−1( v ; t) = max P( v v ) ⋅ max H ( v ; τ ) h( v ; τ , t)2vm−1m−1( v v ) ⋅ max H ( v ; τ )m( t,S ; arc ) = H ( t) = max H ( v ; t)0B1= max⎨Pv1⎩mmax1vm2τ⎨⎩21τHvmmax() τE⎫⎫⎬⎬⎭⎭<strong>Speech</strong> – <strong>Berlin</strong> <strong>Chen</strong> 34
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