Hidden Markov Models for ASR
Intro to Hidden Markov Models, comparison to DTW.
dynamic time warping (DTW)
Hidden state sequences and alignment
Hidden state sequence, Trellis (i.e. lattice) representation of an HMM, aligning observations to states
grid and lattice
The Viterbi algorithm and token passing
The Viterbi algorithm can be computed on different data structures. The token passing version turns out to be very convenient for ASR.
Tthese two different implementations are simply two different ways to perform dynamic programming.
Origin: Module 9 – Speech Recognition – the Hidden Markov Model
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