Moore machines mealy vs moore nite state automata

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Unformatted text preview: DGMs – Lecture 4 - Jan 23rd, 2013 page 4-86 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore Machines Mealy vs. Moore finite state automata: Input Symbol State Logic Input Symbol Output Symbol State Memory Output Symbol Logic Logic Memory Moore machine has only one possible output for each state — the output is a function only of the current state. Mealy machine has only one possible output for each state-input pair — given current state, the input determines both the next state and the current output. Mealy machine: given a current state, and a next state (determined by input), there is an output. Prof. Jeff Bilmes EE596A/Winter 2013/DGMs – Lecture 4 - Jan 23rd, 2013 page 4-86 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore Machines Mealy vs. Moore finite state automata: Input Symbol State Logic Input Symbol Output Symbol State Memory Output Symbol Logic Logic Memory Moore machine has only one possible output for each state — the output is a function only of the current state. Mealy machine has only one possible output for each state-input pair — given current state, the input determines both the next state and the current output. Mealy machine: given a current state, and a next state (determined by input), there is an output. Hence, we can think of a Mealy machine as one where the output is a function of the transition between two states. Prof. Jeff Bilmes EE596A/Winter 2013/DGMs – Lecture 4 - Jan 23rd, 2013 page 4-86 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore HMMs Mealy (or Jelinek) HMMs are ones where the observation distribution is a function of the transition between states. Prof. Jeff Bilmes EE596A/Winter 2013/DGMs – Lecture 4 - Jan 23rd, 2013 page 4-87 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore HMMs Mealy (or Jelinek) HMMs are ones where the observation distribution is a function of the transition between states. Markov transition diagram often shown with symbols on the edges between state nodes (note, this is not a graphical model, rather a labeled state-transition diagram). Prof. Jeff Bilmes 1 2 all but “(” or “)” all but “(” or “)” “(” “)” EE596A/Winter 2013/DGMs – Lecture 4 - Jan 23rd, 2013 page 4-87 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore HMMs Mealy (or Jelinek) HMMs are ones where the observation distribution is a function of the transition between states. Moore (or Rabiner) HMMs are ones where the observation is a function of the state itself. Markov transition diagram often shown with symbols on the edges between state nodes (note, this is not a graphical model, rather a labeled state-transition diagram). Prof. Jeff Bilmes 1 2 all but “(” or “)” all but “(” or “)” “(” “)” EE596A/Winter 2013/DGMs – Lecture 4 - Jan 23rd, 2013 page 4-87 (of 239) HMMs HMMs as GMs Other HMM queries What HMMs can do MPE Summ Mealy vs. Moore HMMs Markov transition diagram often shown with symbols on...
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This document was uploaded on 04/05/2014.

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