There's some good baseline material on HMMs in Russell & Norvig [1] (the chapter on "Probabilistic Reasoning over Time") as well as Rabiner's HMM tutorial
[1] https://aima.cs.berkeley.edu/ [2] https://www.cs.ubc.ca/~murphyk/Bayes/rabiner.pdf
There's some good baseline material on HMMs in Russell & Norvig [1] (the chapter on "Probabilistic Reasoning over Time") as well as Rabiner's HMM tutorial
[1] https://aima.cs.berkeley.edu/ [2] https://www.cs.ubc.ca/~murphyk/Bayes/rabiner.pdf