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I have an idea what a markov chain is. But when it comes to HMM (hidden markov model) I have a doubt regarding emission matrix. What is emission matrix? I have an idea of transition matrix , current states etc. when coming to simulation (using Matlab) I dont have a choice of ordinary markov chains, only HMM is available. why is it so?

I would like to learn markov chains because of its applications in prediction and music etc.

-Devanand T