The Hidden Markov Models
(short: HMMs) are used successfully in speech recognition for many years.
In the following, we will only discuss those properties of the HMMs which we
will need to understand how they are used in algorithms for speech recognition.
A very detailed introduction into HMMs can be found in [RJ86, Rab89, Jel98],
while early applications are described in [LRS85a, LRS89].