Does the monophone mean phonetic symbol in HTK?
If your HMM set is made up of monophone models, then there is one phone per HMM. Biphone and triphone HMMs are models of single phones in the (string-adjacent) context of another one or two phones, respectively. So this is a correspondence between between phone symbols and biphones or triphones also. These terms are different in meaning but refer to things that are often confused. 1) phonetic unit (phonetic symbol) 2) phonemic unit (phonemic or phonological symbol) 3) monophone 4) biphone 5) triphone “Phone” is used to be ambiguous between (1) and (2) when you might have a linguist arguing with you. Good phone sets for speech recognition purposes are always sets of phonemes, not sets of phonetic units. Mono-, bi-, and tri-phones are HMM models, statistical models, not units of human language that reside in human minds or brains or behavior.
