Editing Carnegie Mellon's Harpy System (section)

=== '''2. Representation of knowledge''' ===
The majority of the knowledge represented in the Harpy system is represented within the '''network''', which is a set of states with '''inter-state connections'''. The network is generated by a network compiler from the '''[[wikipedia:Backus–Naur_form|BNF（Backus–Naur form）grammar]]'''<ref>Backus–Naur form. (2023, September 18). In Wikipedia.https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form</ref>, '''the phonetic dictionary''' of the lexical words, and the '''inter-word juncture rules'''. In the phonetic dictionary, the Harpy system uses a speaker-dependent acoustic-phonetic templates to represent the acoustic realization of the phones. Thus, each state in the network contains the following information: the word (the terminal symbol from the BNF grammar), a unique ID number (every BNF terminal symbol with a unique symbol), the phone (from either the phonetic dictionary or the word juncture rules), a list of prior and following states (all the states that may transition into the current state and all the states to which the current state may transition) 

==== '''2.1 Generation''' ====
The generation of the network in the following steps: the BNF grammar is used to generate a grammar network; each state in the grammar network, which represents a terminal symbol in the BNF grammar, is expanded with a phonetic subnetwork that represents the dictionary spelling for the terminal symbol; word juncture rules are added, and finally, special reduction heuristics are applied.