13.1.1 Function

  This program is used to convert input files that represent language models in a number of different formats and output a standard HTK lattice. The main purpose of HBUILD is to allow the expansion of HTK multi-level lattices and the conversion of bigram language models (such as those generated by HLSTATS) into lattice format.

The specific input file types supported by HBUILD are:

1. HTK multi-level lattice files.
2. Back-off bigram files in ARPA/MIT-LL format.
3. Matrix bigram files produced by HLSTATS.
4. Word lists (to generate a word-loop grammar).
5. Word-pair grammars in ARPA Resource Management format.

The formats of both types of bigram supported by HBUILD are described in Chapter 11. The format for multi-level HTK lattice files is described in Chapter 16.