Festival Speech Synthesis System: - Speech Resource Pages

Building the models and getting good figures is only one part of the process. You must integrate this model into
Festival if its going to be of any use. In the case of CART trees generated by Wagon, Festival supports these directly.
In the case of CART trees predicting zscores, or factors to modify duration averages, ees can be used as is.
Note there are other options to Wagon which may help build better CART models. Consult the chapter in the speech
tools manual on Wagon for more information.
Other parts of the distributed system use CART trees, and linear regression models that were training using the
processes described in this chapter. Some other parts of the distributed system use CART trees which were written by
hand and may be improved by properly applying these processes.
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27. Programming
This chapter covers aspects of programming within the Festival environment, creating new modules, and modifying
existing ones. It describes basic Classes available and gives some particular examples of things you may wish to add.
27.1 The source code A walkthrough of the source code
27.2 Writing a new module Example access of an utterance
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27.1 The source code
The ultimate authority on what happens in the system lies in the source code itself. No matter how hard we try, and
how automatic we make it, the source code will always be ahead of the documentation. Thus if you are going to be
using Festival in a serious way, familiarity with the source is essential.
The lowest level functions are catered for in the Edinburgh Speech Tools, a separate library distributed with Festival.
The Edinburgh Speech Tool Library offers the basic utterance structure, waveform file access, and other various
useful low-level functions which we share between different speech systems in our work. See section `Overview' in
Edinburgh Speech Tools Library Manual.
The directory structure for the Festival distribution reflects the conceptual split in the code.
`./bin/'
The user-level executable binaries and scripts that are part of the festival system. These are simple symbolic
links to the binaries or if the system is compiled with shared libraries small wrap-around shell scripts that set
LD_LIBRARY_PATH appropriately
`./doc/'
This contains the texinfo documentation for the whole system. The `Makefile' constructs the info and/or
html version as desired. Note that the festival binary itself is used to generate the lists of functions and
variables used within the system, so must be compiled and in place to generate a new version of the
documentation.
`./examples/'
This contains various examples. Some are explained within this manual, others are there just as examples.
`./lib/'
The basic Scheme parts of the system, including `init.scm' the first file loaded by festival at start-up
time. Depending on your installation, this directory may also contain subdirectories containing lexicons,
voices and databases. This directory and its sub-directories are used by Festival at run-time.
`./lib/etc/'
Executables for Festival's internal use. A subdirectory containing at least the audio spooler will be