Festival Speech Synthesis System: - Speech Resource Pages

`./src/modules/diphone'
An optional module contain the previouslty used diphone synthsizer.
`./src/modules/clunits'
A partial implementation of a cluster unit selection algorithm as described in black97c.
`./src/modules/Database rjc_synthesis'
This consist of a new set of modules for doing waveform synthesis. They are inteneded to unit size
independent (e.g. diphone, phone, non-uniform unit). Also selection, prosodic modification, joining and signal
processing are separately defined. Unfortunately this code has not really been exercised enough to be
considered stable to be used in the default synthesis method, but those working on new synthesis techniques
may be interested in integration using these new modules. They may be updated before the next full release of
Festival.
`./src/modules/*'
Other optional directories may be contained here containing various research modules not yet part of the
standard distribution. See below for descriptions of how to add modules to the basic system.
One intended use of Festival is offer a software system where new modules may be easily tested in a stable
environment. We have tried to make the addition of new modules easy, without requiring complex modifications to
the rest of the system.
All of the basic modules should really be considered merely as example modules. Without much effort all of them
could be improved.
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27.2 Writing a new module
This section gives a simple example of writing a new module. showing the basic steps that must be done to create and
add a new module that is available for the rest of the system to use. Note many things can be done solely in Scheme
now and really only low-level very intensive things (like waveform synthesizers) need be coded in C++.
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27.2.1 Example 1: adding new modules
The example here is a duration module which sets durations of phones for a given list of averages. To make this
example more interesting, all durations in accented syllables are increased by 1.5. Note that this is just an example for
the sake of one, this (and much better techniques) could easily done within the system as it is at present using a handcrafted
CART tree.
Our knew module, called Duration_Simple can most easily be added to the `./src/Duration/' directory
in a file `simdur.cc'. You can worry about the copyright notice, but after that you'll probably need the following
includes
#include
The module itself must be declared in a fixed form. That is receiving a single LISP form (an utterance) as an
argument and returning that LISP form at the end. Thus our definition will start
LISP FT_Duration_Simple(LISP utt)
{
Next we need to declare an utterance structure and extract it from the LISP form. We also make a few other variable
declarations