= Frequently Asked Questions =

'''Can I install additional voices/components after the main installation, or do I have to reinstall everything "from scratch"?'''

You can run the installer again and select only the new packages that you wish to install. Make sure you specify the same installation directory as before. This should work OK, maybe with the exception of link creation and uninstaller creation.

It would of course be nicer to have an integrated update manager -- see ticket:8. Help is welcome! :-)


'''What exactly is the license for the software?'''

...

'''How difficult is it to put together the database needed in order to synthesize Hebrew/Italian/Spanish/Hindi/...? Is Mary modular in that sense?'''

Mary is very modular, and a number of modules exist in a language-independent and configurable implementation, but there is still enough work left to do.

For many languages, you could start with the existing MBROLA diphone voices: 
http://tcts.fpms.ac.be/synthesis/mbrola/mbrcopybin.html

You would then need at least the following MARY TTS modules:

 * needed: a Tokeniser, cutting the input into sentences and tokens (it may be possible to re-use source:trunk/java/de/dfki/lt/mary/modules/JTokeniser.java for a number of languages)

 * optional: a text normalisation which expands numbers, abbreviations  etc. into a pronounceable form (but that can be left out at the beginning)

 * optional: a part-of-speech tagger, distinguishing at least between content words and function words

 * crucially needed: a phonemiser, converting the input text into sound symbols, e.g. in SAMPA. This can be based on rules for some languages (probably, Spanish), but a pronounciation lexicon is required for others when the link between spelling and pronounciation is less regular. Then, also, the lexicon must be complemented with "letter-to-sound" rules for unknown words.

 * optional: a prosody assignment module, predicting e.g. ToBI labels based on part-of-speech and other information. 
source:trunk/java/de/dfki/lt/mary/modules/ProsodyGeneric.java, written by my student Stephanie Becker, may be a good place to start.

 * needed: a duration assignment module, predicting phone durations. As a very first start, the Klatt rules as currently used in the Tibetan language component: source:trunk/java/de/dfki/lt/mary/modules/tib/KlattDurationModeller 
could be used, of course adapted to the language-specific phoneme set.

 * optional: an intonation contour realisation module. For example, there is a generic source:trunk/java/de/dfki/lt/mary/modules/TobiContourGenerator that can be used for different languages by writing appropriate config files.

 * needed: synthesis, e.g. using MBROLA voices.

So, in summary, for adding a new language, you most crucially need a 
phonemiser, and you need to get at least a tokeniser and a duration 
assigner to work. Assuming that there is already an acceptable MBROLA 
voice for your language.

On the bright side, as data representation is based on Unicode, there 
should be no problem with non-European scripts.