Festival Speech Synthesis System: - Speech Resource Pages

The UniSyn_module_hooks are run before synthesis, see the next selection about diphone name selection. At
present only lpc is supported by the UniSyn module, though potentially there may be others.
An optional implementation of TD-PSOLA moulines90 has been written but fear of legal problems unfortunately
prevents it being in the public distribution, but this policy should not be taken as acknowledging or not
acknowledging any alleged patent violation.
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20.6 Diphone selection
Diphone names are constructed for each phone-phone pair in the Segment relation in an utterance. If a segment has
the feature in forming a diphone name UniSyn first checks for the feature us_diphone_left (or
us_diphone_right for the right hand part of the diphone) then if that doesn't exist the feature us_diphone
then if that doesn't exist the feature name. Thus is is possible to specify diphone names which are not simply the
concatenation of two segment names.
This feature is used to specify consonant cluster diphone names for our English voices. The hook
UniSyn_module_hooks is run before selection and we specify a function to add us_diphone_* features as
appropriate. See the function rab_diphone_fix_phone_name in
`lib/voices/english/rab_diphone/festvox/rab_diphone.scm' for an example.
Once the diphone name is created it is used to select the diphone from the database. If it is not found the name is
converted using the list of alternates_left and alternates_right as specified in the database
declaration. If that doesn't specify a diphone in the database. The default_diphone is selected, and a warning is
printed. If no default diphone is specified or the default diphone doesn't exist in the database an error is thrown.
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21. Diphone synthesizer
NOTE: use of this diphone synthesis is depricated and it will probably be removed from future versions, all of its
functionality has been replaced by the UniSyn synthesizer. It is not compiled by default, if required add
ALSO_INCLUDE += diphone to your `festival/config/config' file.
A basic diphone synthesizer offers a method for making speech from segments, durations and intonation targets. This
module was mostly written by Alistair Conkie but the base diphone format is compatible with previous CSTR
diphone synthesizers.
The synthesizer offers residual excited LPC based synthesis (hunt89) and PSOLA (TM) (moulines90) (PSOLA is not
available for distribution).
21.1 Diphone database format Format of basic dbs
21.2 LPC databases Building and using LPC files.
21.3 Group files Efficient binary formats
21.4 Diphone_Init Loading diphone databases
21.5 Access strategies Various access methods
21.6 Diphone selection Mapping phones to special diphone names
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