Festival Speech Synthesis System: - Speech Resource Pages

For example suppose we wish to use a dark l (ll) rather than a normal l for all l's that appear in the coda of a
syllable. First we would define a function to which identifies this condition and adds the addition feature
diphone_phone_name identify the name change. The following function would achieve this
(define (fix_dark_ls utt)
"(fix_dark_ls UTT)
Identify ls in coda position and relabel them as ll."
(mapcar
(lambda (seg)
(if (and (string-equal "l" (item.name seg))
(string-equal "+" (item.feat seg "p.ph_vc"))
(item.relation.prev seg "SylStructure"))
(item.set_feat seg "diphone_phone_name" "ll")))
(utt.relation.items utt 'Segment))
utt)
Then when we wish to use this for a particular voice we need to add
(set! diphone_module_hooks (list fix_dark_ls))
in the voice selection function.
For a more complex example including consonant cluster identification see the American English voice `ked' in
`festival/lib/voices/english/ked/festvox/kd_diphone.scm'. The function
ked_diphone_fix_phone_name carries out a number of mappings.
The second method for changing a name is during actual look up of a diphone in the database. The list of alternates is
given by the Diphone_Init function. These are used when the specified diphone can't be found. For example we
often allow mappings of dark l, ll to l as sometimes the dark l diphone doesn't actually exist in the database.
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22. Other synthesis methods
Festival supports a number of other synthesis systems
22.1 LPC diphone synthesizer A small LPC synthesizer (Donovan diphones)
22.2 MBROLA Interface to MBROLA
22.3 Synthesizers in development
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22.1 LPC diphone synthesizer
A very simple, and very efficient LPC diphone synthesizer using the "donovan" diphones is also supported. This
synthesis method is primarily the work of Steve Isard and later Alistair Conkie. The synthesis quality is not as good
as the residual excited LPC diphone synthesizer but has the advantage of being much smaller. The donovan diphone
database is under 800k.
The diphones are loaded through the Donovan_Init function which takes the name of the dictionary file and the
diphone file as arguments, see the following for details