A number of functions are available to allow an utterance's structure to be made available for other programs.
The whole structure, all relations, items and features may be
saved in an ascii format using the function utt.save. This
file may be reloaded using the utt.load function. Note the
waveform is not saved using the form.
Individual aspects of an utterance may be selectively saved. The
waveform itself may be saved using the function utt.save.wave.
This will save the waveform in the named file in the format specified
in the Parameter Wavefiletype. All formats supported by
the Edinburgh Speech Tools are valid including nist, esps,
sun, riff, aiff, raw, alaw and ulaw.
Note the functions utt.wave.rescale and utt.wave.resample may
be used to change the gain and sample frequency of the waveform before
saving it. A waveform may be imported into an existing utterance with
the function utt.import.wave. This is specifically designed to
allow external methods of waveform synthesis. However if you just wish
to play an external wave or make it into an utterance you should
consider the utterance Wave type.
The segments of an utterance may be saved in a file using the function
utt.save.segs which saves the segments of the named utterance in
xlabel format. Any other stream may also be saved using the more
general utt.save.relation which takes the additional argument of
a relation name. The names of each item and the end feature of each
item are saved in the named file, again in Xlabel format, other features
are saved in extra fields. For more elaborated saving methods you can
easily write a Scheme function to save data in an utterance in whatever
format is required. See the file lib/mbrola.scm for an example.
A simple function to allow the displaying of an utterance in
Entropic's Xwaves tool is provided by the function display.
It simply saves the waveform and the segments and sends appropriate
commands to (the already running) Xwaves and xlabel programs.
A function to synthesize an externally specified utterance is provided
for by utt.resynth which takes two filename arguments, an xlabel
segment file and an F0 file. This function loads, synthesizes and plays
an utterance synthesized from these files. The loading is provided by
the underlying function utt.load.segf0.