Festival Speech Synthesis System: - Speech Resource Pages

supported to allow smaller databases if desired. A full English LPC plus residual database at 8k ulaw is about 3
megabytes, while a full 16 bit version at 16k is about 8 megabytes.
Group files are created with the Diphone.group command which takes a database name and an output filename
as an argument. Making group files can take some time especially if they are large. The group_type parameter
specifies raw or ulaw for encoding signal files. This can significantly reduce the size of databases.
Group files may be partially loaded (see access strategies) at run time for quicker start up and to minimise run-time
memory requirements.
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21.4 Diphone_Init
The basic method for describing a database is through the Diphone_Init command. This function takes a single
argument, a list of pairs of parameter name and value. The parameters are
name
An atomic name for this database.
group_file
The filename of a group file, which may itself contain parameters describing itself
type
The default value is pcm, but for distributed voices this is always lpc.
index_file
A filename containing the diphone dictionary.
signal_dir
A directory (slash terminated) containing the pcm waveform files.
signal_ext
A dot prefixed extension for the pcm waveform files.
pitch_dir
A directory (slash terminated) containing the pitch mark files.
pitch_ext
A dot prefixed extension for the pitch files
lpc_dir
A directory (slash terminated) containing the LPC coefficient files and residual files.
lpc_ext
A dot prefixed extension for the LPC coefficient files
lpc_type
The type of LPC file (as supported by the speech tools)
lpc_frame_offset
The number of frames "missing" from the beginning of the file. Often LPC parameters are offset by one
frame.
lpc_res_ext
A dot prefixed extension for the residual files
lpc_res_type
The type of the residual files, this is a standard waveform type as supported by the speech tools.
lpc_res_offset
Number of seconds "missing" from the beginning of the residual file. Some LPC analysis technique do not
generate a residual until after one frame.
samp_freq
Sample frequency of signal files
phoneset
Phoneset used, must already be declared.
num_diphones
Total number of diphones in database. If specified this must be equal or bigger than the number of entries in
the index file. If it is not specified the square of the number of phones in the phoneset is used.
sig_band
number of sample points around actual diphone to take from file. This should be larger than any windowing