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- app_festival is an application that allows one to send text-to-speech commands
- to a background festival server, and to obtain the resulting waveform which
- gets sent down to the respective channel. app_festival also employs a waveform
- cache, so invariant text-to-speech strings ("Please press 1 for instructions")
- do not need to be dynamically generated all the time.
- You need :
- 1) festival, patched to produce 8khz waveforms on output. Patch for Festival
- 1.4.2 RELEASE are included. The patch adds a new command to festival
- (asterisk_tts).
- It is possible to run Festival without patches in the source-code. Just
- add this to your /etc/festival.scm or /usr/share/festival/festival/scm:
- (define (tts_textasterisk string mode)
- "(tts_textasterisk STRING MODE)
- Apply tts to STRING. This function is specifically designed for
- use in server mode so a single function call may synthesize the string.
- This function name may be added to the server safe functions."
- (let ((wholeutt (utt.synth (eval (list 'Utterance 'Text string)))))
- (utt.wave.resample wholeutt 8000)
- (utt.wave.rescale wholeutt 5)
- (utt.send.wave.client wholeutt)))
- [See the comment with subject "Using Debian
- festival >= 1.4.3-15 (no recompiling needed!)" on
- http://www.voip-info.org/wiki-Asterisk+festival+installation for the
- original mentioning of it]
- 2) You may wish to obtain and install the asterisk-perl
- module by James Golovich <james@gnuinter.net>, from
- either CPAN, or his site: http://asterisk.gnuinter.net,
- as this contains a good example of how variable text
- can be tts'd via asterisk, namely the examples/tts-*.agi
- files there. It has been noted that the current expression
- evaluation capabilities of asterisk are not best suited
- for the generation and manipulation of text. AGI scripting
- can be ideal for these sorts of needs. For simpler usage,
- fixed, pre-recorded messages may be more amenable for your
- purposes.
- 3) Before running asterisk, you have to run festival-server with a command
- like :
- /usr/local/festival/bin/festival --server > /dev/null 2>&1 &
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