Optional Subsystems

A number of extra subsystems are supported by CHATR but for various reasons are not included in the core distribution. These are mostly alternative synthesizers. Typically they have come from other research systems and/or have copyright problems so are available in ITL for research purposes only.

This appendix describes how you can compile them into a working CHATR system.

The general idea is that the relevant `.tar.gz' file be unpacked in the `chatr/src' directory and the configuration files (`src/include/ch_config.h' and `src/include/config.make.rules' modified to `switch on' the options. The rest should be automatic.

The optional subsystems are held in ITL in `/DB/PI/chatr/optional/'. The following systems are available

ch_nuutalk.tar.gz

An implementation of Nuu_Talk in CHATR. This was removed to simplify copyright issues and also because the CHATR non-uniform unit selection is producing much better synthesis. It was included for close comparison of the two selection techniques.

isard.tar.gz

An LPC diphone synthesis system by Steve Isard at Edinburgh University. We have this for research purposes only. It sounds like a synthesizer.

taylor.tar.gz

The CSTR diphone synthesis system. If required, a diphone database for speaker Gordon can be found under `/DB/PI/chatr/lib/dbs/taylor'. This is a useful comparison between non-uniform unit and diphone synthesis from the same speaker. It is a proprietary system for which ATR has no rights. We have this for research purposes only.

formant.tar.gz

A formant synthesis system taken from rsynth, a free speech synthesis system from the Internet. This was the first voice that CHATR ever used. It is nearly incomprehensible, and not at all fast.

xlelong.tar.gz

Christian Lelong's psola code. It was too unstable (and large) to keep in the distribution, but it offers more options than the remaining psola code. Some parts of this code should be re-integrated at some time in the future.

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