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# Mary Text-to-Speech
The Mary Text-to-Speech (TTS) service is a pure Java implementation of a TTS service, which uses the MaryTTS (opens new window) project of DFKI.
While it provides good quality results, it must be noted that it is too heavy-weight for most embedded hardware like a Raspberry Pi. When using this service, you should be running openHAB on some real server instead.
# Configuration
There is no need to configure anything for this service.
# Voices
MaryTTS comes with three packages voices, one for American English, two for German:
> voice voices
marytts:cmuslthsmm cmu-slt-hsmm (en_US)
marytts:bits3hsmm bits3-hsmm (de)
marytts:bits1hsmm bits1-hsmm (de)
# Default Text-to-Speech and Voice Configuration
You can setup your preferred default Text-to-Speech and default voice in the UI:
- Go to Settings.
- Edit System Services - Voice.
- Set MaryTTS as Default Text-to-Speech.
- Choose your preferred Default Voice for your setup.
In case you would like to setup these settings via a text file, you can edit the file runtime.cfg in $OPENHAB_ROOT/conf/services and set the following entries:
org.openhab.voice:defaultTTS=marytts
org.openhab.voice:defaultVoice=marytts:cmuslthsmm
# Supported Audio Formats
The MaryTTS service produces audio streams using WAV containers and PCM (signed) codec with 16bit depth. The sample frequency depends on the chosen voice and ranges from 16kHz to 48kHz.
# Log files
The log messages of Mary TTS are not bundled with the openHAB log messages in the openhab.log file of your log directory but are stored in their own log file at server.log of your log directory.
# Caching
The MaryTTS service uses the openHAB TTS cache to cache audio files produced from the most recent queries in order to reduce traffic, improve performance and reduce number of requests.