Text to speech component enables a voice assistant to synthesise the resulting speech back to the user once the NLU/NLP service has returned the result.

Aimybox provides a ready to use text to speech libraries that can be used by your voice assistant through a dependencies

• Android speechkit
• Google Cloud speechkit
• Yandex Cloud speechkit

If you plan to use another text to speech engine you have to implement TextToSpeech. There are two types of text to speech engines: with SSML support and without it.

If your custom text to speech engine doesn't support SSML out of the box, you have to implement BaseTextToSpeech instead.