How to use own voice in TTS library

I am using arduino mega (2560) and I have got TTS libraries with others voices. But I want to add my voice to the arduino.How can I do so???
Thanks

I have got TTS libraries with others voices.

Please post a link to these libraries I have not come across them before.

Basically what you have to do is to find out the format of these voices and put your voice into this same format.