Moving Led display using Microcontroller + text to voice converter

Hello guys .. i'm gonna make a major project on this

i want to make moving led display of 2feet long and i want to add a text to voice converter to it

any idea how to add a text to voice converter to it as i have no idea how to do it,..
is there a ic or something which can do it or i'll just have to use some kind of voice recorder ic to it... help me and suggest me guys

any other type of modications to it will b good