The 21-year-old was born in Lancashire, and represented Northern Ireland at senior international level, but switched allegiance to the Republic of Ireland last year, and has since played four times for Noel King's under-21 side. The midfielder is also included in King's squad for next week's European U21 Championship qualifier against Turkey.
Barton is a former Blackburn Rovers academy player, but moved to Preston in 2006 and went on to play 50 league games for the Lilywhites. A number of clubs had been interested in Barton, but he signed a three-year deal at the Ricoh Arena today, with manager Andy Thorn pleased to announce the signing.
“This is a great signing for us," Thorn told the club's official webiste. "Adam is a big talent and we think he can do extremely well for us. We’ve brought in a really good blend of younger players and experience so far this summer and Adam is another very good addition.
“He’s attracted a lot of attention from other clubs but we have sold to him what a fantastic opportunity this is for him and that he will be given a chance to shine here at Coventry.
“We can’t wait to get him linking up with the other boys and getting him some games under his belt.”
Barton could make his debut in Tuesday evening's pre-season friendly with Port Vale at Vale Park.