AT&T and Gallaudet University have developed a football helmet for players who are deaf or hard of hearing and communicate using American Sign Language. The company and the Washington-based school for students who are deaf or hard of hearing unveiled the new technology Thursday. It allows a coach to call a play on a tablet from the sideline that then shows up visually on a small display screen inside the quarterback’s helmet. Gallaudet, which competes in Division III, was cleared by the NCAA to use the helmet in its game on Saturday at home against Hilbert. Gallaudet coach Chuck Goldstein said he thinks the helmet “will change football.” “We work out the same way as every other college football program, we practice the same way, we compete the same way,” Goldstein said. “The difference between coaching a hearing team compared to a Deaf team is first the communication.” The final …