Lip-reading

Lip-reading was the ability to understand what an individual was saying without hearing them, only through the movement of their lips.

Gavin Oliver Scott fell in love with Irene Gilbey, who was deaf. He learned lip-reading to help communicate with her. (PROSE: The Least Important Man)

Sam used binoculars (given to her by the Doctor) made in the Filipino Protectorate in 4993 which had lip-reading software. PROSE: Interference - Book One)

The Eye-5 could not transmit sound, but the lens had lip-reading software. It translated lip movements to speech after a delay of a second or two. (TV: Children of Earth: Day Three)