This document presents a presentation on silent sound technology. Silent sound technology allows people to transmit information without using their vocal cords by detecting lip movements and converting them to sound signals. It has applications in helping people who have lost their voice communicate over the phone and could allow for confidential phone conversations in public. The technology works using electromyography to detect muscle signals or image processing of ultrasound images of the tongue. In the future, it may be incorporated into cell phones to enable silent calling anywhere. While it could benefit many users, the technology is still under development and may be costly when first introduced.