What is the literature survey about silent sound technology?

A literature survey on silent sound technology explores various methods and applications of transmitting sound without audible noise, often using techniques like ultrasonic waves or bone conduction. This technology has potential uses in communication, military, and entertainment sectors, as well as in healthcare for delivering information directly to patients. The survey examines key studies, technological advancements, and challenges related to the effectiveness, safety, and ethical implications of silent sound methods. Overall, it highlights the growing interest and innovative approaches in this emerging field.