Several signal types such as sound waves, radio waves, lights, and lasers are currently being used for sensing technology. This study focuses on acoustic sensing in air and it attempts to detect an object in an occluded area. Sound waves in the audible range have a long wavelength. The wraparound of waves is caused by diffraction and it appears conspicuously. Low-frequency sound waves can detect objects that are hidden behind other objects via diffraction. This study investigates occlusion area sensing by using a single transmission with a multiple modulation signal. In addition, a sensing system is proposed that can efficiently identify objects in occlusion area. Applying a multiple modulation signal to sensing systems can reduce the cost of transmitting the coded signals. The results from this investigation demonstrate that the proposed method is feasible to detect objects in occlusion areas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.