Acoustic sensing method for an occlusion area with super-directional sound sources and multiple modulation signal

摘要

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.