Theoretical study of impact localisation limits in tangible acoustic interface applications

Tangible acoustic interface (TAI), the key concept of which is to convert any touchable objects into natural interactive surfaces, is an innovative and exciting idea in human–computer interaction. A key challenge for its development is to accurately locate the tactile interactions. In this reported work, the Cramer-Rao lower bound is utilised to study the theoretical limits of impact localisation using the hyperbolic positioning approach in TAI applications.