ACM SIGGRAPH 98 Conference abstracts and applications
PingPongPlus: design of an athletic-tangible interface for computer-supported cooperative play
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
Sensor systems for interactive surfaces
IBM Systems Journal
Dynamo: a public interactive surface supporting the cooperative sharing and exchange of media
Proceedings of the 16th annual ACM symposium on User interface software and technology
TouchLight: an imaging touch screen and display for gesture-based interaction
Proceedings of the 6th international conference on Multimodal interfaces
Onomato planets: physical computing of Japanese onomatopoeia
Proceedings of the 3rd International Conference on Tangible and Embedded Interaction
Skinput: appropriating the body as an input surface
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
A novel human-computer interface based on passive acoustic localisation
HCI'07 Proceedings of the 12th international conference on Human-computer interaction: interaction platforms and techniques
Skinput: appropriating the skin as an interactive canvas
Communications of the ACM
I'll knock you when I'm ready...: reflecting on media richness beyond bandwidth and imitation
Proceedings of the Designing Interactive Systems Conference
Touch & activate: adding interactivity to existing objects using active acoustic sensing
Proceedings of the 26th annual ACM symposium on User interface software and technology
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We describe a novel interface that locates and characterizes knocks and taps atop a large glass window. Our current setup uses four contact piezoelectric pickups located near the sheet's corners to record the acoustic wavefront coming from the knocks. A digital signal processor extracts relevent characteristics from these signals, such as amplitudes, frequency components and differential timings, which are used to estimate the location of the hit and provide other parameters, including the rough accuracy of this estimate, the nature of each hit (e.g., knuckle knock, metal tap, or fist bang), and the strike intensity. This system requires only simple hardware, needs no special adaptation of the glass pane, and allows all transducers to be mounted on the inner surface, hence it is quite easy to deploy as a retrofit to existing windows. This opens many applications, such as an interactive storefront, with projected content controlled by knocks on the display window.