Uploaded October 2014 | Updated September 2026, 2 hours ago

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Toffee is a new sensing approach that extends touch interaction beyond the small confines of a mobile device and onto adjacent surfaces on which they rest, e.g. tabletops. Our approach requires only a hard tabletop and gravity – the latter acoustically couples mobile devices to surfaces.

Taps on the surface are localized via time difference of arrival (TDoA) correlation, enabling radial around-device interaction without needing to instrument the tabletop.