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Toffee: enabling ad hoc, around-device interaction with acoustic time-of-arrival correlation

Published: 23 September 2014 Publication History

Abstract

The simple fact that human fingers are large and mobile devices are small has led to the perennial issue of limited surface area for touch-based interactive tasks. In response, we have developed Toffee, a sensing approach that extends touch interaction beyond the small confines of a mobile device and onto ad hoc adjacent surfaces, most notably tabletops. This is achieved using a novel application of acoustic time differences of arrival (TDOA) correlation. Previous time-of-arrival based systems have required semi-permanent instrumentation of the surface and were too large for use in mobile devices. Our approach requires only a hard tabletop and gravity -- the latter acoustically couples mobile devices to surfaces. We conducted an evaluation, which shows that Toffee can accurately resolve the bearings of touch events (mean error of 4.3° with a laptop prototype). This enables radial interactions in an area many times larger than a mobile device; for example, virtual buttons that lie above, below and to the left and right.

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  1. Toffee: enabling ad hoc, around-device interaction with acoustic time-of-arrival correlation

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    cover image ACM Conferences
    MobileHCI '14: Proceedings of the 16th international conference on Human-computer interaction with mobile devices & services
    September 2014
    664 pages
    ISBN:9781450330046
    DOI:10.1145/2628363
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Published: 23 September 2014

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    Author Tags

    1. adi
    2. around device interaction
    3. everyday surfaces
    4. interfaces everywhere
    5. tdoa
    6. time difference of arrival
    7. time of flight correlation
    8. toa
    9. tof
    10. touch interaction
    11. vibro-acoustic sensors

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