Designing Groundless Body Channel Communication Systems: Performance and Implications


We present a comprehensive empirical study on the channel characteristics of BCC systems.

October 14, 2018
ACM Symposium on User Interface Software and Technology (ACM UIST) 2018



Virag Varga (Disney Research/ETH Joint PhD)

Marc Wyss (Disney Research/ETH Joint B.Sc.)

Gergely Vakulya (Disney Research/ETH Zurich)

Alanson Sample (Disney Research)

Thomas Gross (ETH Zurich)

Designing Groundless Body Channel Communication Systems: Performance and Implications


Novel interactions that capacitively couple electromagnetic (EM) fields between devices and the human body are gaining more attention in the human-computer interaction community. One class of these techniques is Body Channel Communication (BCC), a method that overlays physical touch with digital information. Despite the number of published capacitive sensing and communication prototypes, there exists no guideline on how to design such hardware or what are the application limitations and possibilities. Specifically, wearable (groundless) BCC has been proven in the past to be extremely challenging to implement. Additionally, the exact behavior of the human body as an EM-field medium is still not fully understood today. Consequently, the application domain of BCC technology could not be fully explored. This paper addresses this problem. Based on a recently published general purpose wearable BCC system, we first present a thorough evaluation of the impact of various technical parameter choices and an exhaustive channel characterization of the human body as a host for BCC. Second, we discuss the implications of these results for the application design space and present guidelines for future wearable BCC systems and their applications. Third, we point out an important observation of the measurements, namely that BCC can employ the whole body as user interface (and not just hands or feet). We sketch several applications with these novel interaction modalities.

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