hello i am Shovan Maity from the school
of electrical and computer engineering
at purdue university
and today i will present our work on
enabling new introduction modalities
by communicating strictly through touch
using a technique
called electro quasi-static human body
communication
this is a brief outline of my
presentation today we will start with
the motivation behind this work
in the current era of ubiquitous
computing users are submerged in a sea
of computers
with which they are constantly
interacting and touch is one of the most
commonly used interaction method
simultaneous communication with touch
can now enable
new interaction modalities traditionally
it can be done by coupling a touch
sensor
along with some wireless communication
protocol however
these will suffer from selectivity and
security as the signal is transmitted
through
air and is available to any device
within a certain range
and may get communicated even before
touch
now imagine if it is possible to
communicate securely and selectively
strictly during a touch event
electro quasi-static human body
communication or EQS-HBC
potentially provides such a secure
selective and natural way of touch-based
interaction
between users and the environment
in this paper we present the
fundamentals of EQS-HBC
technique which enables strictly
touch-based communication
and demonstrate this property through
three different demos
now let's have a look into the
background of human body communication
first
imagine a scenario when there are
multiple devices around the body
communicating with each other
traditionally radio wave-based
communication methods such as bluetooth
will be used by such devices
human body communication or HBC proposes to
use the conductivity of the human body
to use it as a communication medium
between such devices
HBC enables the body to be used as a
private communication channel by
confining the signal within the body
however there are certain limitations of
current hbc implementations in terms of
signal confinement
most state of the art HBC
implementations uses
signal in the tens of megahertz
frequency range for communication
this results in signal leakage out of
the body
which results in communication even
without touch
when the body is close to the receiver
electroquasistatic human body communication
is a solution to this problem
EQS-HBC confines the signal within a
few centimeters of the body
as seen in the figure on the right
now if we see look into the figure on
the left we see
that when the hand does not touch the
electrode
there is no signal received
through signal confinement EQS-HBC has
now enabled strictly touch-based secure
selective communication
now we look into three different
demonstrations showing these properties
of EQS-HBC
the first demonstration shows the
selectivity property of EQS-HBC
there are two receiver devices whose
electrodes are
right next to each other the user
transmits the red code
and touches one of the receiver
electrodes
the red code gets transmitted to the
corresponding receiver
but the adjacent receiver does not
receive that code
showing selective communication and
minimal signal leakage
from one electrode to the other
the second demonstration shows image
information transfer between a wearable
and a computer when the user hovers his
finger close to the receiver electrode
the image information is not received by
the computer
when the user touches the electrode the
image information gets transferred
from the wearable to the computer
the final demonstration shows secure
authentication through touch
the laptop stays locked when the user
with the correct
unlock code has his finger close to the
electrode
the computer unlocks only when the user
touches the electrode
any user with the incorrect code is not
able to unlock the computer
to conclude in this paper we present
Bodywire-HCI
which enhances touch by coupling
communication with it
the signal confinement property of
EQS-HBC is used to enable strictly
touch-based communication
this has been demonstrated using three
different applications
thank you