28-11-2012, 01:31 PM
REDTACTON A SEMINAR REPORT
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ABSTRACT
RedTacton is a new innovative Human Area Networking
technology that turns the surface of the human body as a safe, high
speed network transmission path.
RedTacton takes a different technical approach. Instead of relying
on electromagnetic waves or light waves to carry data, RedTacton
uses weak electric fields on the surface of the body as a
transmission medium.
Using RedTacton, communication starts when terminals carried by
the user or embedded in devices are linked in various combinations
according to the user's natural, physical movements.
Communication is possible using any body surfaces, such as the
hands, fingers, arms, feet, face, legs or toes. RedTacton works
through shoes and clothing as well.
A transmission path is formed at the moment a part of the human
body comes in contact with a RedTacton transceiver, physically
separating ends the contact and thus ends communication.
A RedTacton transmitter couples with extremely weak electric
fields on the surface of the body. The weak electric fields pass
through the body to a RedTacton receiver, where the weak electric
fields affect the optical properties of an electro-optic crystal. The
extent to which the optical properties are changed is detected by
laser light which is then converted to an electrical signal by a
detector circuit.
INTRODUCTION
WHAT IS REDTACTON?
Human society is entering an era of omnipresent computing, when networks
are seamlessly interconnected and information is always accessible at our fingertips.
The practical implementation of omnipresent services requires three levels of
connectivity:
• Wide Area Networks (WAN), typically via the Internet, to remotely connect
all types of severs and terminals;
• Local Area Networks (LAN), typically via Ethernet or WiFi connectivity
among all the information and communication appliances in offices and
homes; and
• Human Area Networks (HAN) for connectivity to personal information, media
and communication appliances within the much smaller sphere of ordinary
daily activities-- the last one meter.
NTT's RedTacton is a break-through technology that, for the first time, enables
reliable high-speed HAN.
Human Area Networking (HAN) is a technology that safely turns the surface of the
human body into a data transmission path at speeds up to 10 Mbps between any two
points on the body.
HISTORY OF HAN
In the past, Bluetooth, infrared communications (IrDA), radio frequency ID
systems (RFID), and other technologies have been proposed to solve the "last
meter" connectivity problem. However, they each have various fundamental
technical limitations that constrain their usage, such as the precipitous fall-off in
transmission speed in multi-user environments producing network congestion.
• The concept of intra-body communication was first proposed by IBM in 1996.
• This communication mechanism was later evaluated and reported by several
research groups around the world.
OVERVIEW OF REDTACTON
• RedTacton is a new innovative Human Area Networking technology that
turns the surface of the human body as a safe, high speed network
transmission path.
• RedTacton takes a different technical approach. Instead of relying on
electromagnetic waves or light waves to carry data, RedTacton uses weak
electric fields on the surface of the body as a transmission medium.
• Using RedTacton, communication starts when terminals carried by the
user or embedded in devices are linked in various combinations according
to the user's natural, physical movements.
• Communication is possible using any body surfaces, such as the hands,
fingers, arms, feet, face, legs or toes. RedTacton works through shoes and
clothing as well.
• Technically, it is completely distinct from wireless and infrared. A
transmission path is formed at the moment a part of the human body
comes in contact with a RedTacton transceiver, physically separating ends
the contact and thus ends communication.
• A RedTacton transmitter couples with extremely weak electric fields on
the surface of the body. The weak electric fields pass through the body to a
RedTacton receiver, where the weak electric fields affect the optical
properties of an electro-optic crystal. The extent to which the optical
properties are changed is detected by laser light which is then converted to
an electrical signal by a detector circuit.
MECHANISM OF COMMUNICATION WITH REDTACTON
Data is received using a photonic electric field sensor that combines an
electro- optic crystal and a laser light to detect fluctuations in the minute electric field.
The naturally occurring electric field induced on the surface of the human body
dissipates into the earth. Therefore, this electric field is exceptionally faint and
unstable.
The photonic electric field sensor developed by NTT enables weak electric
fields to be measured by detecting changes in the optical properties of an electro-optic
crystal with a laser beam.
RED TACTON TRANSCEIVER
Figure below shows the block diagram of a RED TACTON transceiver. The
signal from the interface is sent to the data sense circuit and the transmitter circuit.
The data sense circuit senses the signal and if the data is present it sends control signal
to the transmitter which activates the transmitter circuit. The transmitter circuit varies
the electric field on the surface of our body. This change in the electric field is
detected by the electro-optic sensor. The output of the electro-optic sensor is given to
the detector circuit, which in turn given to the interface of the receiving RED
TACTON device.