computer & Science Technology

1. Submitted by:
Chandramaul Sen
3611605
(EE 4th year)

2. CONTENTS
 Introduction
 1st public appearance
 What is skin put?
 Mechanical phenomenon
 Requirement
 Prototype armband
 The design
 The processing
 Advantages and Disadvantages
 Conclusion

3. INTRODUCTION
 Screens are smaller, cameras are all over
world, touch screen is everywhere.
 Mobility , flexibility , responsiveness are
getting more demands.
 Microsoft puts forward a new flesh-control
input technology called
“SKINPUT”.

4. 1ST public appearance was at Microsoft’s
TechFest 2010

5. What is “Skinput”?
 Skinput is technology that uses the human
body for acoustic transmission.
 Its allows the skin to be used as input surface,
allows to interact with body in eye free
manner.
 Was devloped by Chris Harrison(Carnegie
Mello University),Microsoft Research.

6. Mechanical phenomenon :
 As the skin taps on the skin; acoustic
energies are formed.
 Two forms of the waves are formed:
1. Transverse.
2. Longitudinal.

7.  Sensors are activated by the waves moving
underneath it.
 Transverse waves formed moves outward
form the point of contact
 Transverse waves formed at soft part of the
skin is of higher amplitude than the bony part
of skin.

9. Cont…
 Some energy is transmitted inward, toward the
skeleton.
 These are longitudinal waves; excites the bane.
 This excitation vibrates soft tissues surrounding
the entire length of the bone, resulting in new
longitudinal waves that propagate outward to the
skin.
 The sensor is activated as these waves hits
underneath it.

11. Sensing :
 Instead of a single sensing element with a
flat response curve, an array of highly
tuned vibration sensors are used.
 Bio –acoustic sensor, its employed with
small, cantilevered piezo films.

12. Cont…….
 Cantilever is adjusted in the resonating
frequency.
 Adjustment done by adding weight.
 Irresponsive to singal parallel on the skin;
reduce the noise due other signal.

13. About the sensor design…
 Can be manufactured in a very small form factor,
rendering it suitable for inclusion in future mobile
devices.

14. Requirements :
 An acoustic detector to detect sound
vibrations.
 It uses a microchip-sized pico projector to
display menu.
 It needs bluetooth connection.

15. Prototype armband :

16. The design :
 The prototype features has two arrays of five
sensing elements, incorporated into an armband
form.
 Each sensor array is sensible to particular set of
frequencies:
1. Upper – low frequencies – fleshier.
2. Lower – high frequencies – denser bones.

17. The processing :
 Employ a mackie onyx(sound
with alternative black and white bands)
1200f audio interface to digitally capture data
form the ten sensors.
 Each channel is sampled at 5.5 khz.
 This is connected to conventional desktop
computer , where a thin client written in C
interfaced.

18. Advantages :
 Arm can be brought closer to face (or vise
versa ) to see the display close up.
 colour contrast can be adjusted by dimming
the light so that a better picture will be visible
if skin and the text are too similar in color
during daylight.

19. Disadvantages:
 Unknown person can not operate it.
 If user wants to operate it, armband is
required.
 Bluetooth is required for connection.

20. conclusion :
 The technology itself is intriguing , and have more
application other than always avaibility.
 Skinput is very intersting technology . But its fate will
ultimately depend on how committed Microsoft is to
making it a commercial reality and how soon.