This document summarizes a seminar presentation on silent sound technology for voice conversion. It introduces the technology as a way for those who have lost their voice to still communicate by phone by transmitting information without using vocal cords. It discusses two main methods - electromyography and image processing. Electromyography detects electrical signals from muscle movement and converts them to speech, while image processing uses ultrasound to view tongue movement. Some advantages are helping those who lost their voice and enabling silent calls. Disadvantages include unnatural speech and high cost. Future applications could include incorporating the sensors into phones for more natural use.

1. VISVESVARAYA TECHNOLOGICAL UNIVERSITY,
BELAGAVI-590018, KARNATAKA
Department of Electronics & Communication Engineering
2014-2015
A Seminar on
“ VOICE CONVERSION FOR SILENT SOUND TECHNOLOGY”
Under the Guidance of :
Prof.N K Honnagowdar M.E
Presented By:
Lohit B.Dalal
2HN11EC020

2. CONTENTS
1. INTRODUCTION
2. NEED FOR SILENT SOUND
3. METHODS
4. ADVANTAGES
5. DISADVANTAGES
6. APPLICATIONS
7. FUTURE PROSPECT
8. CONCLUSION
9. REFERENCES

3. INTRODUCTION
 Amazing solution for those who had lost their voice but wish to
speak over phone.
 It is a technology that helps you to transmit information without
using your vocal cords.
 Detects every lip movement and Internally converts the electrical
pulses into sounds signals and sends them neglecting all other
surrounding noise.
 Hence person on other end of phone receives the information in
audio.
 Developed at the Karlsruhe Institute of Technology, Germany
 Expected in the next 5 - 10 years. Once launched, will have a drastic
effect and with no doubt, will be widely used.

4. NEED FOR SILENT SOUND
 An end to embarrassed situations such as:
 Whenever we are talking on a cell phone in a crowd,then
actually we are “not talking, because of lots of disturbance
and noise around us.
 In the case of an urgent call in a meeting, apologetically
rushing out of the room in order to answer or call the person
back.

5. METHODS
 Two Methods for using Silent Sound Technology
1.Electromyography
2.Image Processing

6. ELECTROMYOGRAPHY (EMG)
 Technique for evaluating and recording the electrical
activity produced by skeletal muscles.
 Performed using an instrument called an
“Electromyograph”, to produce a record called an
“Electromyogram”.
 Electromyograph detects the electrical potential
generated by muscle cells when these cells are
electrically or neurologically activated.
 Monitored signals are converted into electrical
signals that can then be turned into speech.

7. EMG - PROCEDURE
 There are two types of EMG
1.surface EMG
 Four sensor are used they are vibration,
pressure, motion and electromagnetic
sensor.
2.Intramuscular EMG
 A Needle electrode or a needle containing
two fine - wire electrodes is inserted
through the skin into the muscle tissue.
 The insertional activity provides valuable
information about the state of the muscle
and its innervating nerve.

8. ELECTROMYOGRAPHY SIGNAL
GENERATION
Basic mechanism of Electromyography where the muscle activity is
analyzed by the Electromyograph to generate an Electromyogram

9. IMAGE PROCESSING(ULTRASOUND SSI)
 Another way to obtain direct information on the
vocal tract configuration is via imaging techniques.
 Ultrasound imagery is a non-invasive and clinically
safe procedure which makes possible the real-time
visualization
 An ultrasound transducer, placed beneath the chin,
can provide a partial view of the tongue surface.

10. Fig 1.Silent Sound Interface (SSI) using Image Processing
CONTD…
Ultrasound
probe
Camera
Speech
Silent/ laryngectomized speaker
Silent
Vocoder
Lip Reader

11. ADVANTAGES
Helping people who have lost their voice due to
illness or accident.
We can make silent calls even if we are standing
in crowded place.
Very useful for sharing confidential information
like secret PIN number on phone at public place.

12. DISADVANTAGES
It will be like always talking to robot.
This technology will be very costly for a common man.

13. APPLICATIONS
 Silent Sound Techniques is applied in Military for
communicating secret/confidential matters to others.
 This technology can be best utilized by astronauts &
dumb peoples.

14. FUTURE PROSPECT
 Without having electrodes & sensors hanging all around
the face, these electrodes & sensors will incorporated in
to cell phones.
 Features like lip reading based on image processing &
recognition these are incorporated in to cell phones
rather than using computers(Ultrasound SSI).

15. CONCLUSION
 Silent Sound Technology, one of the recent trends in
the field of information technology implements
“Talking Without Talking”.
 It will be one of the innovation and useful technology
and in mere future this technology will be use in our
day to day life.

16. REFERENCES
 Honey Brijwani et al Int. Journal of Engineering
Research and Applications ISSN : 2248-9622, Vol. 4,
Issue 4( Version 9), April 2014
 International Journal of Engineering Trends and
Technology (IJETT) – Volume 9 Number14 Mar 2014
 Shehjar Safayas , Kameshwar Sharma , Silent Sound
Technology- An End to Noisy Communication,
Speech Communication Vol. 1, Issue 9,November
2013
 Michael Wand & Tanja Schultz ,Voice conversion for
silent sound technology,(ICASSP) KIT Germany
2011

17. THANK YOU !!