ansha report

7/29/2019 Ansha Report

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ACKNOWLEDGEMENT

I would like to express my sincere gratitude and reverence to God Almighty, for guiding

me throughout this seminar, making my endeavor an undiluted success.

I extent my sincere gratitude to Prof.Shahir V K, Principal for giving me the arena and

providing me with all the amenities to do the seminar.

I also extend my heart full thanks to Assoc.Prof. Lekha Pankaj, Head of Department of

Electronics and Communication Engineering, for encouraging and aiding me throughout the

seminar.

I express our sincere gratitude to Mrs. Sythalakshmi C S, the Seminar Coordinator for

their valuable advice and help presenting the seminar

In course of completion of the seminar I was fortunate to receive the assistance of many

faculty, friends and relatives who were extremely generous with their valuable suggestions,

time and energy. I would like to thank all of them and recognize the fact that without them

this seminar would have been inconceivable.

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ABSTRACT

Stethoscopes are used to listen to acoustic signals from the internal organs of the

human body. Although stethoscopes play a very important role in the diagnosis process, the

chest piece and the connecting cable are known to facilitate transmission of pathogens from

patient to patient and from patient to the user. Replacing the connecting cable with a wireless

system may help reduce the potential risk and further allow broadcasting of the signals to

multi-users for examination. This work reports on the design of a two-piece Bluetooth-based

wireless system that eliminates the connecting cables in electronic stethoscopes. The design

consists of a Bluetooth based integrated chest-piece module for captured acoustic sound

transmission and a microcontroller-based (MSP430) head-piece receiver module for decodingthe data for the three operational modes of the stethoscope. The design was first tested using a

chirp signal source with frequency of 10 Hz 5 kHz. Results obtained for the three

operational frequency bands of the stethoscope were consistent with the expected behaviour

of the stethoscope.

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CONTENTS

Chapter Page No

1. INTRODUCTION 1

2. ELECTRONIC STETHOSCOPE TECHNOLOGY OVER VIEW 3

2.1 Chest Piece 3

2.2 Tubing. 4

2.3 Ear Piece 4

2.4 Electronic Stethoscope 5

2.5 Amplifying Stethoscope 6

2.6 Digitizing Stethoscopes 7

3. FUNCTIONS& FEATURES 83.1 Power 8

3.2 Volume Control & Amplification 9

3.3 Frequency 9

3.4 Ambient Noise Reduction 10

3.5 Stethoscope Software 10

3.6 Analog& Digital Conversion 12

3.7 Real Time 12

4. SYSTEM DESIGN DESCRIPTION 14

4.1 Design of Integrated Chest-Piece System 15

4.2 Wireless Transmission System 17

4.3 Design of Integrated Receiver Head-Piece System 17

4.4 Numerical Simulation and System Integration 22

5. RESULTS AND DISCUSSIONS 24

6. ADVANTAGES& DISADVANTAGES 26

6.1 Advantages 26

6.2 Disadvantages 26

7. APPLICATION 27

8. CONCLUSION 28

REFERENCE 29

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LIST OF FIGURES

Figures Page No

1.1 Complete System Of Wireless Digital Stethoscope 2

2.1 Electronics Stethoscope 6

4.1:Overview Of the Hardware Architecture of the Subsystems and interconnections 14

4.2: Diagram of the form factor of the proposed wireless Stethoscope 15

4.3: Microphone Bias And The Pre-Amplification Circuit 16

4.4 (a) Filter Magnitude Response For Bell Mode 18

4.4 (b) Filter Magnitude Response For Diaphragm Mode 19

4.4 (c) Filter Magnitude Response For The Extended Mode 19

4.5: Finite State Machine State Flow Model Of The Behavior of The Microcontroller 20

4.6: Receiver Headset Amplification Circuit 21

4.7: Simulink Model of the Wireless Stethoscope System 22

5.1(a) Unidirectional input chirp signal 24

5.2(b) Output response for different operational modes 24

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