Noise Supression Techniques of a Wireless Signal in Ecg

NOISE SUPRESSION TECHNIQUES OF A WIRELESS SIGNAL IN ECG

Submitted by: Raggar Paggar Camm

Student Number: 13001070

Supervisor: Mr Cavric

Faculty of Engineering and Technology

Department of Electrical, Computer& Telecommunications Engineering

Project report For Final year presented to the Botswana International University

Of Science and Technology in partial fulfilment of the requirements of the degree of

Bachelor of Engineering

2018

ABSTRACT

Of recent, too much attention has been diverted to the use of wireless technology to monitor heart activities of heart disease patients. This technology gives the patients free of movement, more mobility and more satisfaction. Some of the developments used in this technology includes many parts of the monitoring system such as electrodes, data acquisition systems, signal analysing and heart monitors with built-in global positioning systems. This feature provides the ability to determine the location of a patient when a heart attack happens.

Some of this technology is integrated with smart phones. This include wireless communication, high speed processors, web accessibility, big screen size and other features.

This advantages have motivated engineers and researchers to develop smart phones to work as a heart monitor. In this paper the integration of filtering circuits has been applied to aid in acquiring clear ECG signals for proper diagnosing of heart disease patients. The main idea is to build a an ECG signal amplifier that will provide adequate gain to the low frequency ECG signals for analysis without causing any distortions to the signal.

ABBREVIATIONS

ECG……………………………… ELECTROCARDIGRAM

WHM……………………………... WIRELESS HEALTH MONITOR

CMRR……………………………..COMMON MODE REJECTION

RF…………………………………. RADIO FREQUANCY

PDA………………………………… PERSONAL DIGITAL ASSISTANT

TABLE OF CONTENTS

ABSTRACT 2

ABBREVIATIONS 3

TABLE OF CONTENTS 4

LIST OF FIGURES 6

ACKNOWLEDGEMENTS 7

CHAPTER 1: INTRODUCTION 8

1.1 MOTIVATION 8

1.2 OBJECTIVES AND SCOPE 8

1.3 ORGANISATION OF THE REPORT 8

CHAPTER 2: BACKGROUND 9

2.1 THEORY 9

2.2 LITERATURE REVIEW 10

2.2.1 GENERAL DESIGN OF THE WIRELESS HEART MONITOR 11

A. ELECTRODES 11

B. ANALOG CONDITIONING CIRCUIT 12

C. ADC AND PRE-PROCESSING 12

D. THE WIRELESS COMMUNICATION 13

E. PROCESSING UNIT 13

F. ECG SIGNAL ANALYZING 14

G. REMOTE ECG MONITORING 14

CHAPTER 3: METHODOLOGY 15

3.1 SOLUTION APPROACH 15

3.2 EQUIPMENT 16

3.3 CIRCUIT DESIGN 16

3.3.1 INPUT STAGE 16

A. INSTRUMENTATION AMPLIFIER (INA126P) 16

3.3.2 FILTERING STAGE 17

A. HIGH PASS FILTER 17

B. LOW PASS FILTER 17

3.3.3 GAIN STAGE 18

3.3.4 SCHEMATIC OF THE CIRCUIT 18

CHAPTER 4 RESULTS AND DISCUSSION 19

CHAPTER 5 CONCLUSION 20

CHAPTER 6 FUTURE WORKS 20

Bibliography 21

LIST OF FIGURES

Figure 1: Normal ECG signal

Figure 2: The dry electrode

Figure 3; Non-contact electrode

Figure 4: Wireless ECG PDA

Figure 5: General structure of PDAs and mobile phones in a telemedicine network

Figure 6: ECG amplifier schematic

Figure 7: Instrumentation Amplifier Transient Response

Figure 8: ECG amplifier

ACKNOWLEDGEMENTS

I would to thank my supervisor for all the help and the support he gave me throughout the term of the project. I am grateful for the suggestions and corrections he made towards my project. I also like appreciate the emotional and physical support I got from my fellow classmates who also helped me when I encountered problems in my project