ABSTRACT

An intercom is a stand-alone voice communications system for use within a building or small collection of buildings, functioning independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles. Intercoms can incorporate connections to public address loudspeaker systems, walkie talkies, telephones.

Four-way intercommunication system is nothing but the communication within four persons not close to one another. This does not mean we should categorize telephones, fax, teleprinters, telegraphs etc. an example of intercom system since they are used in communication between people. However, intercom involves short distance places. It is limited in electronics, offices, and hospitals. This intercom system is a four-way station type. This means that a person can communicate to the other at another station at his own convenient time. They call once another attention by the use of the tone generated by the use of tone generator.

Depress a button and the tone sounds, and the same switch is thrown to the intercom circuit thus they communicate.

TABLE OF CONTENTS

COVER PAGE

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWELDGEMENT

ABSTRACT

CHAPTER ONE

INTRODUCTION

1.1     BACKGROUND OF THE PROJECT

1.2            OBJECTIVE OF THE PROJECT

1.3            PURPOSE OF THE PROJECT

1.4            SIGNIFICANCE OF THE PROJECT

1.5            PROBLEM AND LIMITATION OF THE PROJECT

1.6            SCOPE OF THE PROJECT

1.7            PROJECT ORGANISATION

CHAPTER TWO

LITERATURE REVIEW

2.1            HISTORICAL BACKGROUND OF THE PROJECT

2.2            REVIEW OF 4-WAY INTERCOM

CHAPTER THREE

SYSTEM DESIGN

3.1            DESCRIPTION OF THE SYSTEM BUILDING BLOCK

3.2            SYSTEM DESIGN SPECIFICATION

3.3            BLOCK DIAGRAM OF THE SYSTEM

3.4            DESCRIPTION OF THE OVERALL OPERATION OF THE SYSTEM

3.5            LIST AND DESCRIPTION OF THE SYSTEM COMPONENTS

3.6            COMPLETE CIRCUIT DIAGRAM

CHAPTER FOUR

4.1            IMPLEMENTATION, TESTING AND RESULTS

4.2            CONSTRUCTION PROCEDURE AND TESTING

4.3            INSTALLATION OF THE COMPLET DESIGN 

4.4            CASING AND PACKAGING

4.5            ASSEMBLING OF SECTIONS

4.6            TESTING OF SYSTEM OPERATION

4.7            PROBLEM ENCOUNTERED

CHAPTER FIVE

5.1            COST OF ANALYSIS

5.2             CONCLUSION

5.3             RECOMMENDATION

5.4            REFERENCES