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THE DESIGN, CONSTRUCTION AND TEST ON A TWO STATION SIMPLE INTERCOM SYSTEM

Format: MS WORD  |  Chapter: 1-5  |  Pages: 81  |  2867 Users found this project useful  |  Price NGN5,000

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THE DESIGN, CONSTRUCTION AND TEST ON A TWO STATION SIMPLE INTERCOM SYSTEM

 

CHAPTER ONE

INTRODUCTION

BACKGROUND OF THE STUDY

Human to human communication is an essential part of our every day activities. Advances in communication technology have enabled any-time-anywhere connection between people. There are a wide variety of devices to communicate with family, friends and workgroup members who are distributed geographically. Cellular phones are used at the working places, stores etc. to call home to be reminded of what is needed or when one will be late to  work, meeting etc. The purpose of a communication system is to transfer information between two or more points.  In general, a communications system  requires three things namely;  a transmitter, a  propagation  medium, and a  receiver. The information  to   be  transferred   may  be   in  analog   form (example, voice or audio) as in the case of this study where voice   is  the   source   of  information,   or   in   digital   form (computer   data,   digitalized   voice,   and    so   on).   The transmitter must have some means of superimposing this information   onto   its   output   signal    (modulation).   The modulated    transmitter    signal    must    pass    through    a propagation medium to a receiver. The propagation medium may be free space, an RF transmission line, or a fiber optic cable. The function of the receiver is to select (filter) the desired signal, amplify and extract the information. A simplified block diagram of a typical communication system is shown on figure 1. 0 below.

Interest arises in promoting communication within a building which is difficult and stressful going from one point to another within the building in the name of delivering information. In a domestic setting, family members will be collocated within the same building, but often will be unable to be heard using a normal speaking voice. Many households utilize intercom systems to facilitate conversations between remote parts of the home, but these systems have their drawbacks. They require one or both parties to go to specific parts of the house or hold onto a handset in order to communicate. They also offer little ability to direct communication to a person, within the house when the location of the person is initially unknown.

An intercom system is therefore a private telecommunication system that allows typically two or more locations to communicate with each other like telephone does. An intercommunication system may be a simple two- station system or a multi - station system. Many productions which need co-operation of more than a few people need special intercoms that cover many users. Intercom systems used in TV and stage productions are usually headsets type intercoms connected to one line using party line arrangement. The   primary  use  of this  type  of system   is   in   lives  or  media productions where (for example) the video director speaks to the camera operators, or where the stage manager speaks to the stage hands  and   lighting   operator,   etc.   A  simple  two  station  wired intercom system can be used as an intercom and door phone.  One can use an intercom system from the house to house gate to screen visitors to the house.

In this project work, discussions will base on design and implementation of a two station intercom system that will result in the instrumentation of a home to facilitate flexible one and two-way audio conversations. The intercom circuit will consist of two intercom stations linked to each other with a push - to - talk (PTT) switch. This kind of circuit, generally consist of only one or two amplifiers and generally uses loudspeakers as normal speaker and microphones (how it is used depends on talk switch position). Depending on the circuit design, there could be one PTT switch on one end, or separate PTTs on both stations (as in this case).

1.2     Statement of the problem

In a business organization, shops, stores, homes etc, many people find it difficult and stressful in relating/ delivering information between each other within a particular building. The servant finds it laborious going to the boss always whenever he / she has information to deliver or wants to carry out action(s) with respect to the master's authority. Parents within a home are even forced to walk down to the child's room whenever need arises. As a matter of fact, reaction to information is delayed. Therefore, this project work is to address this issue, looking forward to eliminating the stressful manpower involved and to facilitate information delivery, making communication easier.

1.3     Significance of the study

The aim and objective of this project is to design and construct a simple intercom system (mainly two communication stations) as a means to replace man's labour and stress of walking over a given premises for information delivery. These station wired intercom system can be used as a door phone, connecting from the house to the door to screen visitors to your house. The wife, after preparing dinner, can through this system call on the husband in his bedroom to the dinner table. Generally, intercom system can be used for message broadcast (in case of multi- channel intercom), as door phone, monitoring etc.

1.4     Scope of the study

The scope of this project work is limited to the design, construction and test on a two station simple intercom system with specification that;

i  The   demodulator   should   operate   with a   minimum distortion while producing an adequate output

ii. The small signal amplifier must provide an undistorted signal into the buffer amplifier to be able to drive a speaker of 8Q. Impedance.

iii. A 9 volt d.c power supply is to be design and employed to power the simple intercom for operation.-, at each station.

iv.  The mater and the remote stations will be built individually.

v. Result'  shall fully be discussed while suggestions for further study made.

1.5     Definition of some terms

In this study of simple intercom system, we shall come across terms and some of these are listed below with their meaning(s)-

DESIGN: Refers to

i   A goal directed problem solving activity.

ii  Relating product with situation to give satisfaction.

iii The imaginative jump from the present facts to future possibilities,

iv  he conditioning factor for those parts of the product which come into contact with people. 

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