1-Introduction

1-Introduction - PRINCIPLES OF COMMUNICATIONS...

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PRINCIPLES OF COMMUNICATIONS 1-INTRODUCTION 6/22/2010 Hilmer Medrano
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INTRODUCTION The one thing that has distinguished humans from other animals is their ability to exchange ideas and other information. That is humans can communicate. It is this capability that has played perhaps the biggest part in the development of civilization . As our civilization continues to grow, so must our communications capacity. The first electronic communication was accomplished through the use of wires and telegraphy. Messages were sent by turning electrical currents on and off in accordance with a telegraph code. 6/22/2010 Hilmer Medrano
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telephone system where electrical currents are varied at an audio rate. However, telephone system still required wires, which limited its capabilities Thus the next development was to be wireless communications in the form of radio. This greatly extended the communications range and, for the first time, included ships at sea and remote areas of the world. It allowed instantaneous and virtually
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1-Introduction - PRINCIPLES OF COMMUNICATIONS...

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