Transcript intro comm10x - CommTech10TPS2013

WHAT DO WE MEAN BY “COMMUNICATION”?
Communication can be defined as the transmission of sound, written symbols
(written language), and images. Today's instantaneous communication is made
possible only because of the types of devices we use and the network systems
that are in place to carry this information
People to people
People to machine
Machine to people
Machine to machine
COMMUNICATION SYSTEMS
Messages are intended to:
 Inform – news papers, TV news casts
 Educate – texts, video, DVD’s, internet.
 Persuade - advertising
 Control – machines and tools such as Computer Numeric Control: A type of
programmable control system, directed by mathematical data, which uses
microcomputers to carry out various machining operations; such as a mill or lathe.
COMMUNICATION SYSTEMS
All communication systems include a message, a sender, a communication channel,
and a receiver.
A communication channel is the path over which a message must travel to get from
the sender to the receiver.
COMMUNICATION SYSTEMS
COMMUNICATION SYSTEMS
Like all systems, communication systems follow the universal systems model.
COMMUNICATION SYSTEMS
Inputs:
 People
 Information
 Materials
 Tools and machines
 Energy
 Capital
 Time
COMMUNICATION SYSTEMS
Processes
Outputs
 Positive Outputs – The desired result of the system.
 Negative Outputs – The unwanted results created by the
systems.
 Electromagnetic Radiation
 Telemarketing Calls
 Pollution - Old phones, computers, devices, etc.
Feedback
 Your response to communications
HISTORY OF COMMUNICATIONS:
Ancient, Classical and Dark Ages (500 000 B.C. - 900 A.D.)
Discovery of Fire (c. 500 000 B.C.)
Use of Art to Communicate (c. 100 000 B.C.)
The First Calendar (4241 B.C., Egyptians)
The Invention of the Wheel (3500 B.C., Mesopotamia)
The First Written Language (3200 B.C., Sumerian
MIDDLE AGES, RENAISSANCE AND THE
ENLIGHTENMENT (900 - 1800)
The Invention of Movable Type (1041, Pi Cheng)
The Invention of the Printing Press (1450, Johannes Gutenburg)
The Adding Machine (1642, Blaise Pascal)
The Development of Binary Notation (1679, Gottfried Wilheim Von Leibniz)
The Invention of the Steam Engine (1698 Thomas Savery)
The First Network of Communication Towers (1790, Claude Chappe)
THE INDUSTRIAL AGE (1800S)
The Invention of the Photograph (1826, Joseph Niepce)
The Development of the Electrical Generator (1831, Michael Faraday)
The Invention of the First Mechanical Computer (1837 Charles Babbage)
The Invention of the Telegraph (1837, Cooke and Wheatstone)
The Development of Morse Code (1843, Samuel Morse)
The Invention of the Telephone (1876, Alexander Graham Bell)
THE MODERN AGE (1900 - 1960)
The First Transatlantic Radio Message (1901, Marconi)
The Invention of the Television (1926, John Logie Baird)
The Invention of the Walkie-Talkie (1938, Al Gross)
The Development of the Electronic Computer ENIAC (1946, Mouchly, Presper, and
Eckert)
The Invention of the Transistor (1948, Bardeen, Brattain, and Shockley)
The Development of the Integrated Circuit (1959, Jack St. Clair Kilby)
THE INFORMATION AGE (1960 - PRESENT)
The Invention of the First Communications Satellite {Telestar} (1962, Bell Laboratories)
The Development of the Internet (1968, U.S. Army)
The Introduction of Fiber Optic Communications (1970, Robert Lauren, Donald Kreck, Peter Schultz)
The Invention of the Compact Disk (1970, James T. Russell)
The Invention of the Microprocessor (1971, Marcain Hoff)
HBO Invents Pay-TV Service for Cable (1972, Home Box Office)
The Design and Construction of the Personal Computer (1977, Steve Jobs, Steve Wozniak)
First Cellular Phone Communication Network Started in Japan (1979)
Sony Walkman Invented (1980)
The Mouse Becomes a Regular Part of Computers (1981)
First Cellular Phone Network Started in the United States (1983)
American Government Releases Control of the Internet and WWW is Born (1994)
Major U.S. Newspaper Dailies Create National On-line Newspaper Network (1995)
Sony Demonstrates Flat TV Set (1995)
Widespread Computer Glitch, Y2K, Expected with the New Millennium (1999)
Virtual Keyboard Invented (2001, Canesta and VKB)
COMMUNICATION SYSTEMS
Transmission Channels
 Copper Wire: Many older phones consist of
two thin insulated copper wires twisted
around each other.
 Coaxial Cable: Carry many more messages
all at once than twisted-pair wire. Consists of
an outer tube made of a material that
conducts electricity (usually copper). Inside
the tube is an insulated central conductor
(also copper). Several of these cables are
combined into one bundle.
COMMUNICATION SYSTEMS
Optical Fibers: thin fibers of pure glass that carry
signals in the form of pulses of light. Each optical
fiber is surrounded by a reflective cladding and
an outside protective coating. The light pulses are
converted to electronic signals.
COMMUNICATION SYSTEMS
Microwaves can be used to carry phone
conversations over long distances. Microwaves
are very short electromagnetic waves that travel
through the atmosphere and make
communication without connecting wires
possible.
In cell phones, sound waves are changed into
microwaves. They are transmitted using an
antenna (sent and received) and converted back
to sound waves.