Communication Systems
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COMMUNICATION SYSTEMS
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Transcript of Communication Systems
COMMUNICATIONSYSTEMS
COMMUNICATION SYSTEMS
History of Communications: 1450 Johannes Gutenberg builds the movable
printing press. 1826 Joseph Niepce of produces the wrold’s first
permanent photographic image. 1876-Alexander Graham Bell introduced
telephone. 1877 Thomas Edison patents the phonograph. 1891 Thomas Edison and William Dickson invent
the kinetoscope. 1895 Guglielmo Marconi develops the wireless
telegraph 1925 John Logie Baird transmits the first
television signal. 1954 The transister radio or tubeless radios
become available in the USA 1990 The world wide web is created in Europe.
It’s chief architect is Tim Berners-Lee.
COMMUNICATION SYSTEMS
Communication is the ability to send and receive messages.
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
CNC Milling Video An example of communications used to
control is traffic signals and sensors that are used to send messages to the traffic signals.
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
TELECOMMUNICATIONS
Telecommunications means communicating over a long distance.
COMMUNICATION SYSTEMS
The telegraph by Samuel Morse. Sent electronic signals using wires. Morse devised a language with a series
of long and short signals that represented letters and numbers.
Video: Telegraph Machine
COMMUNICATION SYSTEMS
Morse code
COMMUNICATION SYSTEMS
The Telephone by Alexander Graham Bell
Video: Inventoon
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.
COMMUNICATION SYSTEMS
Television Video: How Television Works
COMMUNICATION SYSTEMS
Satellite Communication Systems A communication satellite is a device
placed into orbit above earth to receive messages from one location and transmit them to another.
It reflects signals back to earth like a mirror.
SES Global Video
