Communication Systems Foundations of Engineering and Technology Based on Technology: Today & Tomorrow

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 Assignment 1: Have students pick one form of communication technology and develop a PowerPoint presentation to be presented to the class (See Communication Systems PowerPoint Project) Assignment 2: Fill in the Communications Systems vocabulary sheet as we go through this unit. Use the PowerPoint, textbook, and any other resources to complete the worksheet.

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

Communication Systems Assignment 3: Using an Excel spreadsheet, keep track of your use of electronic communication devices (see Personal Use of Communication Devices.xls) List the devices you use including but not limited to: Cell phones Computer with or without the internet Text messaging IPOD Video games Television Land phone Email Be sure to list items that you may not automatically think of: Purchasing an item by scanning a barcode or debit card. Washing hands in lavatory and water comes on with a sensor. Stopped at an intersection under camera surveillance. Electronic traffic signals or electronic communication devices in your car (signal lights, etc.) Tabulate your findings and create a pie chart on your daily use. Compare your usage with the rest of the class.

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 Assignment 4: Using an old set of walkie talkies, send a classmate a message using Morse Code.

Communication Systems The Telephone by Alexander Graham Bell Video: Inventoon

Communication Systems Video: Digital vs. Analog

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 (by permission)