1.1.2 Product Evolution April 17th, 2012.

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Presentation transcript:

1.1.2 Product Evolution April 17th, 2012

TELEPHONE April 17th, 2012

Telegraph Inventor: Samuel B. Morse (1837) Transmits messages over long distance Messages received are audible signals Earlier telegraphs experiments in Germany used bubbles in a glass of water April 17th, 2012

Morse Code Language made up of dots and dashes in a pattern to represents letters and numbers Receiver hears short audible signals for dots and long audible signals for dashes April 17th, 2012

Telephone Inventor: Alexander Graham Bell (1870s) Microphone converts sound waves into electrical signals Earphone converts electrical waves into sound waves April 17th, 2012

Landlines Plain Old Telephone Service (Post Office Telephone System) - POTS 2-twisted wire path of bi-directional, full duplex, voiceband avoids electromagnetic interference & cross talk Frequency: 300 to 3400 Hz Subscriber Loop 40 volts DC and 300 ohms From central office to subscribers home Analog lines carries control and audio signals April 17th, 2012

Landline Telephones Hand Cranked Magneto Generator Candlestick Direct connection to an operator that will connect the call Candlestick Direct connection to an operator that will connect the call Constantly powered April 17th, 2012

Rotary Dial Telephone Rotary movement’s sends electrical pulses – length represents a number Pulse dialing – sounds like a series of clicks April 17th, 2012

DTMF Telephone Dual-Tone Multi-Frequency Touch Tone dialing over analog lines An established tone’s frequency with distinct sine waves represents a number or symbol (* or #) April 17th, 2012

Analog Signals & Digital Signals Large signal fluctuations any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity Digital Signals Small signal fluctuations each point in time, the value of the signal must be above or below some discrete threshold Not subject to electronic noise April 17th, 2012

Cordless Telephone Uses and RF (radio frequency signal) Handset communicates with base station Handset contains rechargeable batteries April 17th, 2012

Cellular RF digital signals Sites are spaced apart in hexagonal pattern with 120 degree directional antennas CDMA (Code Division Multiple Access): encoding signals Alcalet-Lucent’s Lightradio, size of Rubix Cube, has same technology and power as a large cell tower April 17th, 2012

Cellular Telephone Transmits and receives signals over a radio link Connects to cellular network and public telephone network April 17th, 2012

Satellite Telephone Geosynchronous Satellites (4 at 22,000 miles) Fixed orbital position Transmits and receives RF digital signals April 17th, 2012

Mobile Computing (Smartphone) A.K.A Personal Digital Assistant (PDA) Contains a Mobile Operating System iOS Android (Linux) Windows Blackberry April 17th, 2012

TELEPHONE FUTURE Video: Apple's iPhone Concept Video: Sixth Sense Technology April 17th, 2012

References "Telephone - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 24 May 2012. <http://en.wikipedia.org/wiki/Telephone>.