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Adam Knight EE Student University of Utah October 1, 2009. Transition From Analog to Digital Broadcasting. Outline. Why go to digital? How it works Multi-casting with a multiplexer More on multiplexers Future research. Why Go Digital?. Improved quality of picture and sound
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Adam Knight EE Student University of Utah October 1, 2009 Transition From Analog to Digital Broadcasting
Outline • Why go to digital? • How it works • Multi-casting with a multiplexer • More on multiplexers • Future research
Why Go Digital? • Improved quality of picture and sound • Smaller Bandwidth Requirement • Consistency of signal • Companies want the extra analog bandwidth • Money • The U.S. Government made $20 billion auctioning off the 700 MHz band in Jan 2008
How it works • Analog data is transferred bit-by-bit • Digital data can be compressed • MPEG-2 • Reduces bit transmission by ratio of 55:1 • Only sends changes
How it works • Analog data is transferred bit-by-bit • Digital data can be compressed • MPEG-2 • Reduces bit transmission by ratio of 55:1 • Only sends changes
Multi-Casting with a Multiplexer • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder
Multi-Casting with a Multiplexer • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder • Sending multiple transmissions over the same line • Does so by using a multiplexer(mux) and decoder
More on Mulitplexers • Built with logic AND, OR and NOT gates • Chooses signal based on control gates and clock
Future Research • Compression Schemes • Multiple Broadcasts of HD Stations • Interactive Televisions • Cell Phone Transmission
Contact Information • Adam Knight • adam.knight@utah.edu • References • http://www.spectrum.ieee.org/consumer-electronics/standards/britain-mulls-over-digital-radio, accessed 9/23/09. • http://www.spectrum.ieee.org/telecom/wireless/taking-apart-the-700mhz-wireless-spectrum-auction, accessed 9/23/09. • http://www.pbs.org/opb/crashcourse/digital_v_analog, accessed 9/23/09. • http://en.wikipedia.org/wiki/Multiplexer#Digital_multiplexers, accessed 9/23/09.