Transition From Analog to Digital Broadcasting Adam Knight EE Student University of Utah October 1, 2009.

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Presentation transcript:

Transition From Analog to Digital Broadcasting Adam Knight EE Student University of Utah October 1, 2009

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 References digital-radio, accessed 9/23/09. spectrum-auction, accessed 9/23/09. accessed 9/23/09. accessed 9/23/09.