Transition From Analog to Digital Broadcasting

Adam KnightEE Student

University of UtahOctober 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

adam.knight@utah.eduReferences

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.