transition from analog to digital broadcasting
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
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.