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Improving Broadcast Coverage With DRM

Improving Broadcast Coverage With DRM. Charlie Jacobson and John Wineman HCJB Global Technology Center 5/8/2008. Advantages Coverage 100 to 300 Miles. Disadvantages:. NVI Tropical Band Shortwave. Advantages Coverage 100 to 300 Miles. Other Considerations: Frequency schedule required

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Improving Broadcast Coverage With DRM

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  1. Diversity DRM Receiver Project Introduction

  2. Improving Broadcast Coverage With DRM Charlie Jacobson and John Wineman HCJB Global Technology Center 5/8/2008 Diversity DRM Receiver Project Introduction

  3. Advantages Coverage 100 to 300 Miles Disadvantages: NVI Tropical Band Shortwave Diversity DRM Receiver Project Introduction

  4. Advantages Coverage 100 to 300 Miles Other Considerations: Frequency schedule required Audio Quality Transmitter, Receivers and antennas are: More expensive Less available More complex NVI Tropical Band Shortwave Diversity DRM Receiver Project Introduction

  5. Advantages Coverage 100 to 300 Miles Other Considerations: Frequency schedule required Audio Quality Transmitter, Receivers and antennas are: More expensive Less available More complex NVI DRMTropical Band Shortwave Diversity DRM Receiver Project Introduction

  6. Advantages Coverage 100 to 300 Miles Audio Quality Other Considerations: Frequency schedule required Transmitter, Receivers and antennas are: More expensive Less available More complex NVI DRMTropical Band Shortwave Diversity DRM Receiver Project Introduction

  7. Advantages Audio Quality Transmitters, Receivers and Antennas are: Less expensive More available Less complex Easier to maintain Other considerations: Typical coverage 35 Miles Requires a network of FM stations for greater coverage FM Diversity DRM Receiver Project Introduction

  8. Advantages Audio Quality Receivers are: Less expensive More available Less complex Easier to maintain Larger audience Programming can include local languages and events Other considerations: Requires more transmitters for the same coverage as Tropical Band Shortwave The broadcast network is More expensive More complex Harder to maintain FM Network Diversity DRM Receiver Project Introduction

  9. Studio FM Network interconnections • Required for networks with a master studio • Sends program audio to remote transmitters Diversity DRM Receiver Project Introduction

  10. Studio FM Network Interconnections:Tape Distribution • Simplest (Snail mail, motorcycle, foot) • Precludes real time program content • Minimal capital investment • May be be more expensive in the long term Diversity DRM Receiver Project Introduction

  11. Studio FM Network Interconnections:FM Relay • Requires stations every 30 miles or closer • Only as good as the weakest link in the chain • Requires a more complex license Diversity DRM Receiver Project Introduction

  12. Studio FM Network Interconnections:Other methods • Phone lines • Internet • Point to multipoint link (studio/transmitter link) • Satellite • DRM Diversity DRM Receiver Project Introduction

  13. Advantages 100 to 300 mile coverage Works over the horizon Works in mountains Clear audio Program is received on: Fm Shortwave Larger Audience Other considerations: Increased network complexity Additional equipment required HF transmitter near the studio DRM Receiver at each remote FM transmitter Shortwave propagation vs. frequency still an issue Studio FM Network Interconnections:Using DRM FM Diversity DRM Receiver Project Introduction

  14. Advantages 100 to 300 mile coverage Works over the horizon Works in mountains Clear audio Program received on: Fm Shortwave Frequency 1 Shortwave Frequency 2 Larger Audience Higher reliability Other considerations: Increased network complexity Additional equipment required HF transmitter near the studio Diversity DRM Receiver at each remote FM transmitter A Second HF transmitter near the studio Studio FM Network Interconnections:Using a Diversity DRM Receiver FM SW Freq. 1 SW Freq. 2 Diversity DRM Receiver Project Introduction

  15. Diversity DRM Receiver Project Team • Project partners: • HCJB Global Technology Center’s International Broadcast Team – Elkhart IN • Letourneau University – Longview TX • Rockwell Collins – Cedar Rapids, IA Diversity DRM Receiver Project Introduction

  16. Refined DRM receiver requirements & specifications Developed specifications for the DDC modules (Preselector, VGA, ADC and FPGA) Developed the module interface requirements & specifications Developed test plans for each DDC Module ‘07-’08 Achievements: Diversity DRM Receiver Project Introduction

  17. Designed hardware for the DDC modules Conducted Design Review and periodic status review meetings Built Prototypes of each DDC module Tested DDC modules Documented final design, project results & lessons learned ‘07-’08 Achievements: Diversity DRM Receiver Project Introduction

  18. Finalize and publish DRM receiver demodulator requirement specifications Publish design documentation for each component Integrate the existing hardware components Investigate, design, and begin implementation of digital demodulator Research hardware and software diversity techniques ‘08-’09 Objectives: Diversity DRM Receiver Project Introduction

  19. Questions? Diversity DRM Receiver Project Diversity DRM Receiver Project Introduction

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