1/23/08 diversity drm receiver project introduction1

1/23/081/23/08 Diversity DRM Receiver Project IntroduDiversity DRM Receiver Project Introductionction

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1/23/081/23/08 22Diversity DRM Receiver Project IntroduDiversity DRM Receiver Project Introductionction

Improving Broadcast Improving Broadcast Coverage With DRMCoverage With DRM

Charlie Jacobson and John WinemanCharlie Jacobson and John Wineman

HCJB Global Technology CenterHCJB Global Technology Center

5/8/20085/8/2008


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NVI Tropical Band ShortwaveNVI Tropical Band Shortwave

• Advantages– Coverage 100 to 300 Miles

• Disadvantages:


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NVI Tropical Band ShortwaveNVI Tropical Band Shortwave

• Advantages– Coverage 100 to 300 Miles

• Other Considerations:– Frequency schedule required– Audio Quality– Transmitter, Receivers and

antennas are:• More expensive

• Less available

• More complex


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NVI NVI DRMDRM Tropical Band ShortwaveTropical Band Shortwave• Advantages

– Coverage 100 to 300 Miles

• Other Considerations:– Frequency schedule required– Audio Quality– Transmitter, Receivers and

antennas are:• More expensive

• Less available

• More complex


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NVI NVI DRMDRM Tropical Band ShortwaveTropical Band Shortwave• Advantages

– Coverage 100 to 300 Miles– Audio QualityAudio Quality

• Other Considerations:– Frequency schedule required

– Transmitter, Receivers and antennas are:

• More expensive

• Less available

• More complex


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FMFM

• 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


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FM Network FM Network

• 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


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FM Network interconnectionsFM Network interconnections

• Required for networks with a master studio

• Sends program audio to remote transmitters

Studio


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FM Network Interconnections:FM Network Interconnections:Tape DistributionTape Distribution

• Simplest (Snail mail, motorcycle, foot)

• Precludes real time program content

• Minimal capital investment

• May be be more expensive in the long term

Studio


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• Requires stations every 30 miles or closer

• Only as good as the weakest link in the chain

• Requires a more complex license

Studio

FM Network Interconnections:FM Network Interconnections:FM RelayFM Relay


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FM Network Interconnections:FM Network Interconnections:Other methodsOther methods

• Phone lines• Internet • Point to multipoint link (studio/transmitter link)• Satellite• DRM

Studio


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• 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:FM Network Interconnections:Using DRMUsing DRM

FM


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• 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:FM Network Interconnections:Using a Using a DiversityDiversity DRM Receiver DRM Receiver

SW Freq. 1

SW Freq. 2

FM


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Diversity DRM Receiver Project TeamDiversity 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


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– 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:


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– 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:


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– 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:


2020

Questions?

Diversity DRM Receiver ProjectDiversity DRM Receiver Project

1/23/08 diversity drm receiver project introduction1

Documents

complex slide

fm relay slide

network of fm stations

broadcast coverage

drm charlie jacobson

broadcast network

miles audio quality

fm shortwave larger