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Portable RF Multimedia Transmitter

Portable RF Multimedia Transmitter. Michael Bieniek, Mikhail Zakharov, . Background. Vast majority of consumer media content is stored digitally on computers. Consumers would like to see their media content on a TV. Common existing methods. Background.

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Portable RF Multimedia Transmitter

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  1. Portable RF Multimedia Transmitter Michael Bieniek, Mikhail Zakharov,

  2. Background • Vast majority of consumer media content is stored digitally on computers. • Consumers would like to see their media content on a TV.

  3. Common existing methods

  4. Background • Every TV has a wireless tuner to receive broadcast TV • Not all channels occupied by stations • FCC regulation allows for licence-free low power broadcast within the UHF band

  5. Purpose • Investigate feasibility of building a low-power portable transmitter, operating within the UHF band. • Living room equivalent of FM transmitters for listening to music in the car

  6. Advantage • Minimize hardware costs • Scalability: point to multipoint • Utilize existing infrastructure • Ease of setup

  7. Design Objectives • Wirelessly broadcast audio and video. • Receive on a TV. • Tune to a UHF channel.

  8. Broadcast method

  9. Design Objectives • Support commonly used digital media storage formats (H.264, MPEG 2, MPEG 4, etc…). • USB for power and PC interfacing. • Portable form-factor ready. Reference: Dell Unveiled USB Digital TV Tuner [online], Available: http://www.mr-gizmo.com/tag/digital-tv-tuner/

  10. Design

  11. Design: User PC

  12. Prototype User Interface

  13. GStreamer: Video Pipeline

  14. Design: Digital Media Processor

  15. Digital Media Processor Prototype Platform: Beagleboard Ref: Beagleboard.org

  16. Design: RF Transmission

  17. RF Modulator • Input: NTSC video and BTSC audio. • Output: UHF modulated signal. • Freescale MC44BS373CA. • Capable of modulating on channels 14-69 (471.25 MHz – 801.25 MHz).

  18. BTSC Stereo Encoder • Input: 2-channel analog audio. • Output: Stereo encoded audio. • Freescale MC44C402.

  19. Filter Filter Response Implementation

  20. Amplifiers • Two stage amplifier boosts the power level of the RF modulated signal. • Total simulated gain of 44 dB • High IP3 points and unconditionally stable. Mini-Circuits RF Amplifier

  21. Prototype PCB

  22. Prototype Implementation

  23. Testing and Results

  24. Testing and Results Spectrum Analyzer Output Parameters

  25. Commercialization Proposal • Use digital modulation techniques (ATSC). • Improve output power. • Minimize size. • $38/unit. Reference: Dell Unveiled USB Digital TV Tuner [online], Available: http://www.mr-gizmo.com/tag/digital-tv-tuner/

  26. Questions?

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