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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

Portable RF Multimedia Transmitter

Michael Bieniek, Mikhail Zakharov,

background
Background
  • Vast majority of consumer media content is stored digitally on computers.
  • Consumers would like to see their media content on a TV.
background1
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
purpose
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
advantage
Advantage
  • Minimize hardware costs
  • Scalability: point to multipoint
  • Utilize existing infrastructure
  • Ease of setup
design objectives
Design Objectives
  • Wirelessly broadcast audio and video.
  • Receive on a TV.
  • Tune to a UHF channel.
design objectives1
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/

rf modulator
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).
btsc stereo encoder
BTSC Stereo Encoder
  • Input: 2-channel analog audio.
  • Output: Stereo encoded audio.
  • Freescale MC44C402.
filter
Filter

Filter Response

Implementation

amplifiers
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

testing and results1
Testing and Results

Spectrum Analyzer Output

Parameters

commercialization proposal
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/

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