Wireless Stereo Audio Communicator for Television Use Dec0202 12/10/2002 Team Members: Advisors/Clients: Matthew Hamilton Dr. John Lamont Eric Hagen Prof.

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Presentation transcript:

Wireless Stereo Audio Communicator for Television Use Dec /10/2002 Team Members: Advisors/Clients: Matthew Hamilton Dr. John Lamont Eric Hagen Prof. Ralph Patterson III Michael Swan Cory Van Wyngarden Brian Young

Presentation Outline Problem Statement Design Objectives End-Project Description Assumptions and Limitations Project Risks and Concerns Technical Approach Evaluation of Project Success Recommendations for Further Work Human and Financial Budget Lessons Learned Closing Summary

Problem Statement General Background: Users desiring privacy Hearing impaired Technical Problem: Transmission of audio data up to 25 feet Near line-of-sight reception Portable receiver Transmission of voice quality audio

Design Objectives Functionality: Private listening of stereo television audio Analog FM transmission of audio using IR AC power at transmitter AC power and rechargeable batteries at receiver Tone control and balance capability Two sets of headphones and multiple receivers Volume can be individually adjusted

Design Objectives Design Constraints: Transmission of audio up to 25 feet Receiver must be portable and easy to use Operating environment limited to indoor applications Minimal power consumption to improve battery life Low cost

Design Objectives Intended Users: Individuals desiring private audio Hearing impaired Intended Uses: Nursing home or hospital Dorm room Spouses in bedroom Broadcast situations

End-Product Description Wireless stereo audio through analog infrared transmission Lightweight and portable receiver External power supply Rechargeable battery in receiver Receiver with user controls Output via standard 3.5mm stereo jacks Input from television’s RCA output

Assumptions and Limitations Assumptions: Television has RCA analog outputs User(s) will be viewing television while listening All needed parts and test equipment available Pricing by volume decreases overall cost estimate Minimal interference from other devices Limitations: Lack of experience with wireless technology Real-time audio/video signal Limited time for development

Project Risks and Concerns Project specifications change Essential parts are unavailable or delayed Design has a terminal or serious fault Hardware is damaged or defective Loss of a group member

Technical Approach IR vs. RF Digital vs. analog transmission Alkaline vs. Nickel cadmium batteries DSB-SC modulation vs. two channel transmission

Technical Design

Evaluation of Project Success Milestones: Project goals and target markets defined (fully met) Technology identified and selected (fully met) Product design (fully met) Product implemented (partially met) Testing and revision (partially met)

Recommendation for Further Work More compact design: DSB-SC modulation (FM stereo) Single transmitter and single receiver boards Improve functionality: Multiplexed stereo signal Digital transmission

Human Budgets Final Team Effort

Financial Budget Final Expenses

Lessons Learned Clearly defined project specs motivated team members Team members communicated well Part requests must be submitted early Practiced job related time management skills Utilized technical experts and other resources Expanded skills in analog circuit design and debugging

Closing Summary Wireless IR communication system For listening to television without disturbing others May be used by hearing impaired

Questions/Comments?

Appendix A Receiver

Appendix B Transmitter Tone Control Battery Recharging Circuit

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