Remote operated audio video switcher
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Audio/Video Switcher - PowerPoint PPT Presentation

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Remote Operated Audio/Video Switcher. Team Members. Jordan Goulder, Leader Joe Laszczak Kian-Wah Chee Dr. Harden, Advisor. Problems With Current A/V Devices. Low Cost Switchers Little crosstalk prevention Manually switched High-End Receivers High cost Large size. Solution.

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Team members l.jpg
Team Members

  • Jordan Goulder, Leader

  • Joe Laszczak

  • Kian-Wah Chee

  • Dr. Harden, Advisor

Problems with current a v devices l.jpg
Problems With Current A/V Devices

  • Low Cost Switchers

    • Little crosstalk prevention

    • Manually switched

  • High-End Receivers

    • High cost

    • Large size

Solution l.jpg

  • Remote Controlled With Current Remote

  • Quality Output

  • Relatively Small

  • Reasonable Price

Objectives design l.jpg
Objectives - Design

  • IR FrequenciesRC5 and RECS 80

  • Signal Loss<10 dB at 10 MHz

  • Min. Input Voltage.667 mV (40 dB)

  • Input Frequency20 Hz to 890 MHz

  • Crosstalk56 dB at 10MHz

Objectives real world l.jpg
Objectives - Real World

  • Device Size3in x 4in x 1in

  • Cost $60

  • Learning AbilityUser Programmable Remote Button

  • Reliability1 error per 1000 switches

  • FCC ComplianceFCC Code Part 15

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Recent Redesign Issues

  • Added Functionality

    a. Option to assign random input assignments

    b. Increment or Decrement

  • Decrease Device Size

User interface l.jpg

Infrared Receiver

Status LED’s

Learn/Reset Button

Input Selector Buttons

Remote Switcher

User Interface

Internal design l.jpg







4:1 Audio/Video Multiplexer


RI 1-4




Internal Design

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Major Design Issues

  • Correctly identifying RECS 80 and RC 5 infrared data transmission schemes

  • Effectively implement the functionality of the switching device through the controller

  • Minimize interference while maintaining small device dimensions

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Controller Functionality



Wait for Input


Program Button1



Read IR


Program Button2


Valid IR

Program Button3

Evaluate IR

Program Button4


Program Button++

Output <= Input1

Output <= Input2

Output <= Input3

Output <= Input4

Output <= Input++

Output <= Input--

Program Button--

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End of Semester Achievements

  • Successful programming of functionality

  • Successful infrared detection and decoding

  • Successful interaction of controller with RF components

Design problems l.jpg
Design Problems

  • Undesired RF penetration through multiplexer

  • Breadboard capacitance severely increase crosstalk potential

  • Undesired loss at low RF frequencies

Design solutions l.jpg
Design Solutions

  • Change the switching method from 4 input mulitplexer to independent path feeding

  • Use PCB to eliminate board capacitance

  • Use high speed low noise op-amps to amplify low frequency broadcast channels

References l.jpg


[1] Eugene R. Bartlett, Cable Television Technology and Operations HDTV and NTSC Systems, McGraw Hill Publishing Company, New York, New York, USA, 1990.

[2] Wagner Lipnharski, “Infrared”,, UST Research Inc., Orlando, Florida, November 1999.

[3] Gabriel Ricardo, Michael Vandegriend, Scott Medynski, “Infrared Codes for ConsumerAudio/VideoElectronics”,, University of Alberta, Alberta, Ontario, Canada, November 1999.

[4] Crutchfield Home Theater Catalog, “Crutchfield Home Theater Catalog”,, Charlottesville, Virginia, September 2002.

[5] Federal Communications Commission, “Part 15- Radio Frequency Devices”,, Washington, DC, 2001

[6] Rheinfelder, William A, CATV System Engineering Third Edition, Tab Books, Blue Ridge Summit, PA, USA, 1970.