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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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Remote Operated Audio/Video Switcher

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Remote operated audio video switcher l.jpg

Remote Operated Audio/Video Switcher


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

Solution

  • 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


Recent redesign issues l.jpg

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

1

2

3

4

X

Controller

4:1 Audio/Video Multiplexer

4

RI 1-4

L/R

Infrared

Signal

Internal Design


Major design issues l.jpg

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


Controller functionality l.jpg

Controller Functionality

Start

Program

Wait for Input

Program

Program Button1

Program

IR

Read IR

Buttons…

Program Button2

Buttons…

Valid IR

Program Button3

Evaluate IR

Program Button4

Buttons…

Program Button++

Output <= Input1

Output <= Input2

Output <= Input3

Output <= Input4

Output <= Input++

Output <= Input--

Program Button--


Ir demodulator output l.jpg

IR Demodulator - Output


Ir demodulator output13 l.jpg

IR Demodulator - Output


Crosstalk measured results and comparisons l.jpg

Crosstalk- Measured Results and Comparisons


Loss broadcast frequencies l.jpg

Loss – Broadcast Frequencies


Software testing l.jpg

Software Testing


Power consumption l.jpg

Power Consumption


Cost of major components l.jpg

Cost of Major Components


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End of Semester Achievements

  • Successful programming of functionality

  • Successful infrared detection and decoding

  • Successful interaction of controller with RF components


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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


Prototype l.jpg

Prototype


References l.jpg

References

References:

[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”, http://www.ustr.net/infrared/infrared1.shtml, UST Research Inc., Orlando, Florida, November 1999.

[3] Gabriel Ricardo, Michael Vandegriend, Scott Medynski, “Infrared Codes for ConsumerAudio/VideoElectronics”,

http://www.ee.ualberta.ca/~elliott/ee552/studentAppNotes/1999f/IR_codes/, University of Alberta, Alberta, Ontario, Canada, November 1999.

[4] Crutchfield Home Theater Catalog, “Crutchfield Home Theater Catalog”, http://www.crutchfield.com/cgi-bin/S-a6A7XN37AYP/ProdGroup.asp?c=4&g=10420&s=0, Charlottesville, Virginia, September 2002.

[5] Federal Communications Commission, “Part 15- Radio Frequency Devices”, http://www.access.gpo.gov/nara/cfr/waisidx_01/47cfr15_01.html, Washington, DC, 2001

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


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