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Video Sync Generator

Video Sync Generator. 01/33. Video Sync Generator. ECE 345 design project: Spring 2000 Prof. Swenson T.A. : Jon Benson Group # 54: Cyrus K. Ashrafi ashrafi@uiuc.edu Mike barber m-barber@uiuc.edu Ryan Berube rberube@uiuc.edu. 02/33. The Video Sync: Objective. Suppressed Sync.

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Video Sync Generator

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  1. Video Sync Generator 01/33

  2. Video Sync Generator • ECE 345 design project: Spring 2000 • Prof. Swenson • T.A. : Jon Benson • Group # 54: • Cyrus K. Ashrafi • ashrafi@uiuc.edu • Mike barber • m-barber@uiuc.edu • Ryan Berube • rberube@uiuc.edu 02/33

  3. The Video Sync: Objective Suppressed Sync Recaptured Signal • Impress Sync on Signal 03/33

  4. The Video Sync: Objective • SSAVI Sync-Suppressed Signal 04/33

  5. The Video Sync: Objective • Blanking Level • Peak White Level • Synchronizing Level • Difference Between Black • and Blanking Levels • Peak-to-Peak Value of • Color Burst • Peak Level, Including • Chrominance Level • Line Blanking Interval • Interval Between Time • Datum and Backedge of Line- • Blanking Pulse • Front Porch • Synchronizing Pulse • Build-Up Time of the Line- • Blanking Pulse • Build-Up Time of the Line- • Synchronizing Pulse • Start of Sub-Carrier Burst • Duration of Sub-Carrier • Burst • Line Synchronizing Signal • (non-sync suppressed) 05/33

  6. The Video Sync: Objective • NTSC Video Sync 06/33

  7. The Video Sync: Circuit • Top Copper Layer 07/33

  8. The Video Sync: Circuit • Assembly Top 08/33

  9. The Video Sync: Circuit • Overall Circuit 09/33

  10. The Video Sync: Circuit • Power and Serial Communications 10/33

  11. The Video Sync: Circuit • Video Signal Processing 11/33

  12. The Video Sync: Circuit • Microprocessor Controller 12/33

  13. The Sync Generator:5V Power 13/33

  14. The Sync Generator:5V Power Ripple 14/33

  15. The Sync Generator:Analog Power 15/33

  16. The Sync Generator:DC-DC Converter 16/33

  17. The Sync Generator:Negative Power Supply 17/33

  18. The Sync Generator:Negative Regulator 18/33

  19. The Sync Generator:After Negative Regulator and Pi Filter 19/33

  20. The Sync Generator:Voltage Amplifier 20/33

  21. The Sync Generator:Voltage Inverter 21/33

  22. The Sync Generator:Inverting Circuit 22/33

  23. The Sync Generator:Inverted and Pulled Down 23/33

  24. The Sync Generator:Negative Voltage Summer 24/33

  25. The Sync Generator:TTL Sync Signals 25/33

  26. The Sync Generator:MUX Output 26/33

  27. The Sync Generator:Peak Detect 27/33

  28. The Sync Generator:Comparator 28/33

  29. The Sync Generator:Video Signal with Artificial Sync 29/33

  30. The Sync Generator:Video with Sync 30/33

  31. Problems • Video Signal Must Be Pure • VHS VCR’s Impose Their Own Automatic Gain Control (in order to make the varied voltage level of the signal equivalent) • Test Pattern is Needed (in order to check exactly how the signal is modified when it is encoded) • Video Oscilloscope • Good Sampling Rate and Frame Synchronization • Location of the Main Frame Sync • A Good Starting Point is Critical to the Functionality of the Descrambling Circuit 31/33

  32. Recommendations • Once the Main Frame Sync Point is Found • Replace the Microprocessor with CMOS Digital Logic Circuit (though less flexible, faster) 32/33

  33. Video Sync Generator 33/33

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