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Project 16 Digital Whammy Bar

Project 16 Digital Whammy Bar. Tim Kamman | Jason Freeck | Parker Brown. 4/7/2014. Agenda. Introduction and Objectives PCB Design Evaluation Board Implementation Software design Sensors Requirements and Verification Conclusion. Introduction. Aftermarket tremolo bar Expensive

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Project 16 Digital Whammy Bar

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  1. Project 16Digital Whammy Bar Tim Kamman| Jason Freeck | Parker Brown 4/7/2014

  2. Agenda • Introduction and Objectives • PCB Design • Evaluation Board Implementation • Software design • Sensors • Requirements and Verification • Conclusion

  3. Introduction • Aftermarket tremolo bar • Expensive • Permanent • Difficult to tune • Limited shift possible • Solution: electronic implementation • Compact • Removable • Inexpensive

  4. Objectives • High quality tremolo bar effect using DSP • Available at lower cost than existing options • Non-intrusive and temporary installation • Limited user setup required

  5. Block Diagram

  6. PCB Design • Started with a single board design • ECE shop limitations → two board design • Power Board • Processing Board

  7. Voltage Regulator

  8. LM317 Voltage Regulator

  9. Power Simulations • Simulated voltage regulator to determine power consumption • 92.08 mW

  10. Power Budget • Typical 9 V Battery: 5.1 Wh

  11. DSP Chip • Analog Devices ADAU1701: • Audio Processor • ADC/DAC built in • Sampling rates up to 192KHz supported • GPIOs

  12. USB to I2C Interface

  13. Output Filter

  14. Verifying Output Filter

  15. Output Filter Tolerance Analysis • Ensure cutoff frequencies stay above the desired sampling frequency • Maximum 5% change in component values

  16. PCB Design: Cost Total: $93.72

  17. PCB Design: Difficulties • Complex design • Bulky • Two boards • Limited by board layers/planes • Difficulty soldering • Burnt board

  18. Evaluation Board Implementation Cost of Evaluation Board: $219.38

  19. Software Flowchart

  20. SigmaStudio • Proprietary software for Analog Devices DSP chips • Uses graphical blocks to program effects • Frequency shift included

  21. Code Walkthrough Scale down input signal from sensor Set sensitivity mode

  22. IR Sensor • Soldered IR sensor to 5 V power input • Bypassed current limiting diode

  23. IR Sensor: Issues • “Cut-In” at middle of shift range • Accidental triggering during play • Digital artifacts from IR sampling

  24. Potentiometer Sensor • Output Range: 0 to 3.3 V • Powered using external battery • Physical sensor • Better emulation of the feel of tremolo bar • More granular control • Purely analog, no sampling effects

  25. Requirements and Verification

  26. Requirements and Verification Original Shifted -30 dB

  27. Requirements and Verification

  28. Requirements and Verification Low Setting: Shifted to 387 Hz High Setting: Shifted to 287 Hz

  29. Requirements & Verification

  30. Future Work • Provisional patent application • Mounting system • PCB board implementation • Lower cost • Power potentiometer off of the board • Physical tremolo bar

  31. Conclusion • No digital tremolo bar available • Only alternative: aftermarket installation • Permanent • Invasive • Expensive • Digital tremolo bar can solve these problems • Low-Cost • Less Intrusive • Removable

  32. Questions?

  33. Appendix: PCB Board Layout

  34. Appendix: Phase Vocoder

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