1. Audio to MIDI Converter Team Obama Advisor: Dr. William Hunt Adnan Burkic Sean Earley Jon Kump Brian Tyson Georgia Institute of Technology 3/16/2010

2. Project Overview Audio to MIDI converter plug-in designed for guitar Guitar can control any MIDI device in real-time Software will be targeted toward guitarists and record producers Software solution requiring no hardware Software will be approximately $50, cheaper than competing hardware products

3. Important acronyms What is MIDI? o Musical Instrument Digital Interface o Industry standard for electronic music devices What is a VST Plug-in? o Virtual Studio Technology o Requires host application o Industry standard for music related plug-ins

4. Design Goals VST plug-in compatible with any third-party software Low latency to allow real time performance Fast and accurate pitch detection(monophonic) Pitch Bend

5. Design Illustration Interface mockup

6. Graphical User Interface

7. Design Challenges How to code a VST? How to detect pitch? How to output MIDI?

8. SynthMaker

9. AMDF Pitch Detection Average Magnitude Difference Function Time-Domain Fast and simple Not capable of accurate polyphonic pitch detection

10. AMDF Theory A4 (2/440) G4 (2/392) E4 (2/330) (Delay in Seconds) Input, Delayed Input Input+Delayed Input

11. MIDI Output MIDIEvent block Currently researching the structure of the MIDI protocol Final step of the project

12. Acceptance Testing Latency needs to be perceived as real time o Can be measured using host program o Needs to be less than 20ms Pitch detection accuracy o Ensure detected pitch matches played pitch for all notes on guitar

13. Scheduled Milestones Completed o VST audio input & MIDI output interface o Peak detection o Audio level normalization April 2nd - Pitch detection Completion April 16th - MIDI event generation May 6th - Final Presentation and Demonstration

14. Cost Analysis Product DescriptionQuantityUnit Price Price SynthMaker Standard License 1 $255 Estimated Labor 650 hrs $30$19,500 Misc. Cables/Hardware for Test Purposes 1 $125 Product Cost Total $19,880

15. Future Developments Pitch Bend Bass Guitar Alternate Tunings

16. Questions? Challenges VST Pitch Detetion MIDI Output