Auto-Chromatic Instrument Tuner Erin Smith Advisor: Dr. James Irwin Date: November 20th, 2000.
Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.
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Transcript of Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.
![Page 1: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/1.jpg)
Auto-chromatic Musical Instrument Tuner
Craig Janus and Robert SchmanskiAdvisor: Dr. James Irwin
![Page 2: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/2.jpg)
Presentation Overview
• Terminology• Project Summary• Functional Description• Block Diagram• Software • Milestones & Critical Problems• Future Work• Progress Summary
![Page 3: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/3.jpg)
Terminology
• Pitch / Fundamental• Octave• Tuning error • Cents
![Page 4: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/4.jpg)
Project Summary
• Determine pitch of note played• Inputs- microphone, mode/power
switch, and pitch selector• Output- pitch indicator, analog and
digital tuning meters, and speaker• 8031 microcontroller
![Page 5: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/5.jpg)
Functional Description
• Inputs– Microphone– Power / mode
switch– Pitch selector
![Page 6: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/6.jpg)
Functional Description (cont.)
• Outputs– Pitch indicator– Analog tuning
indicator– Digital tuning
indicator– Speaker
![Page 7: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/7.jpg)
Functional Description (cont.)
• Operating modes
– Off– Auto tune– Manual tune– Audible
reference pitch
![Page 8: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/8.jpg)
Block Diagram
![Page 9: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/9.jpg)
• Overall Flowchart• Table Look-Up Subroutine
Software
Bitmap Image
Bitmap Image
![Page 10: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/10.jpg)
• Fundamental Determination– Typical Musical Waveform input:
Milestones and Critical Problems
![Page 11: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/11.jpg)
• Input Conditioning Hardware– Schematic:
Milestones and Critical Problems
![Page 12: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/12.jpg)
• Peak Detector Circuit– Schematic:
Milestones and Critical Problems
![Page 13: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/13.jpg)
• Peak Detector Circuit– Critical Problem - Switching Noise:
Milestones and Critical Problems
![Page 14: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/14.jpg)
• Peak Detector Circuit– Switching Noise Solution - LPF:
Milestones and Critical Problems
![Page 15: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/15.jpg)
• Peak Detector Circuit– Solution Results:
Milestones and Critical Problems
![Page 16: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/16.jpg)
• Complete Input Hardware– Response to Vocal Pitch:
Milestones and Critical Problems
![Page 17: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/17.jpg)
• Complete Input Hardware– New Problem:
Milestones and Critical Problems
![Page 18: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/18.jpg)
• Frequency Divider– 74294
• Programmable divide by 2^n• Minimum divide of 2^2
– Need 2^1 to tune zero octave
Milestones and Critical Problems
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• Manley Board Difficulties– External Interrupt– Port 1
• Priority on Stand-Alone Microcontroller Hardware and User Interface Hardware
Milestones and Critical Problems
![Page 20: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/20.jpg)
Milestones and Critical Problems
• User Interface– Component Selection
• 16 vs. 7 Segment LED displays• Zero Center Analog Meter
– Interface Simplification• Pitch and Octave Up/Down Buttons vs. Rotary
Switches– GAL for Address Decoding, Display Drive,
and Button Debouncing
![Page 21: Auto-chromatic Musical Instrument Tuner Craig Janus and Robert Schmanski Advisor: Dr. James Irwin.](https://reader033.fdocuments.us/reader033/viewer/2022051103/5a4d1b547f8b9ab0599a8b6f/html5/thumbnails/21.jpg)
Future Work
• Original Design– Automatic Octave Selection– Improve Accuracy– Other Modes (Manual Tune, Reference Pitch)
• New Ideas– Automatic Gain Control– Improve Resolution
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Progress Summary• Peak Detector• 2^n Frequency Divider• GAL Usage• Stand alone
microcontroller hardware• Student Research
Exposition
• Auto Tuning Mode– 9 octave range (1-9)– User selected octave
• Tuning Accuracy– 1 cent at A4=440 Hz– 5 cents at ends of table
range
Auto-chromatic Musical Instrument TunerCraig Janus and Bob Schmanski Advisor: Dr. James Irwin, Jr.