THE BRAVE NEW WORLD OF MUSICAL ANALYTICS

THE BRAVE NEW WORLD OF MUSICAL ANALYTICSJon McGahee, Fletcher Prouty, and Jimmie Sanders

The AgendaInitial Concepts and PlanningThe SetupProgrammingHow It WorksMeasured Frequencies and Other DataLessons Learned Q & A

Objectives

GoalsMeasure Guitar Strings FrequencyAccurately and Automatically Tune Guitar String Applications: Electric and Acoustic GuitarsConcept Demonstration for Timpani, Violin, ect.

EquipmentLaptop with LabVIEW installationNational Instruments USB-6221 BNC Data Acquisition HardwareStepper MotorHigh Quality (For Arduino) Microphone Sound Detection Sensor ModuleDC Power SourceSound Frequency GeneratorProfessionally 3D Printed Tuning Peg Apparatus Ink PenThinking CapsElectric GuitarThe TAs

Procedure

Create Necessary Coupling with 3-D PrinterTest MotorGet microphone working with tone generatorCreate necessary filteringDesign VITesting

User Interaction

Select desired noteRepeatedly strum guitar string Motor turns tuning pegs until in tune*

THE VI- Stepper Motor Initialization

THE VI- Looping Mechanism

THE VI- Measuring Frequency

How Microphone Works

THE VI- Measuring Frequency

How Power Spectrum and PSD Works

Uncertainty of +/- 5 Hz

THE VI- Measuring Frequency

VI Continued

Demonstration

ResultsConsistent with tone generatorAverage measured frequencies of each stringHigh E: 296.4 HzB: 152.4 HzG: 182 HzD: 158 HzA: 187 HzLow E: 175 Hz Better when start over tunedMultiple Runs Needed

String Calibration

Expected Frequency: 329.6 Hz Measured Average: 296.4 Hz

Expected Frequency: 246.9 Hz Measured Average: 152.4 Hz

String Calibration

Expected Frequency: 196.0 Hz Measured Average: 182 Hz

Expected Frequency: 146.8 Hz Measured Average: 158 Hz

String Calibration

Expected Frequency: 110.0 HzMeasured Average: 187 Hz

Expected Frequency: 82.4 Hz Measured Average: 175 Hz

Room For Improvement?Amplify the GuitarStronger Motor Accurate MicFriendlier User Interface Funding and Other Monetary Investments