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Digital Guitar Amplifier and Effects Unit Shaun Caraway, Matt Evens, and Jan Nevarez Group 5, Senior Design Spring 2014

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Digital Guitar Amplifier and Effects Unit Shaun Caraway, Matt Evens, and Jan Nevarez Group 5, Senior Design Spring 2014 Digital Guitar Amplifier and Effects Unit Shaun Caraway, Matt Evens, and Jan Nevarez Group 5, Senior Design Spring 2014 Table of Contents 1. Executive Summary ....................................................................................... 1 2. Project Description ......................................................................................... 2 2.1. Project Motivation and Goals ................................................................... 2 2.2. Objectives ................................................................................................ 3 2.3. Project Requirements and Specifications ................................................ 3 3. Research ........................................................................................................ 4 3.1. Digital Signal Processing ......................................................................... 4 3.1.1. Requirements ................................................................................... 4 3.1.1.1. Sampling Rate ............................................................................... 4 3.1.1.2. Audio Word Size ............................................................................ 5 3.1.2. Processor Comparison ..................................................................... 5 3.1.3. Features ............................................................................................ 6 3.1.3.1. Programming Method .................................................................... 6 3.1.3.2. Real-Time OS ................................................................................ 6 3.1.3.3. Ports Available ............................................................................... 7 3.2. Analog ..................................................................................................... 7 3.2.1. Input .................................................................................................. 7 3.2.2. Output ............................................................................................... 8 3.3. Data Converts ......................................................................................... 9 3.3.1. Analog to Digital Converts ................................................................ 9 3.3.2. Digital to Analog Converts .............................................................. 10 3.4. Communication ..................................................................................... 11 3.4.1. UART .............................................................................................. 11 3.4.2. SPI .................................................................................................. 11 3.4.3. UPP ................................................................................................ 12 3.4.4. EMIF16 ........................................................................................... 12 3.4.5. SRIO ............................................................................................... 12 3.4.6. McBSP ............................................................................................ 13 3.5. Algorithms ............................................................................................. 13 3.5.1. K Method ........................................................................................ 14 3.5.2. Newton’s Method ............................................................................ 15 3.5.3. DK Method ...................................................................................... 16 3.5.4. DK Method Equations ..................................................................... 16 i 3.5.5. Impedance Decomposition ............................................................. 17 3.5.6. Component Models ........................................................................ 18 3.5.7. Vacuum Tube Models ..................................................................... 18 3.5.8. Diode Model ................................................................................... 20 3.5.9. Transformer Model ......................................................................... 20 3.5.10. Effects Algorithms ....................................................................... 23 3.5.10.1. Delay ........................................................................................ 23 3.5.10.2. Reverb ..................................................................................... 24 3.5.10.3. Chorus ..................................................................................... 25 3.5.10.4. Compression ............................................................................ 26 3.5.10.5. Speaker Cabinet Simulation ..................................................... 27 3.6. Printed Circuit Board ............................................................................. 29 3.6.1. Layer Consideration ....................................................................... 29 3.6.2. OrCad ............................................................................................. 30 3.6.3. Eagle .............................................................................................. 30 3.6.4. Upverter .......................................................................................... 31 3.7. User Interface ........................................................................................ 31 3.7.1. On Board ........................................................................................ 31 3.7.1.1. On Board LCD ............................................................................. 31 3.7.1.2. Microcontroller for the LCD ......................................................... 32 3.7.1.3. Alternate Solution ........................................................................ 32 3.7.2. Computer ........................................................................................ 33 3.8. Power Supply ........................................................................................ 33 3.8.1. Linear Power Supply ...................................................................... 33 3.8.2. Switching Power Supply ................................................................. 34 3.8.3. Power Management ....................................................................... 35 4. Design ......................................................................................................... 37 4.1. Audio Inputs and Outputs ...................................................................... 37 4.1.1. Unbalanced to Balanced Signal ...................................................... 38 4.1.2. Headphone Output ......................................................................... 40 4.1.3. Stereo Output ................................................................................. 43 4.2. Data Convert Design ............................................................................. 44 4.2.1. Analog to Digital Converter ............................................................. 44 4.2.2. Digital to Analog Convert ................................................................ 48 4.2.3. Clocking .......................................................................................... 51 ii 4.3. Digital Signal Processor ........................................................................ 52 4.3.1. Clocking for Processor .................................................................... 52 4.3.2. Memory ........................................................................................... 55 4.3.3. Power On and Boot Sequence ....................................................... 56 4.3.4. Software .......................................................................................... 57 4.4. User Interface ........................................................................................ 59 4.4.1. Hardware Interface ......................................................................... 59 4.4.2. Software Interface ........................................................................... 61 4.4.2.1. Coding ......................................................................................... 62 4.4.2.2. Communication ............................................................................ 63 4.5. Printed Circuit Board Design ................................................................. 64 4.5.1. Printed Circuit Board Requirements ................................................ 65 4.5.2. Analog Board .................................................................................. 65 4.5.3. Digital Board ................................................................................... 65 4.5.3.1. Hardware configuration of the TMS320C6657 ............................. 66 4.5.3.2. Filtered Voltage Supplies ............................................................. 67 4.5.3.3. DDR3 Routing ............................................................................. 69 4.5.4. Bulk Power Supply Board ............................................................... 69 4.6. Power Supply Design ............................................................................ 70 4.6.1. Digital Sub System .......................................................................... 72 4.6.1.1. Power On and Off Sequencing .................................................... 75 4.6.2. User Interface Sub System ............................................................. 75 4.6.3.
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