1. ECE 477 DESIGN REVIEW TEAM 14  SPRING 2010

2. Outline Project overview Project-specific success criteria
Block diagram
Component selection rationale
Packaging design
Schematic and theory of operation
PCB layout
Software design/development status
Project completion timeline
Questions / discussion

3. Project Overview Target Audience: Amateur Musicians
Obtain a “Guitar Tab” format of music
Viewable Tabs on LCD and export via SD Card
SD Card contains .txt file to be viewed/shared/printed
Preview tabs on LCD Screen

4. Project-Specific Success Criteria
An ability to capture sound from a guitar and perform an FFT on the samples
An ability to convert an arbitrary set of samples into a set of guitar notes
An ability to export tabbed guitar music to a removable digital media text file.
An ability to interact with the user via LCD Screen and Pushbuttons
Allow exportation of recorded song as MIDI OR An ability to interactively guide guitar tuning

5. Block Diagram

6. Component Selection Rationale
μC: SHARC 21262
DSP with FFT Capabilities
Interface w/ peripherals
Cost
ADC: TLV2541 
12 Bit resolution
Sufficient Sample Rate
SPI
SHARC:
Selected based on its FFT Capabilities, Ability to interface with all needed peripherals and low cost.
- There was also a dev board already available which was nice for our team financially
TLV 2541
Basic requirements- we only need to sample at 9k samples per second, this chip provides up to 200K samples per second
-12 bit resolution gives us over 4000 different values to analyze
SPI Interface and Low Pin Count

7. Component Selection Rationale
Filter: MAX7404
Low Pass
Adjustable Freq. Corner
LCD: CFAG24064A-FTI-TZ
8 Rows
Large display (7” x 2.56”)
RAM: CY7C1069AV33
10 ns Parallel interface
2 MB SRAM
Filter:
Low Pass since we are only interested in Guitar notes (Highest Frequency note is 1500 hz)
Filter will remove some the harmonics
This filter features an adjustable cutoff that is adjustable between 1 to 10 khz. (Change via external Clock Signal)
LCD:
Needed at least 6 rows for guitar tab display.
This model gives 8 rows so we can include status information and navigational commands as well
The display was also sufficiently large that the tabs could be viewed without being too cramped. It wouldn’t be very helpful if you could only see 4 notes at a time.
RAM: (holds both frequencies and Amplitudes)
10 ns Parallel interface provides enough speed to dump samples and store amplitudes
SRAM- Don’t need to refresh, can store and not worry about the data
2 Mbyte, enough storage to hold a song SPS x 12 Bits per sample = 108,000 bits / sec
108,000 bits/sec * 60 sec * 3 min = 25,920,000 (25Mbit) [Storing samples only allows 2 minute songs…
Storing the FFT data allows appoximately 10 times as much storage.

8. Packaging Design
Want all circuitry hidden and protected from liberal arts majors. Sturdy
Major design consideration was the size of the LCD Screen. Needs to be large so that the tab music previews can be viewed and actually have the data shown make sense.
4 Buttons (Software Debounced – Navigate and use menu’s and scroll side to side while using the tab preview
Contextual Menu’s- Want someone who to be able and pick up and use the device without needing to read the documentation.

9. Schematic/Theory of Operation

10. Schematic/Theory of Operation
Audio Input Signal is a

11. Schematic/Theory of Operation

12. Schematic/Theory of Operation

13. PCB Layout
duplicate this slide as necessary for each major block of your design

14. Software Design/Development Status
Accomplished so far:
Sound analysis proof of concept (MATLAB)
Preliminary work with LCD and SD Card
Left for Completion:
Port Sound Analysis to μC
Interface with Peripherals
Implement Pushbutton controls and menus
RAM, FLASH, ADC, LCD, SD Card

15. Project Completion Timeline
WEEK #: END DATE GOALS FOR END OF WEEK
WEEK 9: MARCH 12th Final PCB and Schematic, Proof of Parts
WEEK 10: MARCH 19th Matlab Note Analysis Complete, Homeworks Revised
WEEK 11: MARCH 26th Software Design Narrative
WEEK 12: APRIL 2nd Patent Liability, Packaging Prototype Complete
WEEK 13: APRIL 9th Reliability and Safety, Peripherals Working
WEEK 14: APRIL 16th Ethical and Safety Analysis, Finish Note Analysis on Micro
WEEK 15: APRIL 23rd User Manual, Live Testing
WEEK 16: APRIL 30th Software and Hardware Working, Poster Complete
WEEK 17: MAY 3rd Final Report
Timeline for Completion;
Besides keeping up with homeworks we have some goals set to help us catch up.
Homeworks will be revised and note analysis working in MATLAB by the end of week 10 (Spring Break)
A prototype of the packaging will be completed by the end of week 12 to ensure everything fits correctly
All of our peripherals, LCD, SD Card etc working individually by week 13
Note analysis on the micro working roughly by week 14
Week 15 we want to test with an actual guitar and debug

16. QUESTIONS / DISCUSSION