S14: Spectrum Analyzer for Audio Frequency Signals
Contents
Grading Criteria
- How well is Software & Hardware Design described?
- How well can this report be used to reproduce this project?
- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Spectrum Analyzer for Audio Frequency Signals
Abstract
Input audio signal will undergo Fast Fourier Transform (FFT) analysis thereby identifying various frequency components of the signal and displaying them through a LED strip in Bar graph display.
Objectives & Introduction
Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.
Team Members & Responsibilities
- Anand Dumbre
- (Role)
- Chinmay Vaidya
- (Role)
- Kevin Beadle
- (Role)
Schedule
Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.
| Week# | Date | Planned Task | Actual Task |
|---|---|---|---|
| 1 | 03/13/14 | Order & receive parts. | Ordered the parts.late by 1 week as parts were not available |
| 2 | 03/20/14 | Interface microphone/LED strip to SJ One board. | Obtained the parts. Started work on Microphone and LED. |
| 3 | 03/27/14 | Design band pass filter to reduce noise. | Done |
| 4 | 04/03/14 | Analyze audio signals with Matlab using FFT. | The waveforms were not coming out properly. FFT code was working alright |
| 5 | 04/10/14 | Write code to process audio signal on SJ One board. | FFT code working fine. |
| 6 | 04/17/14 | Write algorithm to output audio signal to LED strip. | ADC and FFT output coming out properly |
| 7 | 04/24/14 | Test algorithm using different audio sources. | Tested using various Youtube audio. Still working on porting of LED strip. |
| 8 | 05/01/14 | Finalize project firmware. | |
| 9 | 05/08/14 | Finalize project demonstration. | |
| 10 | 05/13/14 | Finalize project report. |
Parts List & Cost
Give a simple list of the cost of your project broken down by components. Do not write long stories here.
Design & Implementation
The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.
Hardware Design
Discuss your hardware design here. Show detailed schematics, and the interface here
Hardware Interface
In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.
Software Design
Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.
Implementation
This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.
Testing & Technical Challenges
Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.
Include sub-sections that list out a problem and solution, such as:
My Issue #1
The main issue was obtaining correct parts for the audio amplifier board and LED strip. The gain of amplifier needed to correct for required frequency. Also, the parts were not available on Websites. Resolution: checked the forums on the websites to obtain more information about the boards. Placed an order for deliver when available on the Adafruit and Sparkfun.
My Issue #2
We required the timer1 for ADC. However, the timer1 was configured for the I2C bus. Hence, we changed the I2C bus ports to timer2 and used the timer1 for ADC
My Issue #3
Adafruit Led strip had a library for Arduino. We need to port it to LPC in order to get our LED strip working.However, there are timing issues as the clock frequencies are not same for both. Issue is not resolved yet.
Conclusion
Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?
Project Video
Upload a video of your project and post the link here.
Project Source Code
Send me your zipped source code and I will upload this to SourceForge and link it for you.
References
Acknowledgement
Any acknowledgement that you may wish to provide can be included here.
References Used
List any references used in project.
Appendix
You can list the references you used.
