1. Dual-Use Wideband Microphone System
Sponsor: George Salazar, NASA
Faculty Advisor: Harold Stern

2. Team Members Matthew Swanzy Project Manager Fabrication and Testing
Victor Brewer
Software
Jordan Fedorchak
Expandability
Jason de Jongh Serial Communication
And user interface
Hunter Thompson
Expandability
“I’d like to introduce my team, again I am Matthew Swanzy, this is Victor Brewer, Jordan Fedorchak, Jason De Jongh and Hunter Thompson.”
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3. Topics
Overview
Design Approach
Results
Future Work
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4. Motivation The problem:
Need: A multi functional device that can provide immediate alerts of potential hazards in order to quickly evaluate and resolve a situation before it escalates.
No Dual-Use MEMS microphone system currently exists, only a handheld ultrasonic source detector.
Why is this important?
Testing the viability of using a MEMS microphone on board to serve multiple functions (e.g. speech processing and ultrasonic frequency detection) that will provide quick alert to hazards, along with an open communication system.
Why are you doing this project? What’s important / needed / beneficial about it?
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5. Stretch Goals of Project
Overview of Project
Goals of Project
Stretch Goals of Project
POC detection of ultrasonic frequencies
Distinguish between human voice and ultrasonic frequencies
Provide a communication channel
Beam forming array
Identify ultrasonic sources
Improved HCI
If no stretch goals then delete the text box on the right, and expand the one on the left.
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6. Roles & Responsibilities
NAME
ROLE
Matthew Swanzy, Project Manager
Definition, Design & Testing, Conduct meetings, Status reports
Victor Brewer
Software and Processing of Audio Streams
Jordan Fedorchak
Expandability, linear array spacing and number of microphones
Jason de Jongh
Matlab User Interface and Ultrasonic audio stream filtering
Hunter Thompson
Expandability, Human voice audio stream filtering
State WHO actually did WHAT.
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7. Our Sponsors
NASA has reached out to Texas State and provided us with an opportunity to conduct a POC that, if proven to work, could save the lives of our astronauts aboard the ISS.
They have consistently been available for consulting and guidance when needed.
Nasa has also provided us with several varying approaches and useful resources needed to complete this project.
Talk briefly to how the Sponsoring company is involved – part of their business / research / outreach? Why are they interested? Say what they did/provided for you. Be brief!!
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8. Budget Items Quantity Expenses Total: Funds remaining:
Extra Items
MEMS microphone 25
$58.00
Linear array PCB 1
$375.00
Arduino Due
$49.95
SMD capacitor
$25.00
Vaccum Pump
$40.00
PCBs
100
$149.93
Electric griddle
$20.59
solder tweezers
1 (set of 6)
$3.22
Solder flux pen
$7.99
Total:
$354.68
Total Funds:
$729.68
Funds remaining:
$145.32
Over Budget by:
$229.68
Compare planned vs. actual. Be brief!
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9. Design Approach
The approach we took to this project was to start by utilizing as much already available materials as possible.
Matlab toolbox’s
NI Elvis II prototyping board
We designed the MEMS microphone PCB’s by hand to learn about the design process.
Courses we found useful on our project include Digital Signal Processing, Circuits I&II and Analog and mixed signal design.
These courses gave us a good background for the different components of our project.
Draw from Section 5.2 of Final Report.
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10. Constraints Unable to test upper bound of MEMs microphone.
Unable to produce an in-audible ultrasonic “air leak” for testing. Still produces noise in the audible range.
Unable to make compact design.
Board change from Arduino to the Elvis
Use an active filter
Use a clock not produced by Elvis board
This is from Section 6 of the Final Report. Be brief!
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11. Design Decisions Swap Arduino Due for NI Elvis II
Due serial communication too slow
Matlab
Graphical user interface
Data acquisition
Digital signal processing
MEMS Microphone
Size
80 kHz maximum frequency
Draw from Section 5.1 of Final Report.
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12. Single mic. PCB
Clock Jump
Ground Jump
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13. 5 Mic. linear array
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14. Block Diagram
Victor my want to take out the ultrasonic Sonification from our block diagram as we may not be able to include in our final piece.
System level diagram of Dual-Use Wideband Microphone array. Blocks highlighted in yellow will be designed and coded for this project.
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15. GUI The GUI provides three separate signal plots:
Voice activity detection
Ultrasonic detection
Vocal waveform display
Embedded within the GUI is
Start/Stop/ Running status
Sonification
Mute alarm
Hazard detection display
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16. GUI
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17. Results Voice identified Detects ultrasonic up to 40 kHz
Irregular sounds mis-identified
Detects ultrasonic up to 40 kHz
Detects 40 kHz at a distance of 180 in. away from the source
Sonification of Ultrasonic source
Use results + compliance statement from the Characterization Report. Table is OK. Add a slide for margin or fail if need be. USE GRAPHICS and PICTURES! Be visual!! Add slides if need be!!
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18. Distance test 20 kHz source
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19. Distance test 40 kHz source
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20. GUI – Hazard detected
Pull from your Characterization Report what would be required to meet all specs.
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21. Future Work Better voice activity algorithm
G.729 Annex B over-identifies
Array expansion
Tracking
Better leak simulation
Pull from your Characterization Report what would be required to meet all specs.
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22. Thank You
We would like to thank our sponsors, George Salazar, Andy Romero and David Juge at NASA
We would also like to thank our technical mentors Dr. Stern, Dr. Viswanathan and Dr. Compeau
Thank you to everyone for attending our Senior Design presentation!!!
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