Sponsor George Salazar NASA Faculty Advisor Harold Stern Team Members Matthew Swanzy Project Manager Fabrication and Testing Victor Brewer Software Jordan Fedorchak Expandability Jason de Jongh Serial Communication ID: 539526
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Dual-Use Wideband Microphone System
Sponsor: George Salazar, NASAFaculty Advisor: Harold SternSlide2
Team Members
Matthew SwanzyProject ManagerFabrication and TestingVictor Brewer
Software
Jordan Fedorchak
Expandability
Jason de Jongh Serial Communication
And user interface
Hunter Thompson
Expandability
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Topics
OverviewDesign ApproachResultsFuture Work
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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.
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Overview of Project
Goals of ProjectPOC detection of ultrasonic frequencies
Distinguish between human voice and ultrasonic frequenciesProvide a communication channel
Stretch Goals of Project
Beam forming array
Identify ultrasonic sources
Improved HCI
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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
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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.
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Budget
Items
Quantity
Expenses
Extra Items
Quantity
Expenses
MEMS microphone
25
$58.00
Linear array PCB
1
$375.00
Arduino Due
1
$49.95
SMD capacitor
25
$25.00
Vaccum Pump
1
$40.00
PCBs100$149.93 Electric griddle1$20.59 solder tweezers1 (set of 6)$3.22 Solder flux pen1$7.99 Total: $354.68 Total Funds: $729.68Funds remaining: $145.32 Over Budget by: $229.68
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Design Approach
The approach we took to this project was to start by utilizing as much already available materials as possible. Matlab toolbox’sNI 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.
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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 filterUse a clock not produced by Elvis board
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Design Decisions
Swap Arduino Due for NI Elvis IIDue serial communication too slowMatlabGraphical user interface
Data acquisitionDigital signal processing
MEMS Microphone
Size
80 kHz maximum frequency
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Single mic. PCB
Clock Jump
Ground Jump
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5 Mic. linear array
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Block Diagram
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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GUI
The GUI provides three separate signal plots: Voice activity detectionUltrasonic detectionVocal waveform display
Embedded within the GUI isStart/Stop/ Running status
Sonification
Mute alarm
Hazard detection display
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GUI
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Results
Voice identifiedIrregular sounds mis-identifiedDetects ultrasonic up to 40 kHz Detects 40 kHz at a distance of 180 in. away from the source
Sonification of Ultrasonic source
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Distance test 20 kHz source
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Distance test 40 kHz source
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GUI – Hazard detected
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Future Work
Better voice activity algorithmG.729 Annex B over-identifiesArray expansionTracking
Better leak simulation
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Thank You
We would like to thank our sponsors, George Salazar, Andy Romero and David Juge at NASAWe 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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