Emergency Vehicle Detector for Use in Consumer’s Motor Vehicle Georgia Institute of Technology...
-
Upload
mark-oliver -
Category
Documents
-
view
224 -
download
0
Transcript of Emergency Vehicle Detector for Use in Consumer’s Motor Vehicle Georgia Institute of Technology...
Emergency Vehicle Detector for Use in Consumer’s Motor
Vehicle
Georgia Institute of TechnologySchool of Electrical and Computer EngineeringECE 4007
Ehren Bendler, Jose Crespo, Tyler Evans, Richard Yee
October 21, 2008
Project Overview
EMV Detector will warn motorist of approaching EMV
EMVs are involved in thousands of accidents per year that are preventable with proper warning
EMV Detector can be used by any motorist Total estimated cost of project is $51,406.25
including labor and equipment
Design Objectives
Capture audio from outside of vehicle Process signal to determine if EMV is
approaching Detect siren 5dB over ambient noise Refresh every 2 seconds or less Use audio and visual (LED) warnings Fit in dashboard of any vehicle
EMV Detector
Design Flow
Doppler Shift? Shut Off Radio
Output Warnings
Turn On Radio
Siren?
No
Yes
ApproachingMoving Away
Input Audio
Give All-Clear
Car Radio
Siren SoundsWail (725-1600 Hz, 12 CPM)
time (sec)
fre
qu
en
cy (
Hz)
0.5 1 1.5 2 2.5 3 3.5 4 4.5 50
500
1000
1500
2000Yelp (500-3000 Hz, 180 CPM)
time (sec)
fre
qu
en
cy (
Hz)
0.5 1 1.5 2 2.5 30
500
1000
1500
2000
2500
3000
Piercer (725-1600 Hz, 800 CPM)
time (sec)
fre
qu
en
cy (
Hz)
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.20
500
1000
1500
2000Hi-Lo (550-650 Hz, 60 CPM)
time (sec)
fre
qu
en
cy (
Hz)
0.5 1 1.5 2 2.5 3 3.5 4 4.5 50
200
400
600
800
1000
Detection Algorithm
Implement in MATLAB Perform FFT on audio input Look for presence of siren frequencies above
ambient noise level Use Doppler shift to determine direction
– Higher frequency means approaching– Lower frequency means moving away
System Diagram
Computer Specifications
Motherboard: Intel D945GCLF2– 4 USB 2.0 ports– Integrated VGA output– Realtek ALC662 HD Audio
Processor: Embedded Intel Atom 330– 2 cores at 1.60GHz
Memory: 2GB DDR2-667
LED Controller
Cypress CY8CLED04– USB Interface– Analog and Digital I/O– PSoC Architecture– 512 Registers
Design Analysis
Advantages– Client-side only
product– Software can be
modified to enhance product in the future
– Inexpensive
Disadvantages– Cannot determine
distance and location of EMVs
– Cannot distinguish between different EMV types
Demonstration Plan
Demonstrate project in a laboratory setting Use a SPL meter to determine the loudness
of microphone input Subject system to standard siren sounds at
varying levels of loudness to determine minimum functionality level
Subject system to Doppler shifted sirens and ambient road noise
Problems
Turning off stereo Delayed parts acquisition Distinguishing between different EMVs
Project Schedule
Finish hardware and software: 10/31 Write final project summary: 11/24 Prepare demo: 11/24 Write final project report and finalize website:
12/1
Current Status
Software correctly detects the wail type siren Hardware is assembled and Windows XP
operating system installed Algorithms are being developed to detect
other types of sirens