Transcript Safety Enhancement Features for 21 Century Automobile

Safety Enhancement
st
Features for 21 Century
Automobile
Don VanderLaan
Jeremy Konz
Natalie Hannon
Tom Aprik
Sponsor: General Motors
Presentation Outline
Purpose
Design
Parameters
Hardware
Algorithms
Proof of Concept
Purpose

Increase automobile safety and driver
awareness with an “alerting system”
 Detect an emergency siren audio signal
 Turn down the volume of the car stereo
 Display an indicator symbol on the dashboard
Background
 Increase safety in conjunction with the
Emergency Vehicle Safety Initiative, a
partnership between the U.S. Fire
Administration (USFA) and the Society of
Automotive Engineers (SAE).
Design Objectives





Develop Matlab code for signal processing
Program microcontroller with signal
processing code
Interface components to build prototype
Test prototype for reliability
Package prototype for automobile
Hardware


Main processing is
done in dsPIC unit
dsPIC is combination
DSP/µC by Microchip
– Eliminates need for
separate DSP and µC


Specialized DSP
algorithm libraries
for convolution
Code written in C
Hardware ctd.
External
EEPROM is
needed to store
microphone waveform
data in combination with
original siren waveform
Specialized microphone
could be fitted, our
project will be generic
Radio speaker control
relay
LED, would be CAN
message to instrument
cluster in real car
Siren Detection Algorithm
Siren will be detected using a matched
filter
 Equivalent to convolution without the
time reversal
 Threshold the output to determine if the
siren is present
 Must be robust enough to work under
10% Doppler shift

Proof of Concept

Tested with a SNR
of 0.27 – far
below practical
conditions

Convolved output
clearly indicates a
siren present
Proof of Concept ctd.

Tested with SNR
of 0.27 and a
Doppler shift of
10%

Convolved output
still indicates siren
present
Conclusion


Questions?
Next Steps