Safety enhancement features for 21 st century automobile
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Safety Enhancement Features for 21 st Century Automobile. Don VanderLaan Jeremy Konz Natalie Hannon Tom Aprik Sponsor: General Motors. Presentation Outline. Purpose Design Parameters Hardware Algorithms Proof of Concept. Purpose.

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Safety Enhancement Features for 21 st Century Automobile

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Safety enhancement features for 21 st century automobile

Safety Enhancement Features for 21st Century Automobile

Don VanderLaan

Jeremy Konz

Natalie Hannon

Tom Aprik

Sponsor: General Motors


Presentation outline

Presentation Outline

Purpose

Design Parameters

Hardware

Algorithms

Proof of Concept


Purpose

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

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

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

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


Safety enhancement features for 21 st century automobile

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 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

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

Proof of Concept ctd.

  • Tested with SNR of 0.27 and a Doppler shift of 10%

  • Convolved output still indicates siren present


Conclusion

Conclusion

  • Questions?

  • Next Steps


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