1 / 17

Friday, December 17 th , 2010

Comparing Handheld and Voice-Control Interfaces When Using Mobile Phones and Portable Music Players. Friday, December 17 th , 2010. Justin M. Owens Shane B. McLaughlin Jeremy Sudweeks. Introduction. Introduction Methodology Procedures Analysis Results Conclusions.

hei
Download Presentation

Friday, December 17 th , 2010

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Comparing Handheld and Voice-Control Interfaces When Using Mobile Phones and Portable Music Players Friday, December 17th, 2010 Justin M. Owens Shane B. McLaughlin Jeremy Sudweeks

  2. Introduction Introduction Methodology Procedures Analysis Results Conclusions • Background: Increasing number of electronic devices used in vehicles, requiring drivers take eyes off road. • Purpose: Determine whether a voice-control system offers driving performance advantages over manual control of mobile phones and music players. • Conducted on public, rural 65 mph roadway. • Tested 21 regular users of the voice-control system to avoid practice effects; younger (~20’s) and older (~40’s) age groups.

  3. SYNC Voice-Control System • System allows voice commands for dialing (“Call John Doe”) & MP3 track selection (“Play track Enter Sandman”), handsfree conversation Introduction Methodology Procedures Analysis Results Conclusions • Also implements text-to-speech text message reception and canned message sending*

  4. Experimental Design Introduction Methodology Procedures Analysis Results Conclusions Between Subjects Within Subjects Task (Baseline) Dial Contact Conversation Play Track Modality Handheld SYNC Age Younger Older

  5. Dependent Variables • Task Duration • First -> Last task-related movement • Task-Related Interior Glances • Number of Glances • Glance Duration • Steering Measures • Steering Variance • Max Steering Wheel Speed • Mental Demand • 1-7; Subscale of NASA TLX Introduction Methodology Procedures Analysis Results Conclusions

  6. Test Vehicle • 2010 Mercury Mariner with SYNC® • VTTI Instrumentation • Four cameras • Cabin audio • Accelerometers • Gyros • Forward radar • CAN connectivity for • Steering wheel angle • Speed • Brake on/off Introduction Methodology Procedures Analysis Results Conclusions

  7. Handheld Devices • Participants used personal mobile phone and portable music players for the handheld trials. • Phones: • 10 - Numeric physical keyboards • 7 - Touch screens • 4 - QWERTY keypads • Music Players: • 12 - Apple iPods with click-wheel • 4 - Touch screen (2 iPhones and 1 iPod Touch) • 5 - Other interfaces, including 1 Zune Introduction Methodology Procedures Analysis Results Conclusions

  8. Testing Procedures • 1.9 miles, 65 mph • Completed 6 laps • One task per leg, after participant reached comfortable speed • Two trials each • Handheld Dial • Handheld Play • Handheld Converse • Voice Dial • Voice Play • Voice Converse Introduction Methodology Procedures Analysis Results Conclusions Task Task

  9. Analysis Vehicle • Video analyzed by trained reductionists • Separate General Linear Models were conducted for all measures. • Post-hoc comparisons conducted using Tukey correction. Introduction Methodology Procedures Analysis Results Conclusions Video Reduction MATLAB MS SQL MS SQL

  10. Phone/MP3: Total Interior Glance Duration • Handheld Dial, Play had longer total eyes-interior duration than any other condition, including Baseline. Introduction Methodology Procedures Analysis Results Conclusions

  11. Phone/MP3: Steering Variance • Handheld Dial, Handheld Play higher steering variance than all conditions except each other. • Differences not found between Voice and Baseline. • Older drivers had more variance. Introduction Methodology Procedures Analysis Results Conclusions

  12. Results • Handheld dialing and music selection resulted in: • Longer time to complete tasks • More interior glances • Longer total glance duration • More steering variability • Faster (jerkier) steering corrections • All tasks had higher reported mental demand than baseline, but handheld tasks were rated the highest. • Voice control and conversation rarely differed from baseline measures. Introduction Methodology Procedures Analysis Results Conclusions

  13. Conclusions • Voice-control for placing calls and selecting tracks had less impact on driving than manual control. • No performance differences were found between voice and manual tasks during conversations. • In general, measures during conversation were not found to be different from baseline driving. • Older drivers had more difficulty during manual dialing and track selection. • All tasks had higher reported mental demand than baseline, but handheld dialing/music were highest Introduction Methodology Procedures Analysis Results Conclusions

  14. Acknowledgments & References • Thanks to Ford Motor Company for funding and test vehicle. • John Shutko, point of contact Owens, J.M., McLaughlin, S.B., & Sudweeks, J. (2010). On-Road comparison of driving performance measures when using handheld and voice-control interfaces for mobile phones and portable music players. SAE Int. J. Passeng. Cars – Mech. Syst. 3(1): 734-743. *Owens, J.M., McLaughlin, S.B., & Sudweeks, J. (In Press), Driver performance while text messaging using handheld and in-vehicle systems. Accid. Anal. Prev., doi:10.1016/j.aap.2010.11.019

  15. Questions?

  16. Summary: Comparison to Baseline p < 0.05

  17. Summary: Voice compared to Handheld p < 0.05

More Related