Usability of Digital Radio


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presentation of a research about usability of in vehicle digital radio

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Usability of Digital Radio

  1. 1. Searching Digital Audio Broadcasting radio stations:<br />Usability and safetyissues for in-vehicledevices<br />1<br />M.Dibitonto1, M.Camilli1.2, A.Vona1, R.Grimaldi1, F. Di Nocera1,2, C.M. Medaglia1<br />1 C.A.T.T.I.D. – Sapienza University of Rome<br />2 L.A.F.C. – Dept. of Psychology -Sapienza University of Rome<br />CHItaly 2011<br />
  2. 2. The Remediation<br />When digital technology is applied to an “old” and analogical media a lot of things changes:<br /><ul><li>Functionalities
  3. 3. Contents
  4. 4. User Interaction
  5. 5. Context(s) of Use
  6. 6. …</li></ul>2<br />CHItaly 2011<br />
  7. 7. What is DAB?<br />Digital Audio Broadcasting System is a digital technology for broadcasting radio station with an high quality of service.<br />DAB+ is the most recent evolution and adds new multimedia services.<br />3<br />CHItaly 2011<br />
  8. 8. Some data services<br />CHItaly 2011<br />4<br />DLS<br />EPG<br />SLS<br />iTxt<br />
  9. 9. DAB+ in Italy<br />Since 2008 test RAI* is leading experimental transmissions in Italy (Rome,Venice, Bologna) <br /><ul><li>Test capabilities
  10. 10. Test new type of contents/ format</li></ul>Contents and usability are key factors to make DAB appealing for a broad public<br />5<br />CHItaly 2011<br />
  11. 11. Our focus<br />In Italy 15mlns (42%) of users listens to analogue radio in their cars.*<br />In this context introduction of new interactive system may affect the driving performance.<br />Usability, User Experience and Safety <br />are key factors to correctly design DAB+ services for an in vehicle context.<br />*Menduni, 2003<br />6<br />CHItaly 2011<br />
  12. 12. How wewillsearch a station with DAB?<br />With DAB the number of radio stationswillincrease andsearchingcouldbecome a difficult task. <br />DAB+ can supportserching/browsing station with:<br />SL = station description<br />EL = name of the Ensemble<br />PT-1 = global genre of a station<br />PT-2 = sub-genre<br />Whichoneis the mosteffective, efficient and the best in terms of UX, usability and safety? <br />7<br />CHItaly 2011<br />
  13. 13. The prototype<br />3.5 inch - 480x320px <br />A prototypehasbeenimplemented to test differentsearchstrategies:<br />name– PT1 (genre) – PT2 (sub-genre)<br />8<br />CHItaly 2011<br />
  14. 14. Test environment<br />Driving simulator<br />Eyetracker<br />DAB prototype<br />Vibration feedback steeringwheel<br />Camera for video recording<br />The test environment to simulate an in-vehicle context .<br />9<br />CHItaly 2011<br />
  15. 15. CHItaly 2011<br />10<br />
  16. 16. 8 participants (2F – 6M, age 28.12, sd 3.18)<br />A pre-test questionnaire<br />A post-test questionnaire<br />Analisys of eyefixations<br />11<br />CHItaly 2011<br />
  17. 17. Results<br />Resultsshowed no significantdifference in task durationwhile the analysis of eye scanning pattern showedthatuserspendless time lookingat the receiverwhileusing the PT-2 station search.<br />12<br />CHItaly 2011<br />
  18. 18. Results<br />Usabilityquestionnairescoresshowed a that DAB radio wasperceivedasslightly more satisfyingthan FM<br />13<br />CHItaly 2011<br />
  19. 19. Conclusion and future works<br />DAB will deeply change radio and the way the people interact with it giving new opportunities and challenges<br />With DAB the number of radio station will increase and the user will face an higher complexity<br />Generally the results showed that categorization of the program could help user searching a station. It seems to be particularly useful in automotive domain where hands-free implications could be critical for user safety <br />The quali-quantitative approach used showed to be a suitable method to assess the usability of DAB technology<br />Future studies will be aimed at testing the reliability of these results with a larger sample of users<br />14<br />CHItaly 2011<br />
  20. 20. Thank you for your attention!<br />Questions and (hopefully) answers.<br />15<br />CHItaly 2011<br />