1 / 22

Ear and head dimensions measurement and Experiment design of HRTF measurement

Ear and head dimensions measurement and Experiment design of HRTF measurement. Supervisor: Dr Richard So Speaker: Brian Ngan. Contents. Introduction Ear and Head dimensions of 1059 UG students Motivation Data collected Methodology of measurement Next step

kaipo
Download Presentation

Ear and head dimensions measurement and Experiment design of HRTF measurement

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. Ear and head dimensions measurementandExperiment design of HRTF measurement Supervisor: Dr Richard So Speaker: Brian Ngan

  2. Contents • Introduction • Ear and Head dimensions of 1059 UG students • Motivation • Data collected • Methodology of measurement • Next step • Experiment design of HRTF measurements • Motivation • Preparation of Manikin head • Preparation of external ear model • Design of experiment • Summary • Q & A

  3. Introduction • Sound Localization of human • Filtering effect of pinna, head and torso • Brain process those data and percept an auditory event • Head-related Transfer function (HRTF) • Frequency responses and time delay between sounds that originate from different positions and their corresponding destination of sounds measured between the ear canals and the pinnae

  4. Introduction • The shape of ear and head is highly correlated to Head-Related Transfer Function (HRTF) • Clustering people according to their ear and head dimensions

  5. Ear and Head dimensions of 1059 UG students

  6. Ear and Head measurements Motivation • Study the relationship between ear/head dimensions and sound localization performance • Cluster subjects and collect a set of HRTF from each cluster

  7. Ear and Head measurements Data collected • 1059 UG students • 610 males, 449 females • Head dimensions • Chin to top of head • Bitragion Breadth • Head Length

  8. Ear and Head measurements Data collected • Ear dimensions • d1 cavum concha height • d2 cymba concha height • d3 cavum concha width • d4 fossa height • d5 pinna height • d6 pinna width • d7 intertragal incisure width From V. R. Algazi et. al. (2001)

  9. Ear and Head measurements Methodology of measurement • Head measurement • Using anthropometer to measure

  10. Ear and Head measurements Methodology of measurement • Ear measurement • Using digital camera to take ear photos • Measure different dimensions with a program provided by Mr. Leung Wai Keen

  11. Ear and Head measurements Methodology of measurement The program that used for ear measurement

  12. Ear and Head measurements Next step…. • The progress: ear measurement • Cluster subjects according to their ear/head dimensions • Invite students from each cluster to be subjects of sound localization performance experiment • Check if the sound localization performance is different in different cluster

  13. Ear and Head measurements Next step…. • Collect 1 or 2 subjects’ ear models from each cluster • Measure sets of HRTF from those ear models • Verify those HRTFs if it gives a good sound localization performance for people belonged to that cluster

  14. Experiment design of HRTF measurements

  15. Experiment design of HRTF measurements Motivation • Investigate the effect of head size on HRTF • Investigate which type of material (wax or ABS) is more suitable for making HRTF-measurement-purpose manikin head • Investigate the differences of HRTF between human and manikin head with ear model

  16. Experiment design of HRTF measurements Preparation of Mannequin head • Dimensions: • 5%tile, 50%tile and 95%tile of head height, breath and length of male data collected in UST • Using rapid prototype machine to make the model • FDM – ABS (a kind of polymer) • ThermoJet – Wax

  17. Experiment design of HRTF measurements

  18. Experiment design of HRTF measurements Preparation of external ear model • Dr. Aaron Leung (certified prosthetist-orthotist) helped making external ear model • Ear models are made of silicon • 2 sets of external ear models were made now (Brian’s and Dr. So’s) Will invite 2 more subjects.

  19. Experiment design of HRTF measurements Design of experiment • Due to limitation of time, it may only possible to collect 20 set of HRTF • Material deciding : 1,2,3 • Head size effect: 1,7,8 • Individual difference: 1,4,5,6 *Numbers are the working sequence

  20. Experiment design of HRTF measurements Design of experiment • What I am expecting: • Wax head will give nearer values of real man HRTF than ABS • The head size does not affect too much on HRTF • The shape of external ear (pinna) contributes most part of HRTF • HRTF collected will give high sound localization performance to its owner

  21. Summary • We have collected 1059 students’ head dimensions and ear photos • We are going to • test which material is the best for HRTF measurement • Test the differences of HRTF collected with human and manikin head

  22. Q & A

More Related