1. Directivity of human talkers National Research Council Canada Conseil national de recherches Canada Conseil national de recherches Canada Canada W.T. Chu, A.C.C. Warnock and J-C. Guy Indoor Environment Program, Acoustics Institute for Research in Construction Institute for Research in Construction National Research Council Ottawa, Ontario W.T. Chu, A.C.C. Warnock and J-C. Guy Indoor Environment Program, Acoustics Institute for Research in Construction Institute for Research in Construction National Research Council Ottawa, Ontario

2. ASA December 2001 Background Project funded in part by Public Works and Government Services of Canada Project funded in part by Public Works and Government Services of Canada Re-assessment of open-offices including team-style offices Re-assessment of open-offices including team-style offices

3. ASA December 2001 Project: Team style open offices Orientation of occupants is a factor that can be controlled by orientation of work stations Orientation of occupants is a factor that can be controlled by orientation of work stations Need typical levels and directivity to make calculations Need typical levels and directivity to make calculations

4. ASA December 2001 Microphone Array -50º +90º 15º increments

5. ASA December 2001 Measurements and Analysis Almost spherical coverage, 15 13-mm free-field condenser microphones Almost spherical coverage, 15 13-mm free-field condenser microphones Two synchronized 8-channel digital tape recorders Two synchronized 8-channel digital tape recorders 40 subjects, 20 male, 20 female 40 subjects, 20 male, 20 female 30 second L eq for each subject at each angle 30 second L eq for each subject at each angle

6. ASA December 2001 Results - A-weighted

7. ASA December 2001 Moreno et al. Horizontal plane Azimuth, degrees

8. ASA December 2001 Moreno et al. Vertical plane Elevation, degrees

9. ASA December 2001 Dunn and Farnsworth

10. ASA December 2001 McKendree NRC

11. ASA December 2001 Comparison with B&K HTS

12. ASA December 2001 Other factors Male versus female - no significant differences Male versus female - no significant differences French versus English - no significant differences French versus English - no significant differences One subject showed changes in spectrum and directivity when speaking with high, normal and low vocal effort. One subject showed changes in spectrum and directivity when speaking with high, normal and low vocal effort.

13. ASA December 2001 Summary Speech privacy all details considered Speech privacy all details considered These data allow detailed calculations to be made if so desired These data allow detailed calculations to be made if so desired