There's many cues. We studied two obvious that are directly related to the anatomy of the speaker: glottal-pulse rate and vocal-tract length. There's many papers on the topic from Patterson's lab (http://www.pdn.cam.ac.uk/groups/cnbh/research/publications/). One that may directly answer your question is:
Gaudrain, Etienne, S Li, VS Ban, and RD Patterson. “The Role of Glottal Pulse Rate and Vocal Tract Length in the Perception of Speaker Identity.” Interspeech 2009: 10th Annual Conference of the International Speech Communication Association 1-5 (2009): 152–155.
On 14/11/2012 09:05, Siping Tao wrote:
-- Etienne Gaudrain, PhD UMCG, Afdeling KNO BB20 PO Box 30.001 9700 RB Groningen Netherlands Room P3.236 Phone +31 5036 13290 Skype egaudrain Note: emails to this address are limited to 10 MB. To send larger attachments, please use egaudrain.cam@xxxxxxxxx.