DEVELOPMENT OF A HUMAN HEAD SIMULATOR FOR STUDYING THE SPEECH TRANSMISSION QUALITIES OF PROTECTIVE MASKS AND TRANSDUCER SYSTEMS

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Authors
  1. Kunov, H.
  2. Racansky, D.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Toronto Univ, Toronto ONT (CAN) Inst of Biomedical Engineering
Abstract
There is a need for an accurate acousto-mechanical simulator of the human head which can reproduce the breath and voice patterns corresponding to different vocal efforts. Such an instrument can be used in the objective evaluation of the speech transmission through respirators, flight helmets, and other masks, and in assessing speech communication devices in high noise environments. The report deals with the design of a human head simulator. Anthropometric data on human heads are reviewed, and the means available to evaluate the appropriateness of manufactured head forms are discussed. Computer aided design lends itself logically to the task of designing and modifying the head shape. We describe the use of the CATIA CAD package. With the shape created electronially, it is possible to manufacture it on numerically controlled machines. We describe the manufacture of a simple ellipsoid test structure, followed by a head-like structure. We describe a set of experiments in which a number of subjects were measured with a mechanical impedance probe. Complex impedance as a function of frequency was obtained over an extended frequency range for a number of points on the head in all subjects. The fabrication of artificial skin/soft tissue poses a special challenge, and some solutions are presented. TRUNCATED
Keywords
Waveform generators;Speech representation
Date of publication
01 Sep 1988
Number of Pages
155
DSTKIM No
97-00623
CANDIS No
500891
Format(s):
Hardcopy;Document Image stored on Optical Disk

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