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Replication of human head movements in 3 dimensions by a mechanical joint

 
: Heß, Wolfgang; Weishäupl, Julia

Habets, Emanuël ; Verband Deutscher Tonmeister -VDT-:
International Conference on Spatial Audio, ICSA 2014. Proceedings : Erlangen, Germany; February 21 - 23, 2014
Detmold: Verlag VDT, 2014
ISBN: 978-3-9812830-4-4
Art. 39, 8 pp.
International Conference on Spatial Audio (ICSA) <2, 2014, Erlangen>
English
Conference Paper
Fraunhofer IIS ()
Robotik; Hardware; Audio Analyse

Abstract
Listeners in 3D sound systems frequently focus on sounds coming from vertical positions deviating from the horizontal plane by moving their viewing direction towards them. Additionally, binaural room-impulse response measurements in small rooms like car cabins require an averaging of measurements at multiple positions to overcome comb-filter effects, caused by sound reflections at surrounding surfaces. For these purposes, in the project depicted here a mechatronic construction was developed to carry out head movements in the three rotatory degrees of freedom yaw (azimuth), pitch (frontal elevation) and roll (lateral elevation) by a dummy head. The kinematic system simulates head and neck movements as close as possible to real human movements in the 3 rotational degrees of freedom. Thereby the human neck’s 7 cervicals are represented by a mechanical compression spring which allows a range of motion of ±30° for pitch and roll. Four stepper motors are used to tilt a base board holding the dummy head in which two microphones in the ear-canals are incorporated for binaural measurements. This construction is placed on a rotatory actuator, a combination of stepper motor and turntable. For the rotation in the horizontal plane a full turn would be possible, however it is limited by software to ±90°. The whole system is integrated into a human torso which guarantees that shoulder reflections are taken into account while processing acoustic measurements. The construction’s accurateness is <1° in the horizontal plane and 2° for the tilt angles.

: http://publica.fraunhofer.de/documents/N-326113.html