logo EDITE Helene BAHU
Helene BAHU
État académique
Thèse soutenue le 2016-12-14
Sujet: Localisation auditive en contexte de synthèse binaurale non-individuelle.
Direction de thèse:
Encadrement de thèse:
Ellipse bleue: doctorant, ellipse jaune: docteur, rectangle vert: permanent, rectangle jaune: HDR. Trait vert: encadrant de thèse, trait bleu: directeur de thèse, pointillé: jury d'évaluation à mi-parcours ou jury de thèse.
Productions scientifiques
Comparison of Different Egocentric Pointing Methods for 3D Sound Localization Experiments
International audience
This study evaluates several methods for reporting the perceived location of real sound sources. It is well known that the method used for collecting judgments in auditory-localization experiments has a strong influence on the accuracy of a subject’s response. Previous works on auditory-localization tasks revealed that egocentric pointing methods (which are based on a body-centered coordinate system) allow for more accurate judgments than verbal reporting or exocentric pointing techniques (which are based on a 2D or 3D reporting device). Three different egocentric methods are compared: the most commonly applied “manual pointing” and “head pointing” methods, and the “proximal pointing” method, which forces the participants to indicate the apparent direction by pointing in the proximal region of the head with a marker held at the fingertips. The two first methods involve a rotation of the body of the participant, whereas the third method only involves movements of the arm(s) and hand(s) with a fixed head. Sound stimuli were presented randomly over 24 loudspeakers that were uniformly distributed on the upper hemisphere around the subject. The merits of the different methods are compared and discussed with regard to localization errors and to practical considerations. Although they show similar trends, each of the different methods affects the pointing accuracy in a specific way. The proximal pointing method, for example, is more accurate for sources located at high elevation angles. However, at rear locations close to the median plane an increased bias appears due to difficulties in performing the motor task to reach these positions. The proximal pointing method shows faster response times, which may be advantageous when planning 3D sound localization experiments.
ISSN: 1610-1928 EISSN: 1861-9959 Acta Acustica united with Acustica https://hal.archives-ouvertes.fr/hal-01256849 Acta Acustica united with Acustica, Hirzel Verlag, 2016, 102 (1), pp.107 -- 118. <10.3813/AAA.918928>ARRAY(0x7fedcd370b88) 2016
Measurement of a head-related transfer function database with high spatial resolution
International audience
This paper describes a database of high spatial resolution head-related transfer functions (HRTF) measurements for 54 subjects (42 males, 12 females) and 3 dummy heads. The head-related impulse responses (HRIR) have been measured in IRCAM's anechoic chamber using the exponentional sweep sine technique and a sampling rate of 96 kHz. Microphones were positionned at the entrance of the blocked ear canal. The spatial sampling scheme is based on a Gaussian grid and includes 1680 directions with full azimuth range (0° to 360°), and elevation ranging from -51° to +86°. The angular step size is approximately 6 degrees in both dimensions. The subjects head position and orientation are tracked with an infrared optical motion capture system. The HRIR are publicly available in the standardized SOFA file format.
7th Forum Acusticum(EAA) 7th Forum Acusticum(EAA) https://hal.archives-ouvertes.fr/hal-01247583 7th Forum Acusticum(EAA), Sep 2014, Krakow, Poland. 7th Forum Acusticum(EAA), 2014, <www.fa2014.pl> www.fa2014.plARRAY(0x7fedcd3b7500) 2014-09-07
Thèse: Localisation auditive en contexte de synthèse binaurale non-individuelle
Soutenance: 2016-12-14
Rapporteurs: Etienne PARIZET    Mathieu PAQUIER